Katsuki Bakugo/Relationships

Izuku Midoriya
Katsuki and Izuku were playmates during their childhood. However once Katsuki learned Izuku didn't have a Quirk while he himself manifested a powerful one, he had since always considered the latter as a hindrance in his path to becoming the greatest hero, bullying Izuku for more than ten years and giving him the derogatory name "Deku" which he always calls him. In return, Izuku always refers to Katsuki as Kacchan (かっちゃん) despite their bad status.

In their adolescence, Katsuki continued to bully Izuku even burning a notebook of the latter. However, he was surprised when Izuku would try to save him from the Sludge Villain before All Might intervened on their behalf. Katsuki caught up with him and berated him for his actions, calling him a Quirkless failure most likely out of pride. At U.A., Katsuki still looked down on Izuku but was shocked to see that the latter had developed a powerful Quirk. This sight caused him to believe that Izuku was "hiding this power from him" he nearly attacked him for answers before he was restrained by Shota Aizawa. As he felt superior to Izuku, he overlooked Izuku's intelligence and ingenuity both of which Izuku used along with his quirk to finally stand up to Katsuki after they were made to fight each other. Due to this, Katsuki's ego caused him to believe Izuku was making fun of him even believing in one instance Izuku taunted him such as when Izuku tried to save him after Katsuki fell into a river. Katsuki brutally attacked Izuku and insulted him, as he demanded that he used his quirk in their fight. When Izuku finally used his quirk against him, Katsuki was ready to prove himself only to realize Izuku had another plan and defeated him for the first time.

After his loss to Izuku in the Battle Trial, Katsuki was in disbelief at Izuku defeating him as well to see his bad treatment left him isolated from the rest of the class. Katsuki now views Izuku as his arch rival even disbelieving Izuku's words of being given a quirk and swearing to beat him. He has always shown hostility towards Izuku whenever he interacts with him. Katsuki's antagonism towards Izuku only intensified after seeing Izuku improved on his use of his Quirk as well as using his moves to help. His antagonism is so great that even when teamed up with Izuku, Katsuki ignored whatever he suggested and went as far as to attack him for trying to help him and stated that he doesn't need his help. However, after Katsuki stated to All Might he would rather lose than accept help from others, an irritated Izuku (surprisingly) punched him in the face stating he's not the type to just give up like that. Though reluctant, Katsuki got the message and finally worked together with Izuku and willingly protected him from All Might so he could get to the finish line.

However, as pointed out by All Might and Ochaco, Katsuki is actually jealous of Izuku's growth and the potential to become stronger than him as well as that Izuku is far more popular and liked in U.A. than Katsuki. Katsuki however furiously denies such statements. During his second fight with Izuku, however, would prove that these statements are indeed true, that Katsuki would begrudgingly acknowledge he's been jealous of his growth knowing he had the potential to become stronger than him and cannot stand it.

After Katsuki was kidnapped by the League of Villains, Izuku was part of the Rescue Bakugo Team. Katsuki is hinted at piecing together Izuku's relationship to All Might as he gave a subtle remark about Izuku's given power, meaning he now believed Izuku's word of getting a quirk.

After the Hero License Exam, Katsuki called out Izuku to meet him at Ground Beta where they first fought. There, Katsuki told Izuku his deduction on All Might and All For One and deduced Izuku's Quirk was given to him by All Might. Katsuki, wanting to figure out why Izuku was given All Might's power, attacked Izuku, proclaiming they were going to fight.

After the fight, All Might explained to Katsuki about his power and Katsuki became one of the few to know the truth of Izuku's quirk. With this, it seems that, no matter how much he hates it, Katsuki does at least acknowledge Izuku's abilities. Katsuki seems to begrudgingly at least respect Izuku as a fighter and a rival, going as far as to point out a weakness of the latter's Shoot Style.

Interestingly, despite his malice towards Izuku, Katsuki has on two occasions shown his true feelings in front of him. Once, after admitting defeat to Izuku and his realization of how 'powerful' he truly was at U.A. and the second occasion when he confessed his anguish towards All Might's current state. Basically, Katsuki learns to see just how fearful he is of Izuku's rapid development and how much they could accomplish if they were to work together, and from there, the two slowly start to build their friendship back up.

Eijiro Kirishima
Other than Izuku, Katsuki interacts Eijiro out of all his classmates. Katsuki seems to get along well with Eijiro, despite their differing personalities.

Eijiro looks up to Katsuki's explosive attitude, often interpreting his actions as manly, something Eijiro appears to highly value. Although, he's not above getting frustrated with Katsuki's tendencies, as seen when Eijiro tried to get him to cool off after Monoma insulted them during the cavalry battle.

Although Katsuki at first didn't give Eijiro much attention, he seems to appreciate their Quirks' compatibility with each other, as he accepted Eijiro's proposal to form a team during the Human Cavalry Battle. However, at the beginning of the Sports Festival, Katsuki called Eijiro "hedgehog hair" (despite having spiky hair himself which got pointed out to him), which irritated Eijiro.

Their relationship better improves as the series progresses, and, overall, Katsuki gets along with Eijiro. As such, Eijiro is the only person in Class 1-A Katsuki actually respects and would possibly go as far as being called a friend. This can be seen as Eijiro went to Katsuki for studying for the mid-terms since the latter scored higher than him. As noted by Izuku, Eijiro is the only one in their class who can call out to help Katsuki without hurting Katsuki's pride, which was proven true and shows that Katsuki may view Eijiro as a friend. During the Hero License Exam, Denki stated that Katsuki had reduced the power of his explosions to avoid harming Eijiro, and they have even been seen studying together for the end of the term exams.

Katsuki appears to care about Eijiro as when Eijiro was sad about almost getting he and his classmates expelled, Katsuki tried cheering him up by paying him back for the 50,000 yen night vision goggles Eijiro bought to rescue Katsuki. When Eijiro openly voices his self-doubts, Katsuki reminds Eijiro that Eijiro proclaimed he's an unwavering horse during the Sports Festival and says Eijiro can be as strong as All Might if he refuses to go down. Eijiro later thinks of this the first time he uses Red Riot Unbreakable. Katsuki almost never praises or supports people, and the times Katsuki tries cheering Eijiro up are the first times Katsuki has tried comforting another character.

Because Katsuki has been kinder and more caring to Eijiro compared to anyone else he has interacted with, it's implied Katsuki's relationship with Eijiro is more personal than his relationship with others.

Denki Kaminari
Bakugo insults Kaminari frequently but they seem to have a friendly relationship. The two along with Kirishima showed to work together well.

Shoto Todoroki
Having witnessed his power, Katsuki was greatly shocked at Shoto's potential that made him questioned his worth.

Katsuki sees Shoto as another rival and someone that he needs to defeat to become Number One. On the other hand, Shoto has occasionally has been shown not to be scared of Katsuki in the slightest, casually making comments that could tick the other off. When Shoto and Izuku talked to each other after the Human Cavalry Battle, Katsuki secretly overheard Shoto's backstory, with a seemingly surprised expression on his face. Despite hearing Shoto's tragic backstory, Katsuki showed no sympathy towards him, although his statement about not caring about Shoto's problems or feelings could also be taken to mean he wanted the two of them to be able to fight without being held back by anything. After their battle in the Sports Festival, Katsuki despised Shoto due to him not giving him a battle worthy enough of being called Number One. Katsuki's anger caused him to be fully restrained during the closing ceremony of the Sports Festival so he wouldn't release his fury onto Shoto. In the English dub, his nickname for Shoto is 'Icy Hot'

During the Final Exams Arc, he made a promise to defeat Shoto after he just swore to take Izuku down as well. In this statement, he told the latter he won't have another half-effort win like at their previous match.

However, Katsuki seems to have let go of his grudge or put aside for a while as the two were seen having a normal conversation during their training at the lodge cabin. In other words, Katsuki and Shoto appear to be neutral with each other, with the latter not hesitating to interact with Katsuki in a relaxed way.

Ochaco Uraraka
Katsuki doesn't bother to interact with Ochaco, most likely due to her being friends with Izuku. Though they first saw each other in their mock battle, Katsuki was more focused on fighting Izuku that he ignored Ochaco.

They interact during the Sports Festival tournament when they have to face each other in the first round but Katsuki didn't recall her and thought very little of her. Though throughout their battle, Katsuki in his own way, had offered Ochaco the chance to withdraw since he would show her no mercy even if she is a girl. Katsuki was surprised by her ingenuity though overcame it without a problem before he recognized her as one of Izuku's friends.

Before the end of their match, Katsuki used her last name before finishing her off, indicating that Katsuki respects Ochaco's perseverance (as he usually doesn't use peoples' names). Katsuki even went out of his way to say that Ochaco wasn't fragile, even when his classmates said that she was. His nickname for her is "round face."

In an omake, Ochaco talked with Katsuki about his relationship with Izuku. She questions why he is so angry around him and correctly guesses his anger is really just a way to mask his insecurities and jealousy towards Izuku, but he just snaps at her.

Tenya Iida
Because of their equally forceful personalities and very different personal values, Katsuki and Tenya don't get along well. Katsuki looks down on Tenya's privileged background and dislikes being ordered around by him, whereas Tenya disapproves and frequently reprimands Katsuki for his improper behavior, questioning his intentions to become a hero. This was especially apparent when they were forced to partner up for the Trial of Battle.

Despite their bad standing, Tenya joined some of his classmates in saving Katsuki from the League of Villains. It is unknown what sort of standing they have now since this experience.

Toshinori Yagi
Similarly to Izuku and Shoto, Katsuki idolized All Might as a child. While very little of this respect and admiration remains in present time, it seemed to have a strong impact on Katsuki's belief in what a hero should be.

He first met the famed hero in person when the latter saved Katsuki after he was attacked by the Sludge Villain.

They met again at the U.A. High School, wherein the training match between Izuku and Katsuki, All Might scolded Katsuki his reckless and cruel fighting style that could have killed Izuku.

Despite Katsuki's aggressive nature, All Might acknowledges him as a promising hero but has repeatedly attempted to guide him whenever possible. Although his advice has often fallen on deaf ears and All Might is often unsettled by Katsuki's behavior, be it his aggression or his reckless drive.

Unfortunately, despite his past admiration for the renowned hero, Katsuki does not hesitate to either insult or challenge All Might to a fight, refusing to run away when he was assigned to fight him, only to suffer a humiliating defeat, just as Izuku stated. He was also angry and embarrassed that he had to be saved by All Might when he was kidnapped and even refused to thank him. Despite his antagonistic attitude towards his former idol, Katsuki did show concern when All For One attacked him, showing that he at least somewhat care for him.

After seeing of his true form, he still believed in All Might's ability to be a hero and refused to lose his faith in him. However, with All Might in retirement, Katsuki seems to have gotten a clue about All Might's relationship with Izuku, going as far as to ask him about what he is to him. Even still, Katsuki did thank All Might for saving him from the League of Villains.

In the end, Katsuki's admiration and concern for All Might were revealed to be larger than he had previously shown. During his fight with Izuku, he admitted that he blamed himself for All Might's retirement and current state after being kidnapped and after the battle with All For One. This had left a lasting impact on him, as he did not know what to do after the fact.

Having watched the whole sight, All Might comforted Katsuki after his battle with Izuku ended, he told Katsuki that he is not responsible for his pitiful state and apologized to him as well as told him the truth about One For All. Katsuki understood and promised to keep the latter's secret from others becoming one of the few to the truth of All Might's powers.

Tsunagu Hakamata
Katsuki selects Tsunagu for his internship. When Tsunagu styles his hair, he realizes he made a bad choice working for him. Though Tsunagu tried to teach Katsuki the qualities of a hero by learning to quell his anger, Katsuki didn't listen to any of his lectures.

Hanta Sero
Hanta and Katsuki tend to be in close proximity due to their friendships with Eijiro. They were in the same team during the cavalry battle, where it was demonstrated that Hanta often gets exasperated with Katsuki's extreme competitiveness but is willing to cooperate with him regardless. Katsuki refers to him as "Tape Arms" or "Soy Sauce Face."

Katsuki's Mother
Katsuki doesn't seem to hold much respect for his mother, as he insulted and threatened her in front of his teachers. However, these threats are more like his usual, childish reactions to everything and do not seem genuine.

His mother has a similar attitude towards her son, as she often yells back at him and insults him too. She is aware of her son's terrible behavior and disapproves of it. She blames this on the fact that her son has a strong Quirk and received a lot of praise for it, which caused him to develop his bad attitude. These words seem to make Katsuki angry at her since they are most belittling him. Katsuki's mother approves of her son going to U.A though, as she believes the school will see him for who he truly is.

All Might also comment that their family is the most dysfunctional one he has ever seen.

Katsuki's Father
Similar to his mother, Katsuki does not appear to hold much respect for him even insulting his own father in front of his teachers. However, these threats are more like his usual, childish reactions to everything and not genuine.

Unlike his wife, his father has rather calmer personality and tries to get through to his son but latter's short temper prevents from connecting with him. Like his wife, he clearly loves his son very much and does not approve of his son's arrogant attitude.

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