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. Due to the injuries he sustained during the Paranormal Liberation War, Katsuki has two scars on his body: one on his left shoulder and one on his lower stomach area. Katsuki's right arm is all stitched up, and despite the surgery is unable to move again.