Katsuki Bakugo of the Anime Boku No Hero Academia

Stop talking. I will win. That's... what heroes do.
__Katsuki Bakugo to Izuku Midoriya in "Katsuki Bakugo: Origin"

Katsuki Bakugo, also known as Kacchan  by his childhood friends, is the deuteragonist of My Hero Academia. He is a student training to become a Pro Hero at U.A. High School.

Appearance

Katsuki is a young man of average height, with a rather narrow but muscular build and lightly tanned skin. He has short ash blond hair which spikes upwards at all angles away from his head, but sits low over his forehead, coming down to his eyebrows, and his eyes are sharp and thin, bright red in color.

At school, he wears the standard U.A. uniform, save for the customary red tie, and underneath his blazer, he wears a white button-up shirt with the first couple of buttons casually undone. Despite wearing a belt along with the uniform's dark turquoise pants, they're not pulled up all the way, giving them a very baggy appearance.

His hero costume is composed of a tight black sleeveless tank top, an orange “X” across the middle, the two upper prongs the v-neck collar of his shirt. His costume also has a metallic neck brace fashioned and used as a collar with rectangular ends, three holes in each of them. His sleeves reach from within his large grenade-like gauntlets to his biceps, and his belt, which also carries grenades, holds up his baggy pants with knee guards, below which he sports black, knee-high combat boots with orange soles and eyelets. His mask is jagged and black, and as it goes around his eyes, a large, orange-rimmed flare shape protrudes from each side.

In the winter months, he wears a large jacket with a high collar, rather than the usual tank top, although it does have the same orange “X” design, so he can still sweat a sufficient amount, which is how his Quirk works.

While interning under Best Jeanist, he wore a pair of blue jeans along with his hero costume rather than his usual baggy pants. His hair was also combed during this tenure, and parted to one side

Personality

Katsuki is a crude, arrogant, and aggressive person, especially at the beginning of the series. Katsuki tends to come off as an anti-hero, if not downright villainous for those not familiar with him. This problematic behavior goes all the way back to his early childhood days when he was known to bully a young, Quirkless Izuku Midoriya. However, after being accepted into U.A. High School and experiencing several personal defeats, one of them even coming from Izuku, Katsuki has gradually changed into a less antagonistic person, albeit still retaining a lot of his unpleasant traits.

Determined and thirsty for victory, Katsuki smiles eerily when in the middle of a battle. He is incredibly focused on achieving his own authentic victories and has learnt to never underestimate his opponents. He's quite talented in fighting, using his Quirk in various ways besides attacking. Katsuki is very intelligent and extremely perceptive, capable of strategic planning and holding some of the highest grades in his class, to the point that some even consider him a natural genius.

Katsuki tends to disregard the notion that Quirks shouldn't be used in public, and will activate his Quirk for a number of reasons, such as to intimidate someone, to punctuate a point, out of frustration, or even if he just feels like showing off. It is implied that Katsuki thinks little of the laws regarding public Quirk usage, as he once berated Izuku for not using his Quirk to defend himself in public.

While a rather volatile hero-in-training, and seen as villainous by many outside of his class, Katsuki knows who his enemies and allies are. He is not known to be particularly warm and open with his allies, but will act less unfriendly and sometimes even kind to those that manage to earn his respect. Because of his attitude and vulgar language, Katsuki's U.A. classmates often react negatively to him, although they have come to appreciate his skills and warm up to his personality. Katsuki matures slowly through his time at U.A., coming to befriend some of his classmates and willingly engaging in social interaction with his fellow classmates, though remaining aloof and solitary for the most part.

Due to the constant praise of his abilities and his powerful Quirk, Katsuki developed a superiority complex, and because of that, he desires to be the first and best at everything. As pointed out by many people, Katsuki loves to win above all else and cannot stand it when he doesn't, leading him to lose his already short temper or, less often, sulk. As such, he is fiercely competitive and will never settle for less than the number one spot. However, Katsuki also values hard work and fair play, and will refuse to acknowledge a winning result if he feels that his victory was not earned fairly. He detests to be looked down by others, which normally angers him, and will hold contempt towards those that don't take him seriously, while recognizing the effort of those that manage to put up a challenge against him.

While his inspiration for becoming a hero was the same as Izuku's, the Symbol of Peace, All Might, their beliefs differ: Katsuki feels a hero should never stop fighting or give up, regardless of the threat they face, and that always winning is the mark of a true hero. Furthermore, due to his arrogant and conceited behavior, various heroes, civilians, and even villains have commented on it. However, Katsuki is unwavering in his aspirations of heroism, having outright refused Tomura Shigaraki's offer for him to join the League of Villains, even after being offered power and the ability to 'win'.

Katsuki values honesty highly and never lies, to the point his brash candor is seen by some as rude and unsympathetic. He is never afraid of speaking what's on his mind and will notice when people are not being truthful to him. This shows that, despite his anti-social habits, Katsuki actually has great judgment of character.

Katsuki is immensely prideful, as he hates the idea of having to rely on others to assist him unless he is acknowledged as the leading figure within a team. Katsuki dislikes partaking in teamwork, claiming he can do whatever he's assigned on his own. His pride has cost him victories on numerous occasions, like the Battle Trial and the Provisional Hero License Exam. His pride is so intense that, when pitted together with Izuku against All Might, he outright refused his partner's help, saying that he'd rather lose than work with Izuku to pass the exam using Izuku's proposed plan. However, after realizing the true difficulty of the exam and confronted by Izuku, Katsuki was able to put his pride aside temporarily in order to cooperate with Izuku effectively.

Katsuki has a more vulnerable side, having been led to tears due to damaged pride a few times. It is thought by some that he has even had panic attacks due to his superiority complex and inability to always be number one as he wishes to be. 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. Katsuki has shown himself to be capable of gratefulness and has gone out of his way to repay or reimburse those who've helped him. Still, due to years of misunderstandings and tension, Katsuki has difficulty doing the same thing towards Izuku.