Katsuki is a young man of average height, with a slim, muscular build, and a fair skin tone. He has short, spiky, sandy blond hair with choppy bangs that hang over his eyebrows. His eyes are sharp and bright red in color. Katsuki is a crude, arrogant, short-tempered, and aggressive person, especially at the beginning of the series. At school, he wears the standard U.A. uniform without the customary red tie and the top fee buttons undone. Casually, he wears a black tee shirt and baggy sweatpants.