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. He is a crude, arrogant, short-tempered, and aggressive person. He is incredibly focused on achieving his own ideals. He is not particularly nice or open with people, but will act less unfriendly and sometimes even kind to those that manage to earn his respect.