Katsuki Bakugo/Synopsis

History
Katsuki Bakugo grew up in the same neighborhood as Izuku Midoriya since they were young children. Izuku and Katsuki's other childhood friends gave him the nickname "Kacchan". Izuku and the other boys always looked up to Katsuki because of his energy, confidence and natural born talent. Because of this praise, Katsuki developed a rather arrogant and self-inflated view of him and would often picked on Izuku and gave him the nickname "Deku".

Katsuki always admired All Might when he was young because the number one hero would always win against the odds. While watching a video of him at the electronics store, Katsuki tells his friends that All Might is the greatest hero because of his ability to achieve victory. Sometime later, Katsuki defeated a few fourth graders who bumped into him. With Izuku looking on, Katsuki says that the most amazing hero always wins no matter what.

Once Katsuki developed his Quirk, his aggressive tendencies transformed into heinous bullying. He was constantly praised for his powerful Quirk and developed a twisted superiority complex as a young child. Believing himself to be better then everyone else, Katsuki looked down on Izuku especially because he lacked a Quirk all together.

Despite this, Izuku still considered the two of them to be friends at the time, but things escalated when Izuku tried to help Katsuki after he fell off a small bridge into a stream. Izuku offered a helping hand, but Katsuki's pride caused him to take this an insult. He believed that Izuku made him appear as if he needed aid from someone who is beneath him. This would strain the relationship between the two for years to come.

Entrance Exam Arc
During class at Orudera Junior High school, the teacher announces that all students will graduate, and Katsuki contends the notion that he is of the same status as his peers. He refers to his classmates as beneath him and tells them all that he alone will attend U.A. High and surpass the number one hero: All Might.

The teacher discloses that Izuku is also attempting to get into U.A., much to Katsuki's displeasure. Katsuki berates Izuku and uses his Quirk to scare him by exploding his desk. He tells Izuku that because he is Quirkless, he will never succeed at anything, especially getting into U.A.

Katsuki and two of his friends confront Izuku after class. They take his hero notebook and Katsuki burns it before tossing it out the window into a fish pond. Katsuki reminds Izuku that only he himself is destined to reach that school and Izuku is just a stepping stone for his greatness. Before leaving the room, Katsuki warns Izuku not to apply to U.A. at all.

After school, Katsuki and company try to decide what to do for fun and ponder if Katsuki was too harsh on Izuku. Katsuki ignores them, only replying that he cannot stand Izuku's optimism and someone needs to teach him how the world works. The boys suggest they skip class and go to the arcade but Katsuki refuses because it could ruin his chances of getting into U.A.

Just then, the Sludge Villain captures Katsuki and goes on a rampage through the city. Katsuki tries to break free using his Quirk, but is unable to, only setting fire to the area around him and making it more difficult for heroes to intervene.

As people and Heroes are watching, unable to help Katsuki, Izuku rushes to help him. While Katsuki demands to know why Izuku is helping him, Izuku states that he could not stand by and let Katsuki die. The two are ultimately saved by All Might, who destroys the villain while freeing Katsuki at the same time.

Afterward, Izuku is scolded for his recklessness and Katsuki is praised for his Quirk, but the latter only frowns at him in silence. Later, he finds Izuku and yells at him for trying to help. Katsuki claims he was fine on his own and he may owe him but he was never going to apologize for his previous action and voiced he didn't need any help before angrily storming away.

Months later, Katsuki arrives to take part in the U.A. Entrance Exam. While walking in, Katsuki notices Izuku walking in and tells him to move out of the way. Later in the auditorium, Katsuki is seated next to Izuku, whom he has to tell to shut up after he starts geeking out over Present Mic being the examiner. Katsuki is also upset by the fact that he and Izuku must participate in separate areas because Katsuki was excited to crush him.

After the exam begins, judges note that Katsuki took on the exam using brute force and combat ability. By the test's end, Katsuki scored seventy-seven combat points, the most out of any participant. He also received the lowest amount of rescue points, as he was the only student not to get any rescue points at all. Examiners were still impressed by his performance. They made note of how he remained calm after the zero giant Villain-Bot arrived and took out the smaller bots with ease.

Quirk Apprehension Test Arc
At the end of Orudera's academic year, Katsuki and Izuku are praised by their teacher for being the only two students in school history to get accepted into U.A. Katsuki angrily confronted Izuku and demanded to know what trick Izuku used to pass the exam. Katsuki wanted to be the only one from their school to attend U.A. and threatens for Izuku to change schools. However, Izuku stands up to Katsuki for the first time by refusing to withdraw, claiming that he now has someone who believes in him and he won't let them down.

April arrives and the U.A. academic year begins. On the very first day, Katsuki argued with Tenya Iida about having his feet on the desk. Iida tries to introduce himself calmly, but Katsuki recognizes him as just another stepping stone and threatens to crush him. Their disagreement is ended when they see Izuku entering (with him being shocked both are his classmates). Very soon, the teacher Shota Aizawa arrives and takes them out to the P.E. field for a quirk assessment test.

Shota Aizawa uses Katsuki as an example to explain the test. Throughout middle school, physical tests were always given without quirks in mind. This led to Katsuki only throwing about sixty-five meters on his original ball toss. This time, Katsuki uses his Quirk to throw the ball and his explosive toss sends the ball over seven hundred meters.

The class goes through several different physical tests, including a fifty-meter dash and a standing long jump. Katsuki uses his quirk to excel in both and claims that his quirk is the most versatile in the class.

When Izuku takes the pitching test, Katsuki mocks him for being powerless but is shocked when Izuku uses a Quirk to toss the ball as far as he did. Katsuki questioned why Izuku never got his Quirk as a kid and angrily tried to attack Izuku for an explanation, but Shota stops him from doing so using his Quirk and capture weapon.

Battle Trial Arc
The next day at school during Hero Basic Training, Katsuki and the other students suit up in their hero costumes for combat training. Katsuki is teamed with Tenya Iida on Team D and must face off with Team A, consisting of Izuku Midoriya and Ochaco Uraraka. Team D are assigned the villainous mission protect a warhead inside a building. Team A is assigned the task of stopping the villains by capturing the payload or the villains themselves.

As combat training begins, Katsuki still ponders over Izuku's Quirk and started to get angry as he believed Izuku was intentionally hiding his abilities from him for years and was playing him. He goes off his own and attempts to ambush Izuku and Ochaco. Izuku evades and saves Ochaco even though Katsuki manages to burn off his mask.

Katsuki tries to attack Izuku again, but he is countered and slammed to the ground by the latter. Izuku reveals to the surprised Katsuki that the same notebook Katsuki previously burned and threw out had notes about Katsuki's moves along with other heroes, which he memorized and knew ways to counter them. Finally standing his ground to Katsuki, Izuku tells him that he is no longer the same kid Katsuki used to bully and the name "Deku" would be a hero name, as Katsuki is angered at his declaration.

Katsuki attacks again but his moves are countered once more and he is nearly caught by the Capturing Weapon but breaks free. Then Izuku retreats, forcing Katsuki to search the building alone, giving Uraraka a chance to escape and find Tenya. Tenya tries to contact Katsuki, but he is too focused on attacking Izuku that he ignores him.

Katsuki eventually finds Izuku, demanding he use his quirk while revealing information about his own. He explains that his Explosion Quirk works by detonating the nitroglycerin he sweats. The gauntlets on his costume store this "nitro-sweat", and once they're full Katsuki can fire off a huge blast.

All Might cautions him not to use the attack, but Katsuki does so anyway though he minimizes the damage. Izuku narrowly evades and the blast destroys a large portion of the building. All Might warns Katsuki should he use that attack again, his team will be disqualified.

Katsuki takes the duel into close quarters, where he easily dominates Izuku in combat while berating him. He uses his explosions to change his trajectory in the air and blast Izuku from behind. Then he grabs onto Izuku's arm and slams him into the ground after using explosions from his free hand to build up momentum. Katsuki's fighting style garners him commendation as a villain from his peers watching alongside All Might though they note he's going too far.

Katsuki again demands that Izuku use his quirk and questions whether Izuku feels he is too good for him now. This irritates Izuku, who expresses that he has always felt Katsuki was better, and that's why he wants to beat him.

Filled with emotion, both fighters rush each other for a final clash as Izuku uses his quirk which delights Katsuki as he moves to attack. Knowing he cannot defeat Katsuki at close range, Izuku alerts Ochaco and uses his Quirk to smash the ceilings from every building story above him. The shockwave creates enough debris for Ochaco to use on the floor above. She uses her Quirk to float debris and sends them flying at Tenya, then uses the opening to grab the weapon and secure the victory for Team A.

In disbelief at his loss, Katsuki begins to panic and hyperventilate at the idea of losing to Izuku for once. He is soon calmed and consoled by All Might, who tells Katsuki that it does not matter whether he won or lost, but that he takes a look back to reflect on his experience and learn from it. All Might leads Katsuki back to the monitoring room with the rest of the class where they critique the match. Momo Yaoyorozu comments that Katsuki's attack was far too foolish for the exercise, to which All Might agrees while Katsuki sulks. Katsuki watches the next match between Team B and Team I. He is visibly stunned by Shoto Todoroki's incredible Quirk and starts to ponder if he really is the best after seeing that amazing power.

After all the Battle Trial's are completed and the school day is done, Katsuki storms out of the school but is closely followed by Izuku. Once he catches up, Katsuki asks if he will gloat but Izuku reveals that he hasn't been deceiving Katsuki about his Quirk. Izuku goes on to reveal that he got his Quirk from someone else and can't yet control it, but Katsuki refuses to believe that as the whole thing sounded ridiculous.

In response, Katsuki admits his failure and inferiority to others even admitting to agreeing with Momo and acknowledges he can't defeat Shoto in a head to head fight. His pride has been damaged, but Katsuki declares that he will never lose again and will follow his dreams to become the best. All Might arrives and tries to console Katsuki again, but this time Katsuki tells him off and promises to surpass the number one hero without his help.

Unforeseen Simulation Joint Arc
The next day of school, reporters looking for an interview from All Might recognize Katsuki. They ask if he's the victim from the Sludge Villain insident but he only responds by warning them to walk away.

In Class 1-A's homeroom, Mister Aizawa criticizes Katsuki's performance during combat training. He says Katsuki has talent and tells him not to sulk over his defeat. Next, Aizawa asks the class to choose a president. Katsuki tries to get himself elected, but ends up losing out to Izuku. Irritated, Katsuki demands to know who voted for him.

During Hero Basic Training Class, Aizawa informs the class that they will undergo yet another training exercise. However, this time it will be rescue training held at an outside facility. The students suit up in their costumes and head out on a bus to the training area. Katsuki is teased by his classmates on the ride there. Denki Kaminari and Tsuyu Asui both comment on Katsuki's repulsive attitude, outraging him.

When the students arrive at the facility, Rescue Hero Thirteen greets them. Katsuki listens to his explanation on how he built the facility and it is named the Unforeseen Simulation Joint. He goes on to lecture the students about using their powers to save people, but is ultimately interrupted by the arrival of several villains.

Aizawa orders the class to evacuate with Thirteen, but they're cut off by an ominous villain using his warping Quirk. He introduces himself as Kurogiri of the League of villains. Katsuki and Eijiro hastily attack the villain, but their attacks don't affect his intangible body. Kurogiri counters by using his Quirk to separate the class into the many different simulation zones. Katsuki ends up with Eijiro in the Ruins Zone.

Together, Katsuki and Eijiro easily defeat the villains trying to ambush them in the Ruins Zone. While discussing what to do next, they disagree on their next course of action. Katsuki wants to defeat Kurogiri and cut off the villains escape route while Eijiro desires to save his classmates.

A villain tries to take Katsuki by surprise, but he swiftly counters and routs the villain. He reassures Eijiro that their peers can handle themselves against the weak criminals. Eijiro is impressed by Katsuki's calm demeanor, but this only angers Katsuki who claims he's always that way. Eijiro continues by stating that perhaps Katsuki is saying to have faith in their peers, and decides to accompany Katsuki's search for Kurogiri.

They arrive at the central plaza just in time to save the day. Kurogiri almost warps Izuku away, but Katsuki swoops in and blasts the villain while yelling for Izuku to get out of his way. Katsuki pins Kurogiri down by his neck armor and explains that he's already discovered the villain's weakness. Kurogiri's body is not fully intangible, he hides his physical form under the black smoke from his Quirk.

By aiming his attack at Kurogiri's neck armor, Katsuki was able to exploit his weakness. He warns the villain not to move, or else he will blow him to pieces. Tomura Shigaraki orders Nomu to free Kurogiri, and Katsuki is not fast enough to react to Nomu. He is saved when All Might takes the brunt of Nomu's attack, but Kurogiri is freed as a result. Katsuki watches the ensuing battle in awe, where All Might uses his incredible power to defeat Nomu.

Katsuki comments on how intense the situation is an decides to remove himself from the rest of the fight. However, Izuku rushes to All Might's side. Katsuki notices the incredible speed Izuku uses to confront the villains. Izuku and All Might are saved when Tenya returns to the U.S.J. with Pro Heroes as reinforcements. Katsuki is then instructed to leave with the rest of the class and they meet outside the facility. Katsuki continues to wonder about Izuku's Quirk, but is abruptly told by Eijiro to return with the class to school.

U.A. Sports Festival Arc
Two days after the attack on the U.S.J., Katsuki and his classmates return to school and talk about the attack. Minoru Mineta complains about his fear and Katsuki responds by insulting him and telling him to shut up. After Mister Aizawa returns to class, Katsuki and his peers lectured about the importance of the upcoming U.A. Sports Festival. At the end of the day, Katsuki confronts a mob of students blocking Class 1-A's exit. Katsuki realizes these students must be there to scout their competition for the festival because Class 1-A survived a real villain attack.

He tells the crowd that he is a real future pro for them to move aside, calling them extras. Katsuki is approached by Hitoshi Shinso, who says that although some students may be scouting, he is there to declare war on them. Another student, this time from the other hero course, yells at Katsuki for being arrogant but Katsuki ignores him and walks away. Eijiro says Katsuki can't leave after making everyone hate Class 1-A. Katsuki does so anyway, saying that the people don't matter and the only thing that's important is that he defeats them all.

For the next two weeks before the festival, Katsuki trains at the Replica City District. When the day of the U.A. Sports Festival arrives, Katsuki changes into his P.E. clothes and prepares with his class in their designated waiting room. Like the rest of his peers, Katsuki overheard Shoto Todoroki challenge Izuku Midoriya. Katsuki takes exception to this because he feels as if Shoto is declaring war on the wrong person.

Before the festival begins, First Year Chief Referee: Midnight calls Katsuki to the stage to lead the pledge. Instead, he simply announces that he will win the games, angering his fellow competitors and generates boos from the crowd. Midnight announces the preliminaries will be an Obstacle Race four kilometers around the stadium, which immediately begins after the rules are explained. Shoto gets out to an early lead by freezing the stadium's exit, but Katsuki avoids the ice by using his explosions to propel himself past them.

Using his explosions to move through the air, Katsuki flies overtop the villain-bot blockade. He is followed close behind by Hanta Sero and Fumikage Tokoyami. Hanta comments that he expected Katsuki to try and blast through the blockade, and is impressed by Katsuki's strategy. Katsuki reaches the next obstacle soon after: The Fall, a canyon laced with tightropes. Katsuki avoids using the tightropes all together by flying over the canyon completely. After Shoto reaches final leg of the race: the Mine Field and is forced to slow down, Katsuki finally catches up to him.

Katsuki yells at Shoto for declaring war on the wrong rival, and the two engage in combat as they run for first place. Then suddenly, a giant explosion goes off, propelling Izuku past both of them. Although Katsuki and Shoto momentarily catch back up, Izuku uses a second explosion to stop them for just enough time to cross the finish line first. Katsuki crosses the finish line after Shoto, placing him in third. Katsuki is enraged after losing to Izuku again, but he qualifies for the second round: The Cavalry Battle.

While Midnight explains the rules of the Cavalry Battle, she notes that anyone who knocks other teams down will be disqualified, irritating Katsuki. Having placed third in the Obstacle Race, Katsuki is worth two hundred points for the Calvary Battle.

While everyone scrambles to make teams for the second round event, many students from Class 1-A try to convince Katsuki to form a team with them. However, he is unable to recall their names or their Quirk's, making them comment negatively on his ego. Then Eijiro Kirishima asks to join but Katsuki forgets his name as well and greets him as dumb hair. After correcting him and pointing out his spiky hair, Eijiro pitches his Quirk's compatibility to Katsuki's. Katsuki says he needs someone with guts and Eijiro replies that they should go after Izuku's ten million points together, exciting Katsuki.

Team Bakugo is formed with Katsuki as the rider and Mina Ashido, Hanta Sero and Eijiro as his horses. After the Cavalry Battle begins, Katsuki flies through the air and tries to attack Team Midoriya, who are flying using a jet pack and Ochaco's Quirk. Katsuki nearly blasts the team, but he's blocked by Fumikage Tokoyami's Dark Shadow Quirk. Unfamiliar with Fumikage, Katsuki is frustrated as he asks what his dark shadow is. Katsuki falls out of the air, but is caught by Hanta's Tape Quirk.

Soon after, Katsuki's headband is stolen by Neito Monoma from Class 1-B. Neito takes a moment to explain that Class 1-B purposely placed low in the Obstacle Race to scout their Class 1-A Rivals, calling them fools for obsessing for winning over the preliminaries. He continues to taunt Katsuki by recognizing him as the victim from the sludge villain incident. Now absolutely livid, Katsuki explains that his team has a new agenda: to annihilate Team Monoma before they go after Izuku.

Katsuki attacks Neito, but the latter evades and then counters using an explosion of his own. When Katsuki tries to blast him again, Neito uses Eijiro's hardening power to block it. This forces Katsuki to realize that Neito's Quirk is the ability to copy other Quirks. When Katsuki tries to attack again, his team is immobilized by Neito's classmate: Kojiro Bonto. As Team Monoma runs away, Neito takes a moment to taunt Katsuki over his address at the opening ceremony for the festival. This infuriates Katsuki, but his determination to win remains steadfast.

Mina uses her Quirk to free the team and Katsuki uses an explosion to propel himself at Team Monoma. One of their members: Kosei Tsuburaba uses his Solid Air Quirk to repel Katsuki, but only for a few moments. Katsuki punches through the air shield and grabs two of the headbands around Neito's neck as he tries to flee, then Hanta recovers Katsuki using his Tape Quirk. Undeterred by his team's elevation into second place, Katsuki orders his team to continue pursuing Neito. Katsuki claims that he will go after Izuku's ten million points after they recover the headband Neito stole from them.

Katsuki strategically uses his teammates Quirk's to close the distance between the two teams. Kosei tries to stop him, but Katsuki blasts through the air shield and takes Neito's last headband. All Might is impressed that Katsuki understands a truth that no one needed to teach him: "there's a difference between those who aim for the top and those who settle, and that difference matters". Mister Aizawa comments that although Class 1-B had a good strategy, they failed to take Katsuki's "overwhelming tenacity" into account. Even after securing more than enough points to advance, Katsuki urges his team to go after the Izuku's team.

With only seconds remaining, Katsuki's team joins the fray already brewing between Team Midoriya and Team Todoroki. Katsuki notices that Team Todoroki has secured the ten million points, and damns Shoto for it. Katsuki tries to go after Shoto, but time runs out. Despite placing second in the event and moving onto the finals, Katsuki is extremely frustrated after failing to be the undeniable champion of the round.

During the lunch break, Katsuki secretly eavesdrops on Shoto's conversation with Izuku in the student entrance corridor. Shoto explains that his father created him to usurp All Might, and he plans to win the festival without using his father's power. Katsuki leaves after Izuku replies that he will do his best to defeat Shoto.

Midnight reveals that the finals will be a one on one fighting tournament and everyone draws lots for their matchups. Katsuki is set to face Ochaco Uraraka, but he fails to recognize her name and questions who she might be.

Katsuki watches the first match between Izuku and Hitoshi Shinso. He becomes nostalgic when Izuku wins using the same shoulder throw he used during the Battle Trial. Denki reminds him of this, Katsuki tells "Sparky" to shut his mouth.

Seven matches later, Katsuki takes to the ring to face his opponent: Ochaco Uraraka. He warns "pink cheeks" to withdraw from the match because he isn't going to hold anything back. She refuses and starts the engagement by rushing Katsuki. He immediately blows her away with an explosion and repeats that she should've dropped out of the tournament. He blasts her again, only to realize he's exploded only her jacket. She threw it through the smoke as a distraction and nearly gets the drop on Katsuki. Thanks to his incredible reaction time, he's able to blast Ochaco away before she can touch him and use her Quirk to send him out of bounds.

Ochaco continues to rush Katsuki over and over again, and although Katsuki continues to blast her repeatedly, she continues her assault without resting between attacks. The crowd starts to boo Katsuki for being too rough, but Aizawa calls out the man who starts the uproar. He explains that Katsuki's fierceness is an acknowledgement of his opponent's strength, and he's simply doing everything he can to keep Ochaco at bay so he can come out on top.

As the smoke clears from all the explosions, Ochaco remains undeterred, still standing from Katsuki's barrage. Katsuki keeps his guard up, uneasy that Ochaco "isn't dead yet". This time, rather then dashes at him, Ochaco thanks Katsuki for keeping his focus on her. Confused, Katsuki glances up to see a great amount of debris floating high above them. Ochaco kept low to the ground as she moved so that Katsuki's explosions tore up the floor of the ring, creating weapons for her. Then she kept him focused on her by attacking relentlessly, rendering Katsuki oblivious to the impending meteor shower.

As she releases her Quirk, causing all the debris to fall down towards Katsuki, Ochaco rushes at him to try and capitalize on an opening. Without any other choice, Katsuki unleashes a large, powerful explosion that repels all the debris, horrifying his opponent as she gets blown away as well.

Katsuki figured Ochaco would have some sort of plan since he now remembered her as being friends with Izuku, and quietly states to himself that this was a close call. Katsuki rushes Ochaco, claiming it is time to get serious. She tries to stand up and fight, but ends up collapsing. He keeps his guard up even as she crawls towards him, but Ochaco ultimately falls unconscious and Katsuki is declared the winner.

On his way to the student section, Katsuki happens upon Izuku in the hallway and is immediately irritated by his presence. He accuses Izuku of providing Ochaco with her "annoying" strategy, but Izuku angrily denies it and says that if the battle was harder than Katsuki had anticipated, then it is because of Ochaco's own plan and not his. Katsuki eventually makes his way back to the stands with his classmates, who tease him for playing the villain in his fight. He angrily tells them to shut up, and Denki comments in disbelief that Katsuki would aim a powerful explosion at a fragile girl. Katsuki sits down and replies that he most definitely would not label Ochaco as frail.

As the match between Izuku and Shoto begins, Eijiro returns from his victory to sit down with his class. Eijiro tells Katsuki that they will fight next, to which Katsuki replies that he'll kill him. Eijiro laughs it off and then sarcastically says it must be nice that Katsuki and Shoto can use attacks that blast the entire stadium. Hanta adds that they also do not need to pause between attacks.

Katsuki calls them morons and explains that just like sprinting drains your breath, Quirks can be worn out because they are physical abilities too. Then Katsuki thinks to himself about his own limits and muses over that he designed his costume so that he could fire off stronger blasts then his body normally allows him to.

Continuing to watch the battle between Izuku and Shoto closely, Katsuki notes that Shoto's movements have become sloppy and assumes the reason behind it is because all the frost forming on his body. Katsuki compares Shoto's Quirk to that of a video game's MP meter. When the match ends, Katsuki is taken back by Izuku's defeat.

As the second round proceeds, Katsuki faces Eijiro in his next match. Katsuki and Eijiro trade blows, but Eijiro's hardened body dampens Katsuki's Explosions while Katsuki's cheek is cut open by Eijiro's hardened punch. Katsuki is forced on the defensive because of Eijiro's defensive abilities, but is eventually able to injure Eijiro after landing a few more explosions.

Katsuki realizes that Eijiro's Hardening weakens through continuous strikes and takes advantage of that by barraging him with a series of explosions. Eijiro's defense eventually gives way and he is knocked unconscious by Katsuki's final blast.

In his semi-final matchup, Katsuki duels with Fumikage Tokoyami. He comments that Fumikage's Dark Shadow is annoying and continues to brutalize it using his explosions. Fumikage is forced completely on the defensive as Katsuki's attacks continue to get faster, not giving his opponent any room to counter attack.

After striking Dark Shadow with an explosion in mid-air, Fumikage orders it to grab Katsuki, but he evades and jumps behind them. Then Katsuki uses his stun grenade technique to flood the arena with light and pins down Fumikage by exploiting his weakness. Fumikage asks if Katsuki knew his weakness all along, to which Katsuki replies he learned by attacking over and over again. Katsuki admits it was an unfair match up for Fumikage and tells him that he's finished. Fumikage surrenders and Katsuki proceeds to the finals to face Shoto Todoroki.

Katsuki accidentally barges into the wrong waiting room and finds Shoto there. He yells at Shoto for being in the waiting room until he realizes that he's actually entered the wrong room. Shoto doesn't pay Katsuki any mind, much to his irritation. He uses a small explosion to try and intimidate Shoto, saying that he better bring his best to their upcoming bout. Shoto replies that Izuku told him the same thing, and then asks if he was so helpful during their childhood. This greatly annoys Katsuki, who kicks over the table and yells for Shoto to ignore Izuku and his family issues so that he can use his fire during their battle. Katsuki angrily exits the room and states he wants to everyone to know he can beat Shoto at full strength. While walking through the hallway Katsuki muses over the thought of bombing the entire stadium in the finals.

The U.A. Sports Festival's finale between Katsuki and Shoto begins soon after. Shoto opens the fight with a large scale ice attack. At first it appears that Katsuki is frozen inside the icy prison, but he endures it by blasting through the ice with his explosions. After freeing himself from the frozen prison, Katsuki says Shoto has powerful attacks, but he also has bad aim and needs to try harder. He rushes Shoto, who attempts to touch him with his right side, but Katsuki uses a small explosion in mid-air to avoid being frozen. Katsuki grabs on to Shoto's left side and throws him away. Shoto recovers by creating a wave of ice that he surfs and sends towards his opponent.

Katsuki tries to blast Shoto, but he avoids and grabs onto Katsuki's arm using his left hand. Instead of burning Katsuki, Shoto simply tosses him away. This only annoys Katsuki, who questions if Shoto feels he's unworthy of his flames. He continues, threatening to kill Shoto and berates him for not giving their match his best. Katsuki demands Shoto use his fire so that he can defeat him at his best and prove that beyond a shadow of a doubt that he is the strongest student at the festival.

Shoto mulls over his words until suddenly Izuku starts cheering for him from the crowd. Katsuki notices and comments that Izuku is a stupid nerd before propelling himself in the air. Encouraged by Izuku, Shoto ignites his flames, exciting Katsuki. To counter, Katsuki decides to use his special move: Howitzer Impact. He begins his attack by using small explosions to propel himself in a circular motion and create a twister that surrounds him. However, just as the two superpowers are about to clash, Shoto extinguishes his flames and exposes himself to Katsuki's large scale explosion.

When the smoke clears, Katsuki realizes Shoto did not actually use his fire and has been blasted outside the ring. Unsatisfied, Katsuki runs over to Shoto even though he's unconscious and furiously demands that he get back up because a victory in this manner is meaningless to him. Midnight uses her Quirk to knock Katsuki out and declares him the victor of the battle and first year champion of the U.A. Sports Festival.

When Katsuki awakens he goes ballistic with fury, still angry with Shoto for basically throwing their match. He has to be restrained, muzzled and chained to the champions podium  during the closing ceremony for the festival. All Might removes the restraint mask on his face before congratulating him on foreshadowing his victory during the opening ceremony. He notices Katsuki's face is scary thanks to his undeniable rage and tries to give him the gold medal. Katsuki refuses and tells All Might to get that "garbage" away from him because he still hasn't proved he's the best. All Might tries to encourage Katsuki to accept the medal even if it's just as a scar. Katsuki still refuses, so All Might forces it in his mouth.

After the Sports Festival concludes, Class 1-A returns to their homeroom class, where Aizawa grants them the next two days off. Katsuki is still visually upset with the way he's won. Katsuki remains fuming even until the next day, where he wakes up at noon and angrily brushes his teeth, yelling for his mouth germs to die as his mother shouts at him to stop being loud.

Vs. Hero Killer Arc
Katsuki returns to class two days after the Sports Festival. Mister Aizawa teaches them about Hero Informatics and reveals the draft results prior to the festival. Katsuki received 3,556 offers from Pro Heroes, second highest in the class behind only Shoto. Denki comments that this is because Pros may have been reluctant to send nominations to a student who needed to be chained up at the end of the festival. Katsuki angrily replies that if a Pro was scared away, than they are just weak.

Midnight joins the class to help them select hero names for their upcoming internships. Initially Katsuki tries to choose King Explosion Murder (爆殺王), but Midnight says it's too violent. While Katsuki re-writes his code name, he notices Izuku chooses Deku as his moniker and is annoyed. Once everyone else is finished presenting Katsuki changes his alias to Lord Explosion Murder (爆殺卿) and Midnight comments that it's basically the same as before.

At lunch time, Katsuki finds himself irritated while listening to the class discuss Izuku's workout regiment. When first day of the internships arrive, Katsuki receives his costume and boards a train to Best Jeanist's agency.

When Katsuki arrives at Best Jeanist's office in Tokyo, Best Jeanist admits that he isn't very fond of Katsuki because of his attitude despite being talented enough to take on as a sidekick. Katsuki is irritated by the Number 4 Hero's lecture and tries to approach him, forcing the Pro to restrain him using his Quirk. Best Jeanist continues, stating that he will transform Katsuki into an exemplary hero by the end of their time together.

The next day, Best Jeanist scolds Katsuki on the importance of a hero maintaining an elegant appearance. He styles Katsuki's hair similarly to his own, prompting Katsuki to regret choosing his agency.

After Stain's defeat is published, Best Jeanist explains that the Hosu City incident is all over the news, but reminds Katsuki and his sidekicks that they must remain calm and collected. While Best Jeanist tells everyone that everything will run smoothly as normal, Katsuki mulls over his poor choice of an internship.

Sometime during the internship, Katsuki goes out on patrol with Best Jeanist. He asks Katsuki the importance of patrolling, to which he answers so that they can find and beat up villains easier. Best Jeanist says this answer is wrong and corrects him. Patrols are to show the public who heroes are and give them peace of mind. Then, a few small children recognize Katsuki from what he believes to be the Sports Festival. However, they actually recall him from the Sludge Villain incident. This angers Katsuki, who yells at the kids and makes them cry. Best Jeanist asks Katsuki to deal with them properly, but Katsuki ends up intimidating them further.

The internship concludes at the end of the Week and Katsuki returns to U.A. High. His first day back he is immediately met by Eijiro and Hanta hysterically laughing and making fun of his new haircut. Embarrassed, Katsuki lashes out at them in anger and his hair returns to normal.

During Basic Hero Training, Katsuki immediately declares Izuku will lose but watches the Rescue Training Race and notices Izuku's new abilities are copies of his own movements. Katsuki is greatly shocked and irritated that Izuku improved a great deal while he was stuck wasting his time with Best Jeanist.

Final Exams Arc
One week prior to Final Exams, Eijiro notes that Momo is being virtuous in her studies and suggests that he may join her. Katsuki who came in third in mid-term grades, angrily asks if Eijiro wants him to beat the lessons into his head, as Eijiro states he's counting on it. After lunch, Katsuki overhears Denki and Mina talking about how the practical portion of the finals consists of fighting robotic villains. Katsuki believes they're far too excited and yells at them both, telling them he'd destroy whatever was in the way and they needed to learn to control their Quirks as the scared duo note he is right.

Katsuki turns his attention to Izuku and states that the way the latter is using his Quirk now is pissing him off. Ochaco figures that Katsuki is referring to Izuku's movements, during the rescue training race and how they matched Katsuki's own. Katsuki claims that he doesn't want an empty victory like the U.A. Sports Festival, and says that their personal grades in the upcoming finals will determine their status. Katsuki declares he will the best as he threatens to defeat Shoto as well before he storms out of class. Eijiro notes that Katsuki hasn't been so intense in a while, and Fumikage replies that impatience and hatred have gotten the better of him. As Katsuki walks through the school corridors, Aizawa notes that Katsuki is getting worse.

In the days leading up to final exams, Katsuki helps Eijiro study. After completing the written portion of the exams, Katsuki and his class meet at the training grounds in their costumes for the practical portion. There, Class 1-A meets with the teachers and Principal Nezu explains that the practical has been changed from fighting robotic villains to being paired together and facing off with one of the teachers. Katsuki is shocked to find out that he and Izuku have been paired together against All Might in the tenth and final match.

Principal Nezu goes on to explain that students can either escape or handcuff their teacher to pass the exam within thirty minutes. All Might adds that the teachers will wear high-density weights to give the students a handicap. Katsuki claims that the teachers are underestimating the students but All Might replies that they will see during their battle. Aizawa dismisses the students, and Katsuki shuns Izuku to wait for their battle alone.

When the time arrives for their match, Katsuki tries to ignore Izuku while walking through the replica city. Izuku pleads with Katsuki to consider escaping rather than fighting All Might. Katsuki refutes him and says that he will beat All Might himself. Izuku replies that it isn't possible, angering Katsuki enough for him to hit Izuku and demand he stops speaking. Izuku says he's trying to communicate so they can pass, but Katsuki replies that Izuku's power isn't needed in this battle. They begin yelling at each other but are interrupted when a shockwave sent by All Might decimates the city street.

Katsuki notices All Might's malicious presence and notes how intimidating it is. Izuku wishes to run, but despite this Katsuki decides to stand his ground. He uses Stun Grenade to blind All Might but the hero resists and grabs Katsuki's face. Katsuki counterattacks with small consecutive explosions that don't appear to harm All Might and he slams Katsuki into the ground. When he recovers, Katsuki tries to rush All Might but ends up crashing into a fleeing Izuku. After the recoil, Izuku tells Katsuki they need to retreat and Katsuki replies that he will win because that's what heroes do. This prompts Izuku to remember their childhood and how Katsuki admired All Might as a hero because he always won in the end regardless of the situation.

Izuku continues his pleas to no avail and then suddenly All Might pins down Izuku using a guardrail before sending Katsuki flying with a punch powerful enough to make him vomit. All Might approaches Katsuki and says he understands Katsuki's anger is because of Izuku's sudden growth. He continues, saying that Katsuki is stifling his own potential but Katsuki interrupts and says that if he has to work with Izuku, then he'd rather lose. Disappointed with his students reply, All Might prepares to finish him off. Izuku swiftly comes to the rescue and punches Katsuki away, telling him not to say he'd rather lose. Izuku carries Katsuki away down an alleyway until Katsuki makes him stop. He tells Katsuki to at least try working together because saying he'd rather lose is against Katsuki's nature.

Angered, Katsuki blasts the piece of wall next to Izuku's head and says that they can't avoid fighting All Might. Katsuki believes their only chance is to blast him at point blank range with all the firepower they have. When All Might passes by their alleyway, Katsuki makes himself known and blasts All Might from behind. All while struggling to come to terms with his decision to work with Izuku. Once Katsuki gets All Might's attention, he calls for Izuku to appear behind the number one hero, having given him a grenadier bracer beforehand. Izuku pulls the pin from the gauntlet and blasts All Might. He questions how Katsuki has been using such a powerful weapon and Katsuki orders them to run for the escape gate together.

While fleeing, Katsuki notices that All Might destroyed the entire area from their initial entrance to the escape gate earlier. Izuku comments that All Might isn't chasing them and perhaps got knocked out by the explosion. Katsuki tells him that he's an idiot for believing that and gets taken by surprise when All Might suddenly catches up to them with his blistering speed and breaks both of the grenadier bracers. All Might knees Katsuki into a building and grabs Izuku. Katsuki quickly recovers and rushes All Might again, only for him to slam Izuku into him and subsequently pin them both down. While immobilized, Katsuki mulls over All Might's overwhelming power and admits he is the worlds greatest hero.

All Might dissects their earlier plan and states that the fight is over because he's destroyed the grenadier bracers. Katsuki demands he stops talking and blasts All Might with a super explosion similar to the one he used against Ochaco in their Sports Festival fight. Then he grabs Izuku and warns him he's going flying. He throws Izuku towards the escape gate only for All Might to smash him into a nearby bus.

Katsuki rushes over to distract All Might and admits to himself that it was foolish to believe he could best All Might without taking any risks, and uses a second super explosion against him. Izuku moves slowly towards the gate and Katsuki yells for him to hurry. Katsuki continues to blast All Might with super explosions so that Izuku can make for the escape point which would force All Might to stop him. All Might does just that, giving Katsuki the opening they were looking for. However, All Might avoids Katsuki's attack and slams him into the ground. Falling out of consciousness, Katsuki bites All Might's hand and says he refuses to believe that he can't win even if he's up against All Might.

Surprisingly, Izuku does not escape; instead, he rushes back to help Katsuki. Izuku smiles and punches All Might in the face, asking his mentor to move aside. While All Might is suffering from slight recoil, Izuku grabs Katsuki's unconscious body and gets through the escape gate.

Katsuki and Izuku pass the exam and are taken to Recovery Girl's office to receive treatment. Recovery Girls scolds All Might for not restraining himself during the fight. Recovery Girl says that Katsuki likely won't wake up for a while and they should both rest with her. All Might muses over Katsuki's ability to smile in the face of adversity and says that he cannot wait to see how much stronger Katsuki will become much stronger in the future.

Once final exams conclude, Katsuki learns that he passed both portions of the final exams and will attend training camp during the summer. After class, Katsuki's peers decide to go shopping to buy what they need for the camp. Eijiro asks Katsuki to join them, but he refuses.

Forest Training Camp Arc
A day prior to summer break, Izuku invites Shoto and the other boys from Class 1-A to the pool for endurance training. They hold competitive swimming races and Katsuki wins his leg by flying over the pool instead of actually swimming. Just before Katsuki, Izuku and Shoto compete in the final race, Shota arrives and tells them they're out of time to use the pool and kicks them out. Afterward, Katsuki claims he'll never lose to Izuku or Shoto.

Summer break begins and Class 1-A rides a bus to a forest reserve belonging to the hero team: The Wild, Wild Pussycats. Pixie-Bob and Mandalay introduce themselves and challenge the students to reach base camp past the forest in three hours. When most of Shoto's peers refuse, he and his class are forcibly thrown into Beast's Forest by Pixie-Bob's quirk.

A monster created from dirt clods immediately attacks Minoru. Katsuki works together with Izuku, Shoto, and Tenya to defeat it. Class 1-A works together to fight their way through Beast's Forest. They encounter several different dirt monsters. Katsuki and Shoto take one out together, much to Katsuki's displeasure.

Class 1-A doesn't arrive at basecamp for several more hours. Well over their time limit, Class 1-A arrives at the base camp exhausted and battered. Mandalay reveals the time limit was the expectancy for actual heroes, not the students. Mandalay's nephew Kota, punches Izuku in his groin. Katsuki says the boy is precious, and Shoto compares the two to each other. This angers Katsuki and he threatens Shoto until Shota breaks it up. The Pussycats serve the students dinner and the boys bathe in the hot springs afterward.

Training begins the next day. Shota makes an example out of Katsuki by having him throw the ball like he did during the fitness tests. Katsuki expects to toss the ball over a kilometer but only throws it four meters farther. Shota explains that while the students have gotten stronger, their quirks have not. Katsuki trains by soaking his hands in boiling water to open his sweat glands and then creating a large explosion repeatedly. On the evening of the third day, Katsuki ends up paired with Shoto for the test of courage. He tries to make Mashirao switch partners with him, but Mashirao refuses. Class 1-A students roam the forest while Class 1-B students try to scare them. The duo is slightly shaken by a Yui Kodai and Ragdoll.

The League of Villain's Vanguard Action Squad unexpectedly attacks the training camp during the night. Shoto, who is carrying an injured Kosei Tsuburaba, and Katsuki walk through the forest while trying to avoid the poisonous gas. Mandalay sends out a message using her Telepathy Quirk, telling the students not to engage the invading villains. On their way, they encounter the villain Moonfish. Katsuki asks Shoto which group was ahead of them, to which Shoto answers Fumikage and Mezo. The villain admires a severed arm on the ground and turns his attention to the duo before warning them not to distract him from the flesh.

Mandalay sends a telepathic message to all the students giving them permission to engage in combat. She also informs everyone that Katsuki is one of the villain's targets. Katsuki ignores Mandalay's warning and rushes to attack Moonfish. Moonfish nearly stabs Katsuki with his Quirk enhanced teeth blades, but Shoto blocks it with his ice.

Shoto warns Katsuki not to attack carelessly. Irritated, Katsuki mentions that he gets the feeling Izuku is involved in Mandalay's sudden change of heart. Moonfish nearly stabs Katsuki again, but he evades. Shoto repels him using ice and the villain moves through the treetops using his Quirk. Shoto sternly tells Katsuki not to start fires because they could ignite the forest and kill their own classmates.

Moonfish continues his assault on the tandem from the sky. He rains down teeth attacks that pierce Shoto's ice and nearly strike the boys. Frustrated with his inability to fight back, Katsuki threatens to blast the villain without restraint. Shoto tells him not to and Katsuki angrily tells Shoto to cover the forest with ice should they burn. Shoto replies that a large scale explosion could impair his vision and make it difficult for him to target a fire.

Their battle is interrupted when a berserk Dark Shadow rampages through the forest chasing after Mezo, who is carrying an injured Izuku on his back. Mezo desperately pleads for one of them to provide light to tame Dark Shadow.

Shoto prepares to use his fire, but Katsuki tells him to wait. Moonfish attacks Dark Shadow and is ultimately crushed as a result. Katsuki advises Shoto to wait until Dark Shadow finishes the job and it defeats Moonfish. Immediately following the criminal's demise, Katsuki and Shoto create light with their Quirks to return Dark Shadow to its weaker form.

Katsuki reminds Fumikage that his Quirk is a bad matchup for Dark Shadow. Fumikage thanks the boys for saving him, and then the group decides their next priority is to escort Katsuki back to camp. Katsuki watches in confusion as the group devises a plan to protect him. When they decide on their strategy, Katsuki yells at them and tells them he doesn't need protection. They start to move out as Katsuki continues to complain.

The Bakugo Escort Team eventually reach Ochaco and Tsuyu fighting off Himiko Toga. Izuku recruits them to their mission. The girls question why Katsuki isn't present, forcing the team to realize that Katsuki and Fumikage are missing. Mr. Compress makes his presence known and explains that he took Katsuki with his magic because he'll shine brighter on the villain's side.

Izuku, Katsuki, Shoto, Ochaco and Tsuyu chase Mr. Compress until the boys are able to tackle him out of the air. They stop him at the villains rendezvous point and a battle ensues to decide the fate of Katsuki and Fumikage.

The team is able to rescue Fumikage, but Katsuki is ultimately captured by the Vanguard Action Squad. As his body is reverted from Mr. Compress' Quirk, Katsuki is dragged by his neck by Dabi into Kurogiri's portal. Izuku cries out for Katsuki, only for the latter to nervously reply for Izuku to stay back.

Hideout Raid Arc
Inside the League of Villains' hideout, Katsuki is strapped and restrained on a chair being surrounded by members of the Vanguard Action Squad, Kurogiri and Tomura. Tomura asks Katsuki to become his ally, but Katsuki vehemently tells him to drop the small talk and die. After Katsuki and the League of Villains watch a video clip of U.A.'s public apology, Tomura understands why society is blaming U.A. for their failure and that is because the current Hero society is not just. Spinner agrees that the current Hero society is not just since the modern Heroes are only doing their job for compensation and not out of selflessness. Tomura explains that the League of Villains are fighting for a just society and intends to win this battle. Tomura orders Dabi to remove Katsuki's restrains, although Dabi is unsure since Katsuki might attack; Tomura wants to treat Katsuki as an equal and is aware that Katsuki knows he has no possibility of winning. Dabi has Twice remove the restrains. As Twice removes the restrains, Mr Compress apologizes to Katsuki for forcibly kidnapping him and explains that the League of Villains are not just a group of hoodlums perpetuating crimes nor did they casually abduct him; he goes on by saying that everyone in the League of Villains is shackled by the current society and hopes that Katsuki understands their discrimination.

Katsuki's restraints are removed. As Tomura approaches Katsuki, Katsuki attacks Tomura with his Explosions. Katsuki tells the League of Villains that it is pointless to try and make him change his mind as he has already been won over by the way All Might looks when he wins. Katsuki says that from the beginning he has dreamed of becoming a Hero and surpassing All Might and nothing they say will change that.

After hearing Shota state that Katsuki desires to be a Hero, Katsuki tells his captors that U.A. are correct about him desiring to be a Hero. Katsuki taunts the Vanguard Action Squad and Tomura, telling them that his combat authorizations have not been revoked. However, Dabi, Himiko, Kenji and Mr. Compress are not intimidated; they wonder about Katsuki's mental state and conclude that he has messed up by going against them. After picking up his hand, Tomura decides that he must use force on Katsuki and asks his teacher, Sensei, to help him do so. Tomura orders Kurogiri and Mr. Compress to knock out Katsuki. Katsuki continues insulting the League of Villains while thinking of a way to cause a distraction that will allow him to make a run for the door behind him.Suddenly, All Might breaks in with Kamui Wood swinging in and restrains the League of Villains with his Lacquered Chains Prison. All Might checks on Katsuki and compliments him for not being afraid, much to Katsuki's chagrin.

As Gran Torino and All Might attempt to get information about Sensei from Tomura, mysterious black liquid appears with dozens of Nomus appearing out from the phenomenon. All Might grabs hold of Katsuki. Suddenly, Katsuki is engulfed by the black liquid and dissolves into it, much to All Might's fury.

Katsuki is teleported by the mysterious black liquid to Sensei's location which is near the ruins of the League of Villains' warehouse. Sensei apologizes to Katsuki as Tomura, Kurogiri and the Vanguard Action Squad finish materializing from the black liquid's teleportation.

All Might appears and clashes with Sensei. After All Might is blasted away, Katsuki becomes concerned, but Sensei tells Katsuki not to fret since his blast wave attack isn’t strong enough to kill him. Sensei uses a Quirk to forcefully activate Kurogiri's Warp Gate Quirk, causing a portal to appear and instructs the League of Villains to leave with Katsuki. However, Katsuki is not willing to give himself up so easily and prepares to battle the League of Villains. Katsuki fends off Himiko, Twice and Mr. Compress with his Explosions; All Might tries to help Katsuki only for Sensei to intervene.

During the battle, Izuku, Tenya, and Eijiro appear in the air from above. Katsuki sees the trio while Eijiro yells at Katsuki to take his hand. Tomura tries to take Katsuki, but Katsuki uses his Explosion to launch himself towards Izuku, Tenya, and Eijiro. Katsuki grabs Eijiro's hand and smiles.

Kenji and Spinner launch Mr. Compress into the air, but Mt. Lady intercepts him, allowing Izuku, Eijiro, Tenya, and the rescued Katsuki to get away. The boys land on the ground far from the battlefield and begin escaping.

Katsuki manages to escape to the front of the train station. Eijiro and Katsuki converse, with Katsuki stating that he was not rescued and that he only escaped with them so that he would not get in All Might's way. Katsuki watches the broadcast of the battle between All Might and All For One and becomes surprised upon seeing All Might's true form. Many civilians encourage All Might to win, with Izuku and Katsuki also encouraging him.

After the battle, Izuku and his group meet up with Shoto and Momo. They take Katsuki to a Police Station for his safety.

The Police Force take Katsuki back home. Shota and All Might visit the home of Katsuki Bakugo. Inside, Mitsuki Bakugo agrees to the U.A. students' relocation, being more than happy to send her son away. Katsuki and his mother begin arguing with each other while Masaru Bakugo tries to calm them down. After calming down, Mitsuki notes that Katsuki's rashness, along with his gifted abilities, has resulted in him being pampered and getting shallow praise for what he has. However, Mitsuki is happy that Shota sees her son for who he is instead of his gifted abilities. She once again agrees to leave Katsuki in U.A.'s care since her son returned home safe and sound thanks to the Pro Heroes, and asks Shota to make her son into a fine Hero.

As Shota and All Might leave the Bakugo household, Katsuki asks All Might what Izuku is to him. Unable to tell Katsuki the truth, All Might informs Katsuki that Izuku is a student to him who has great potential just like Katsuki. Satisfied to a degree with All Might's answer, Katsuki thanks All Might for everything and goes back inside his house.

Provisional Hero License Exam Arc
During the exams, Katsuki teamed up with Eijiro and Denki to take on Seiji Shishikura. Along with Eijiro, Katsuki also ends up getting his flesh manipulated by Seiji. He is later freed with Eijiro thanks to the help of Denki. They end up having their way through the other people that were held captive by Seiji. Due to his aggressive behavior, Katsuki ends up failing the exam alongside Inasa, Shoto and "Camie".

Katsuki then saw that Izuku made it to the finals, before he walked off making a subtle remark about Izuku's given power, meaning he now believed Izuku's word of getting a quirk as the latter looked after him shocked.

Internship Arc
As everyone gets their hero provisional license, Katsuki approaches Izuku and tells him they need to talk about his Quirk, which makes him nervous. Katsuki takes Izuku to Ground Beta, the site of the Battle Trial where he and Izuku fought for the first time. Katsuki remembers the time where Izuku was a Quirkless good for nothing and then suddenly out of thin air he manifested a Quirk and by some miracle he was accepted into U.A. High. He went on by listing Izuku's accomplishments which included receiving his Provisional Hero License while he failed. When Izuku tried to speak, Katsuki ordered Izuku to keep quiet and let him finish and stated since his kidnapping, he has been putting the pieces together and has been thinking about it the whole time. Katsuki states Izuku received his Quirk from All Might as he witnessed All For One's ability to steal Quirks and bestow them onto others as well as figuring out that All Might is an acquaintance of All For One. Katsuki hypothesized that All Might also has some form of Quirk transference because he has become weaker ever since coming to U.A and meeting with Izuku. Seeing that Izuku isn't denying anything, Katsuki knows that he is right about Izuku gaining All Might's Quirk.

Izuku asks Katsuki how knowing the truth about his Quirk is going to help him. Katsuki knows that he and Izuku have always looked up to All Might and seeing the person who he thought was a pebble on the side of the road being acknowledged by the person he looks up to is why Izuku is going to fight him here and now. Izuku questions the reason as Katsuki states its in order to gauge his talents and to vent out his anger after the events of the Forest Training Camp Arc, believing that All Might's retirement was his fault.

Seeing Izuku won't attack, Katsuki attacks him first and demands he fight back. Reluctantly, Izuku agrees as he wanted to see if his new fighting style would work against Katsuki. Knowing Izuku's mindset, Katsuki doesn't give him any openings to think and attacks him. However, this causes Izuku to increase his power and technique, which allows him to fight equally for the time being. Despite that, Katsuki's rage and determination fuel him and he ends up winning the fight.

After the battle, Katsuki berates him for his loss by asking how he could lose despite having the world's strongest power. Toshinori appears and comforts Katsuki, revealing his relationship with Izuku and One for All. Katsuki then promises to keep the secret between the three of them and vows to surpass Izuku with his quirk. They are then taken in by Shota who scolds at them for having a fight on school grounds. Because he started the fight, he is given four days of punishment while Izuku is given shorter time. As they were cleaning, Katsuki gives Izuku a few pointers on his new technique and tells him the flaw in his new fighting style.

While the others check up on Kirishima, Izuku, Ochaco and Tsuyu after their return from their internship battle, Katsuki decides to stay in the men's dorm. Denki teases Katsuki about worrying over Eijiro but Katsuki tells Denki to be quiet and pushes him aside.

Remedial Course Arc
The next day, Katsuki and Shoto retake the Hero License exam with Inasa and Camie Utsushimi. While there, they have to reach out to a group of unruly children with their hearts. Katsuki accurately deduces that there is a leader among the children who sets the mood for them to be rebellious. During all of this, Katsuki meets a young boy who has a similar attitude as him towards everything. Katsuki then advises him to not look down on others because then he would never acknowledge his own weaknesses. Katsuki ends up passing his exam alongside the others.

Eijiro requests for Katsuki to train with him since he wants to test his limits. Katsuki ignores him and ask Izuku if he has made any improvements in his Quirk but Izuku states he has not. Katsuki berates him for his lack of initiative, as he brings up Izuku's promise to surpass him before he leaves. He then takes Eijiro up on his request.

U.A. Cultural Festival Arc
At U.A. High School, Class 1-A chooses to make a band and dance performance for the U.A. culture festival.

While walking outside, Katsuki Bakugo overhears the Department of General Education talking about his class's performance for all of them. The Department of General Education students are taken aback by their arrogance even when they start all the conflict.

Back in Class 1-A's Heights Alliance, Tenya Iida is busy helping plan Class 1-A band and dance performance. Kyoka Jiro suggests club rock and asks if anyone can play instruments such as drums. Denki Kaminari remembers Katsuki having experience in playing drums which Hanta Sero agrees to. Katsuki refuses to as Hanta mocks Katsuki's inability to do so. Katsuki grabs some drum sticks and starts playing the drums proficiently. Katsuki's performance impresses Kyoka who wants him to play the drums. Katsuki begins walking away while expressing his disinterest. Katsuki also expresses his discontent with Class 1-A presenting the band and dance performance as a stress reliever, believing people who sicken him do not deserve his courtesy, and states that all they are doing is indulging the other students. Tenya and Momo Yaoyorozu take Katsuki's views into consideration as Shoto Todoroki points out that Katsuki should not speak ill of them if he has not even partaken in the conversation. Katsuki tells them that they do not fight villains because they enjoy it and likewise they should not consider people's feelings for a band and dance performance; if they are going to do a band and dance performance, they should do it for the sake of it and not to please or help people. Katsuki announces that he will blow everyone away in U.A. with his sound. Some of Class 1-A are surprised with Katsuki's willingness to participate; Kyoka also decides to do her best.

Joint Training Arc
Katsuki spots Izuku speaking to All Might and decides to get answers. He surprises the pair and tells their secret talks would get them caught and asks about Izuku's quirk and discovers it activated on its own. He questions if Izuku has truly made it his own since he intends to prove himself stronger than before getting annoyed by Izuku smiling at his challenge.

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