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, especially at the beginning of the series. He tends to come off as unheroic to many people, but he has a kind and heroic heart, even though he isn't friendly.