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 quirk allows him to turn his sweat into explosions whenever he pleases, causing him to have a caramely scent. He is currently in training at UA high to become a pro hero.