Katsuki is a 16 year old boy of average height(5'9), 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. Katsuki is a crude, arrogant, short-tempered, and aggressive person, though he can also be sensitive and kind in some very rare situations.