Katsuki Bakugo

Katsuki begins the series as an intelligent student with aspirations of being the world's greatest hero, but had an arrogant, violent and crude personality. He often bullied Izuku Midoriya with reasons being currently unknown, during their childhood. However, after Izuku was given the generations-old Quirk, One For All, he and Katsuki enter the prestigious U.A. High School and are both enrolled in Class 1-A. Katsuki receives character development on par with Izuku, learning the importance of teamwork and co-operation, becoming a leader, accepting help, and how to save others in order to win. He also begins developing a friendship with classmates Eijiro Kirishima and Denki Kaminari. However, Katsuki still holds onto his habit of yelling. After being kidnapped by the League of Villains, and refusing their offer to join them, Katsuki is rescued by All Might, his childhood hero. However, All Might's hero career comes to an end as he uses the last of his powers in the fight against the mastermind and his arch-enemy, All For One, which fills Katsuki with guilt that he was the one who put an end to the great hero's career. After failing the Provisional Hero Licensing Exam due to his guilt and aggressive attitude, Katsuki takes Izuku out to Testing Ground Gamma, and reveals he has finally put the pieces together on how Izuku received his Quirk, One For All, from All Might. After that, Katsuki challenges Izuku to a battle to deal with his guilt and ask why it was Izuku who was chosen to receive One For All, when they both grew up admiring All Might just as much as each other. After defeating Izuku, All Might arrives to stop the fight, reassures him that what happened was not his fault, and tells him the Origins of All For One, the injury that limited his hero work, his need for a successor, and All For One. After agreeing to keep this information secret, Katsuki becomes one of the few people to know the truth about One for All. As they return to the U.A. dorms, Katsuki promises Izuku that he will surpass him one day, to which Izuku responds that he will simply have to go even higher still than Katsuki, forming a proper rivalry between the two. Bakugo thinks that Izuku has been hiding his quirk all this time even when Bakugo bullied him for being Quirkless until Izuku explained to him later that he just got it and that it is a borrowed quirk that was passed on to him. This rivalry becomes a quick rekindling of their childhood friendship and the pair talk more since the fight, although sometimes playfully antagonistic. As one of the only people who know Izuku's secret, Katsuki is often found training with Izuku to help him master his awakening Quirks and even sits in on his meetings with All Might about One For All. While gaining valuable lessons attending his internship with Izuku and Shoto, Katsuki's heart begins to open up more to people. However, the turning point for Katsuki's character happens during the war with the Paranormal Liberation Army. Katsuki watches on as Izuku, who has been giving his all to keep Tomura Shigaraki in the air, is about to die to Tomura's piercing attack. In a moment of pure urgency, Katsuki awakens a new explosive technique that propels him fast enough to push Izuku out of the way and tank the hits himself. After Izuku left U.A. High School during the Dark Deku Arc, Katsuki and the rest of Class 1-A track down Izuku to bring him back to U.A. To convince Izuku to come back, Katsuki gives a big apology speech to him. He admits the reason he had to bully and reject Izuku was because of his jealousy in feeling the Quirkless boy's mindset was more passionate & closer to being a hero than he was (this would suggest he knew becoming a hero has nothing to do with being special or having powers). He also admits that he had been taking his inferiority complex out on Izuku the entire time. In the end, he finishes by saying the words he had been wanting to say since they had both almost died: he is so sorry for everything. Along with informing Izuku (which he says for the first time) that the latter's path was not ever misguided the moment he gained One for All, which he rightfully deserved. During the final battle, Katsuki faces off against an All For One-possessed Tomura Shigaraki, who gives him a fatal blow to the chest, killing him. After being resurrected by the hero Edgeshot using his "Zenith" ability, Katsuki returns to battle, despite his injuries, and uses his powers to battle All For One, whom he manages to kill after he is reverted to an infant before collapsing out of exhaustion. After regaining consciousness and discovering All For One is still alive in Tomura, he uses his explosion powers to shoot himself over to Tomura and Izuku in battle at Mount Fuji, and, with Shoto's help, uses an explosion to kill League member Kurogiri before he is able to teleport Tomura away. With this, Katsuki allows Izuku to land his final punch on Tomura, finally defeating him and the last of All For One. After graduating from U.A., Katsuki becomes one of Japan's top heroes and leads the funding for a new powered suit that allows Izuku to become a hero again.