Katsuki Bakugo/Relationships

Izuku Midoriya
Katsuki and Izuku were playmates during their childhood, but Katsuki always considered the latter as a hindrance, an obstacle, in his path to becoming the greatest hero. Although he felt superior to Izuku, there are times where he feels that Izuku was making fun of him, such as when Izuku saved him, or due to Izuku "hiding the fact that he had a Quirk all this time". As of now, Katsuki sees Izuku as his arch rival and has always shown hostility towards Izuku whenever he interacts with him. Katsuki's antagonism towards Izuku is so great that even when teamed up with Izuku, Katsuki ignored whatever he suggested and went as far as to say that he doesn't need his help.

Eijirou Kirishima
Katsuki seems to get along well with Kirishima, despite their differing personalities. Eijirou looks up to Katsuki's explosive attitude, often interpreting his actions as manly, something he appears to highly value, but he's not above getting frustrated with Katsuki's tendencies, seen when he tries to get him to cool off after Monoma insulted them during the cavalry battle. Although Katsuki at first didn't give him much attention, he seems to appreciate their Quirks' compatibility with each other, as he accepted Ejirou's proposal to form a team during the Human Cavalry Battle. He was also unable to remember Eijirou's name, calling him "hedgehog hair" (despite having spiky hair himself), which bothered Eijirou.

Shouto Todoroki
Katsuki sees Shouto as another rival and someone that he needs to defeat to become Number One. When Shouto and Izuku talked to each other after the Human Cavalry Battle, Katsuki secretly overheard Shouto's backstory, with a seemingly surprised expression on his face after hearing it. Despite hearing Shouto's tragic backstory, Katsuki showed no sympathy towards Shouto and even said that he didn't care about Shouto's problems or feelings. After their battle in the Sports Festival, Katsuki despises Shouto due to him not giving him a battle worthy enough of being called Number One. Katsuki's hatred of Shouto caused him to be fully restrained during the closing ceremony of the Sports Festival to prevent him from unleashing his fury onto Shouto.

Ochako Uraraka
Katsuki doesn't bother to interact with Ochako, most likely due to her being friends with Izuku. They first interact during the Sports Festival tournament when they have to face each other in the first round, with Katsuki in his own way had offered Ochako the chance to withdraw as he will show her no mercy even if she is a girl. Before the end of their match, Katsuki used her last name before finishing her off, indicating that Katsuki respects Ochako's perseverance (as he usually doesn't remember peoples' names). He even went out of his way to say that Ochako wasn't fragile, even when his classmates said that she was, she is the only girl he actually acknowledges. His nickname for her is "round face."

All Might
Similarly to Izuku and Shouto, Katsuki idolized All Might as a child. While very little of this respect and admiration remains; it seemed to have a strong impact on Katsuki's belief in what a hero should be. Despite Katsuki's aggressive nature, All Might repeatedly attempts to guide him whenever possible. Although his advice often fallen on deaf ears and All Might is often unsettled by Katsuki's behavior, be it his aggression or his reckless drive.