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's personality is not particularly kind or open with those on his side or anyone else, but he can act less unfriendly and even show kindness to those who earn his respect.