Katsuki Bakugo!

Katsuki has proven to be one of the strongest students in Class 1-A, both in his physical and theoretical abilities. Many professional heroes have remarked on his immense skill, including Shota Aizawa, All Might, and even the Number 3 Hero, Best Jeanist. The League of Villains has also recognized his strength and sent men to capture him in a futile attempt to recruit him.

Quirk: Explosion: Katsuki's Quirk allows him to secrete nitroglycerin through the sweat of his hands and detonate it at will to create explosions.[7] The more Bakugo sweats, the stronger his explosions become.[8] As noted by Best Jeanist, Katsuki has a strong understanding of his Quirk's applications.[9] He usually uses small, powerful explosions from his hands not only to blow up his opponents, but also to propel himself and move through the air, among other non-combat-related uses. He can maintain the sequence of his explosions long enough to destroy a giant ice wall created by Shoto.[10]

The explosions are powerful enough to send opponents flying with little time for them to react.[11] He can use them quickly enough to evade incoming attacks, even in mid-air.[10][12] His most powerful explosion to date (without the need for grenade gauntlets) was used to completely destroy Ochaco Uraraka's meteor shower, sending her flying away with the subsequent shockwave that shook the entire Sports Festival stadium.[13] He later uses it several times in succession when facing All Might in the physical test of the final exam.

Katsuki suffers some impact from his explosions due to their magnitude, but the overall effect is minimal given his physical conditioning.

Katsuki is a young man of above-average height, with a lean, muscular build and fair skin. He has short, spiky, ash-blond hair with choppy bangs that hang over his eyebrows. His eyes are sharp and a bright scarlet.

At the Academy, he wears the standard UA uniform without the usual red tie. Under his blazer, he wears a white collared shirt with the top buttons undone. His pants are loose, causing them to sag at the ankles, even though he wears a belt.

His hero costume consists of a tight, black, muscle-hugging T-shirt with an orange "X" in the center, forming a V-neck. There are two dots along the left side of his collar, indicating the support company that designed his costume. His costume also features a metal collar with rectangular ends, each with three holes. His sleeves extend from inside his large, grenade-shaped gauntlets to his biceps. His belt, which also carries grenades, holds up his baggy pants with knee pads, beneath which he wears knee-high black combat boots with orange soles and eyelets. His mask is jagged and black, and as it wraps around his eyes, a large, orange-rimmed flare protrudes from each side.

His winter hero costume consists of a large jacket with a high collar, instead of the usual sleeveless shirt, although it has the same orange "X" design, so he can still sweat a sufficient amount; that's how his Quirk works.

Internship with Best Jeanist: During this time (starting during the second season of the anime), he wore a pair of tight blue jeans instead of his usual baggy pants that came with his hero costume. His hair was also styled and parted, flattening its original "spiky" look.

Katsuki presented himself as a very impulsive, aggressive, and arrogant person, as seen in the way he treated Izuku, whom he constantly violated physically and psychologically, even inciting him to attempt to take his own life, showing his thuggish attitude.

He has a superiority complex, always wanting to be the best at everything and trying to prove it at all costs; however, even with these traits, he knows how to admit when he has been defeated, as demonstrated during the Trial Battle, when at the entrance of the academy, Izuku tried to explain to him that his Quirk One For All came from another person, and Katsuki interpreted that he was mocking him, so he tried to shut him up by saying that he simply beat him.

Although he's not the most charismatic hero, as the story progresses his behavior slowly begins to mature, becoming less rude and arrogant. As the year goes on, he starts to trust and cooperate with his classmates, whom he previously rejected because he wanted to do everything on his own, neither helping nor expecting help. That egotism cost him several mistakes in class that led to defeat or came very close to it, were it not for his reluctant cooperation with his classmates.

His inspiration to become a hero was the same as Izuku's: the Symbol of Peace, All Might. However, their beliefs differ: Katsuki feels that 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 boastful behavior, several heroes, civilians, and even villains have commented that his demeanor is more villainous than heroic. Nevertheless, Katsuki is unwavering in his goal of becoming a hero, having flatly rejected Tomura's invitation to join the Alliance of Villains.