Itto is a tall man with a large build. He has long, spiky white hair with pinkish tips, and eyes that are red in color and have elongated pupils. There are red lines on his face, arms and torso. Itto has two sharp red horns on his head and small fangs, showing that he is an oni. In Japanese mythology, Oni is a type of yōkai, which are large fanged and horned demons with a ferocious nature.