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. His hero costume is composed of a tight, black, sleeveless tank top, with an orange "X" across the middle, forming a V-neck. There are two dots along the left line of his collar, indicating the support company that designed his costume.