The user either is or can transform into a futakuchi-onna, a type of female yokai characterized by their two mouths – a normal one located on her face and second one on the back of the head beneath the hair. There, the woman's skull splits apart, forming lips, teeth and a tongue, creating an entirely functional second mouth. They have prehensile hair, although whether this is under their conscious control varies. Aside of their mouth, they appear perfectly normal women.