Katsuki is a young man of average height, with a rather slender but muscular build and slightly tanned skin. He has short, ash-blond hair that sticks up at all corners of his head but sits low on his forehead, reaching down to his eyebrows, and his eyes are sharp and narrow, a vibrant red. At school, he wears the standard U.A. uniform except for the usual red tie, and under his blazer, he wears a white button-down shirt.