Katsuki is of average height, with a slim, muscular build, and fair skin. 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. Katsuki tends to come off as unheroic. He is shown to be extremely arrogant and condescending to those around him, often bragging about his Explosion Quirk.