Katsuki Bakugo

Katsuki is a boy of a slightly above-average height with a slender, muscular build. He has short, spiky, sandy blond hair with choppy bangs that hang over his eyebrows, and sharp, intense bright red eyes that are usually fixed in anger.

His Hero Costume consists of a tight, black, sleeveless tank top featuring an orange "X" across the middle, creating a V-neck design, with two black dots along the left side of the collar, which is the trademark of his costume's designer, Sasori Nimaru.[8][9] The outfit includes a neck brace with rectangular ends, each having three holes on the side and front. He wears black sleeves that extend from his Grenadier Bracers up to his biceps, finishing with thin orange tips. He has dark green gloves with orange palms, and under his Grenadier Bracers are metal-plated forearm bracers. A dark green and orange belt, equipped with two grenades on each side, secures his baggy pants that have dark green drop‑leg holster pouches secured by thigh straps, and metallic knee guards with four orange bolts fastened into them and two on the side. On his feet, he wears black, knee-high combat boots with orange soles, six eyelets on each boot (twelve in the manga), and black straps with orange tips at the top. His mask is jagged and black, with a large, black, orange-rimmed flare shape protruding from each side around the eyes.

Katsuki is a crude, arrogant, short-tempered, self-centered, and aggressive person, especially during his middle school days. Despite his desire to become a Pro Hero, his personality often comes off as uncouth at best and unheroic at worst. This problematic behavior goes all the way back to his early childhood days, where he gained an inflated ego as a result of being praised excessively for his powerful Explosion Quirk, leading him to bully a young, Quirkless, Izuku Midoriya. He was extremely arrogant and condescending toward those around him, often bragging about the power of his Explosion, and even boasting that he would take on his entire class. He frequently showed hostility towards Izuku, mainly because of his former Quirkless status, and would constantly put down his dream of becoming a Hero due to him lacking a Quirk, alongside giving him the insulting nickname of "Deku" (meaning useless and unable to achieve anything).

Katsuki is immensely prideful and prefers to act alone, as he hates the idea of being protected or having to rely on other people to assist him (which he takes as him being weak, causing him in turn to lash out) unless, in the latter's case, he is recognized as the unquestionable leading figure within a team. At the start of his time at U.A., Katsuki's cooperativeness was nothing short of atrocious, often ignoring his partners' ideas and suggestions for his own very direct approaches. His teamwork skills gradually improve, even if Katsuki keeps coming off as condescending through his usual tone. However, it's clear he now acknowledges their importance, protecting them from harm while expecting them to do the same for him in return. As a leader, Katsuki is mercilessly perfectionistic and will only be satisfied with complete, indisputable victories.

Katsuki has a more vulnerable side, having been led to tears due to damaged pride a few times. After the Battle Trial, Katsuki, when he saw Izuku's ability to outsmart him during their match and the fact that he couldn't beat him head-on, alongside later witnessing Shoto's power, admitted that Momo Yaoyorozu was right about how reckless he was during his fight with Izuku. Katsuki has also shown moments of fear and guilt, the latter due to viewing himself and his own weakness as the cause of All Might losing his remaining power and retiring as a Hero. Still, due to years of misunderstandings, tension, and pride, Katsuki has difficulty doing the same thing towards Izuku.

Quirk

Explosion: Katsuki's Quirk allows him to secrete nitroglycerin-like sweat from the palms of his hands and ignite it on command, allowing him to create strong explosions.[5] The more Katsuki sweats, the stronger his explosions become.[22] If Katsuki overuses this power, his forearms will start to ache.