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.

In the winter months, he wears a large jacket with a high collar and four orange eyelets on the collar and two on each shoulder, rather than the usual tank top, although it does maintain the same orange "X" design, the purpose of which he can still sweat a sufficient amount in