Hitoshi Shinso/Synopsis

History
In Junior High, Hitoshi was constantly told that due to the nature of his Brainwashing Quirk, he was more suited to becoming a villain. Many were wary of Hitoshi's Quirk and how he could control others with it, potentially against their will, and he was self-conscious over this. Despite this negative perception of him and his Quirk, Hitoshi held onto his dream of becoming a Pro Hero regardless of what others thought. However, this also led to him gaining a strong envy and resentment to those who had more "Heroic" Quirks that were accepted by society.

Hitoshi enrolled into U.A. High School and took the Hero Course's Entrance Exam. Because of his Quirk's drawbacks however, Hitoshi knew that him passing was not guaranteed and made a separate application to U.A.'s General Education Department. Hitoshi ended up failing the Hero Entrance Exam, likely because his Quirk had no effect on the Villain Bots, and instead made it into General Studies. Nevertheless, he kept his hope that he could earn his way to the Hero Course.

U.A. Sports Festival Arc
When a crowd blocks Class 1-A's exit, Katsuki Bakugo claims the crowd is there to scout the competition since they were the ones attacked by villains during the U.S.J. Incident. Hitoshi walks to the front of the crowd. He confronts Katsuki directly and explains that although he desired to be in the Hero Course, he was forced to take a different path. With the U.A. Sports Festival approaching, Hitoshi and other students will have the opportunity to usurp students in the Hero Course. After explaining this, Hitoshi says that he is not there to scout, he is there to declare war.

Weeks later, Hitoshi and his General Studies Course classmates take the field for the opening ceremony. Afterwards, Hitoshi participates in the Obstacle Race, avoiding Shoto Todoroki's ice while being carried by other kids, and places twenty-seventh.

Having qualified for the Cavalry Battle, Shinso teams up with Nirengeki Shoda, Yuga Aoyama, and Mashirao Ojiro and brainwashes them as well. By the end of the Cavalry Battle, Team Shinso places third after Hitoshi uses his Quirk to brainwash Team Tetsutetsu and steal their points. Afterwards, he thanks his "teammates" for their hard work.

The final round of the festival is revealed to be a One-on-One Fighting Tournament. Hitoshi tries to confront Izuku Midoriya, his matchup for the first round, but Mashirao warns the Izuku not to respond to the Hitoshi's provocations.

When the time comes for their match to begin, Hitoshi and Izuku walk out into the arena and meet each other on the fighting stage. As their match begins, Hitoshi insults Mashirao, calling him an idiot for throwing away his chance to be in the finals, just because his pride would not allow him to compete because he felt like he did not really earn it. This provokes Izuku, who starts charging toward Hitoshi and yells at him not to insult Mashirao. This response is more than enough for Hitoshi to active his Quirk, allowing him to brainwash Izuku, who suddenly stops in his tracks due to being put in Hitoshi’s trance.

Now that he has taken control of Izuku with his Quirk, Hitoshi tells him that he is lucky to have been blessed with a heroic Quirk. Hitoshi then orders Izuku to turn around and walk out of bounds. Izuku obeys and starts slowly walking toward the edge of the ring. However, just before taking a step out of bounds, Izuku uses One For All to break his own fingers and free himself of Hitoshi's control. Hitoshi tries to get Izuku to speak, but eventually realizes that Mashirao must have warned him before the match. Izuku tries to push Hitoshi out, but he punches Izuku twice to break his hold.

He continues to try and force a reaction out of Izuku by talking about how his Quirk puts him at a disadvantage and how Izuku is blessed to have a heroic. Then Hitoshi goes to push Izuku out of bounds, but Izuku counters and shoulder throws Hitoshi out of the ring. Having lost, Hitoshi appears to be greatly irritated. Izuku tries to console him by asking what is driving him to become a hero, but Hitoshi says it is simply what his heart longs for and leaves the ring.

Despite his loss, Hitoshi is greeted by his classmates' praises, as well as the praises of several viewing Pro Heroes. Having been encouraged, Hitoshi tells Izuku that even though he lost, he will still become a better pro than everyone in the Hero Course. When Izuku responds, Hitoshi brainwashes him temporarily and then stops to warn Izuku not to let his guard down. Hitoshi then tells Izuku not to lose and walks away.

Once the festival concludes, Hitoshi joins Class 1-B in watching the award ceremony.

Forest Training Camp Arc
At some point following the Sports Festival, Shota Aizawa approached him and offered to secretly train him in his personal fighting style. One day, Izuku spots Hitoshi walking along with Shota in the hallways and waves to him, but he ignores the greeting and continues walking.

Provisional Hero License Exam Arc
As all the students head toward Ground Beta for the second semester opening ceremony, Hitoshi complains that Classes 1-A and 1-B are holding up the back of the line. Hanta Sero comments that Hitoshi seems a little rougher than he did before.

U.A. School Festival Arc
Hitoshi assists his class in setting up their Haunted House exhibit for the U.A. School Festival. On one day, he reflects to himself over his guilt about preparing to transfer into the Hero Course, his training with Eraser Head, and how his classmates would feel about him leaving. Spending his time walking around the school and checking out Classes 1-A and 1-B's set-ups, he stumbles upon a group of 1-A students, including Mashirao and Izuku, hanging out in a classroom. He overhears their conversation which leads into discussing the Sports Festival, where Mashirao brings up Hitoshi, to his shock, making fun of Izuku for getting Brainwashed by him despite his warning. He starts to feel a little guilty hearing Mashirao bearing no ill will toward him over the incident, and ecstatic when he hears Izuku talk about all the great uses a Hero with a Brainwashing Quirk could have. He realizes he needs to get stronger until he can properly face them. He heads back to his class ready to tell them about his transfer, only to overhear them and learn they already knew about it and are planning a party to light a fire under him, which helps to gain more confidence for himself looking into the future.

During the Festival itself, he participates in his class' Haunted House by dangling from the ceiling, with blood dripping on his face to scare his fellow students. One such group included 1-A's Mina, Denki, Minoru, and Toru.

Joint Training Arc
At the beginning of December, Class 1-A and Class 1-B gather at Ground Gamma for their first Joint Training Battle exercise. Vlad King and Shota settle down the classes and introduce Hitoshi, revealing he's a special guest participating in the exercise, and that he hopes that he can join the Hero Course. The class enthusiastically greets Hitoshi, while commenting on his outfit, noting his mask and the Capturing Weapon he's wearing. At Shota's urging, Hitoshi introduces himself to the class. He tells everyone that his goal is to become a great hero who can help people with his Quirk.

As Shota and Vlad explain the rules of the exercise, and that Hitoshi will participate in two battles; one with Class 1-A, and one with Class 1-B. After Class 1-A and 1-B draw lots to determine their teams, Hitoshi draws his own lots. He's placed into Class 1-A's Team 1 and Class 1-B's Team 5. As Class 1-A prepares for the first match, Hitoshi explains his Quirk to his teammates, going over the strengths and weaknesses of the Quirk. He explains that the Artificial Vocal Cords allow him to change his voice, helping against those who know his weakness.

The match begins shortly afterward, and Class 1-A's Team 1 laments they didn't get to form a proper plan. They decide that regardless, they'll have to fight to win. Class 1-A begins to move forward through the battlefield.

Suddenly, Jurota Shishida, carrying Kosei Tsuburaba on his back, ambushes them by smashing both Eijiro and Tsuyu. After a short scuffle, Hitoshi uses his Ultimate Move: Persona Chords, to mimic Kosei's voice and brainwash Jurota. Hitoshi tries to restrain Jurota with his Capturing Weapon, but Kosei quickly traps him with Air Prison.

During the following skirmish, Tsuyu Asui managed to capture Kosei, but Jurota captures Eijiro Kirishima and Koji Koda before retreating. Hitoshi is released from the Air Prison and apologizes for his lack of battle readiness, but Tsuyu counters with her own apology as Denki Kaminari tries to cheer Hitoshi up.

The remaining trio devises a plan to defeat Class 1-B. With her mucus, Tsuyu manages to fool Jurota's sense of smell, Denki uses his Sharpshooting Gear to locate Class 1-B' team, and acts as bait, helping Tsuyu and Hitoshi get into place unnoticed. Hitoshi gets into position within the maze of pipes and waits for his opportunity to strike. He calls out to Ibara Shiozaki with his voice changer, mimicking Hiryu Rin's voice. Ibara responds, falling victim to Hitoshi's Brainwashing.

Jurota identifies Hitoshi's location, and eventually reaches his hiding spot. Hitoshi uses his Capturing Weapon to bring down a large pipe on Jurota's head. His plan fails to knock out Jurota, but Tsuyu throws Hiryu at him and knocks them both out, saving Hitoshi. Thanks to this, Class 1-A wins the first round. Despite the victory, Hitoshi expresses his frustration at being unable able to apply much of his training, but Shota assures him that it will take time for him to become a pro. The other teachers expresses their admiration of Hitoshi's skills.

After rounds two, three, and four are finished, Hitoshi prepares for Round Five, with his teammates from Class 1-B. Hitoshi and Neito Monoma agree to take care of Izuku, while the rest of the team take care of Izuku's teammates. After the battle begins, Hitoshi hides near Neito, and spots Izuku. He uses his Artificial Vocal Cords to imitate Ochaco Uraraka's voice, startling Izuku.

Soon after, he witnesses Blackwhip's power exploding out of Izuku, and his struggles to contain it. The black tendrils begin to latch on to objects in the area, pulling Izuku through the maze of pipes to where Hitoshi's hiding. He yells for Hitoshi to run, terrifying him. He later witnesses Ochaco grabbing Izuku. She yells for Hitoshi to brainwash him, in the hope that the out of control power will subsequently stop. He removes his mask and says, "Let's fight!" to Izuku. Izuku replies by agreeing, and falls under Hitoshi's Brainwashing once again.

After the mysterious power of Izuku's comes under control, the match continues. Izuku confronts Hitoshi directly, who tries to counteract him, and then tries to flee when he realizes that he can not deal with him. However, Izuku ends up capturing him, while the rest of the team members of Class 1-B are defeated and captured by the 1-A team. Hitoshi expresses his surprise and frustration with his loss but nonetheless smiles, musing that the Hero Course is rather impressive.

After the match, Hitoshi expresses to Shota and Vlad that he knew the exercise was meant to serve as his entrance exam for the Hero Course, also saying that he was disappointed in his performance. When Izuku thanks him for helping him, Hitoshi declines Izuku's gratitude, claiming that he acted on his own desire to have a rematch with his old rival. Shota scolds him, telling him that it's okay that he acted selfishly, noting that Heroes can't help others if they can't find the strength to drive themselves forward.

Hitoshi is bewildered by all the kind words and gets even more shocked when Vlad King announces that he'll be joining the Hero Course starting from his second year.

Final War Arc
Over the following months, Hitoshi continued to train and perfect his Quirk so that he can keep up with the rest of the Hero course students once he gets admitted at the start of the second year. During this time he pushed through the limits of his Quirk to the point that he could get other people to speak while brainwashed, as well as also having created his own Hero costume. However, in March, the Paranormal Liberation War occurs, resulting in the fall of hero society, as All For One and many prison escapees roam the streets causing terror, with trust in heroes diminished. Due to all this, classes at U.A. were suspended, meaning the Hero students were still in their first year, and Hitoshi's transfer was postponed.

Despite this, Hitoshi was given the chance to greatly assist in the upcoming Final War against the army of villains led by All For One. Taking advantage of his newly gained ability to get brainwashed people to talk, he is enlisted by Eraser Head with the goal of using him to brainwash Yuga Aoyama and his parents, who it turns out were unwilling spies for All For One, and get them to speak to him, allowing them to hide any deception or emotion in their voices, and thus manipulate All For One.

On the eve of the War, All Might brings Hitoshi to Class 1-A to explain the plan, with them all greatly excited to see him again. Tsuyu is surprised to hear about the plan, given the supposed limitations of his Quirk, leading Hitoshi to explain his developments to the class. This garners praise from Class 1-A, who ask which class he will be joining next year, followed by even more applause when they learn Eraser Head trained him.

Shortly before the day approaches, Hitoshi brainwashes the Aoyama parents and successfully deceives All For One into dropping his guard, as he asks them for Yuga's phone number. Hitoshi then uses his Brainwashing on Yuga to contact All For One on the day of the operation, luring him to meet at an abandoned parking lot, which is where the final battle will be set.

At some point during the battle for Gigantomachia's containment facility, the anesthesia that U.A. students used to throw into Gigantomachia’s mouth wore off, allowing Gigantomachia to finally be awakened. Before the behemoth can go on a rampage again, Hitoshi was able to use his Quirk to brainwash the behemoth into submission using Persona Chords, imitating All For One’s voice after using the recording device from Aoyama’s phone.

With Gigantomachia now under complete control, the behemoth gathers the remaining heroes and streaks across the landscape to the Gunga Mountains where the U.A students join the battle against All For One as reinforcements for the Heroes and payback for the Paranormal Liberation War. When Gigantomachia reaches to the battle, he and the U.A. students realized that All For One is trying to flee the battle, so Hitoshi orders Gigantomachia to throw a giant mountain directly at his master, but the villain obliterates the attack, cursing him and Eijiro for taking control of his behemoth.