Demons have a human sized body with a knobbly spine, short tail and three pairs of limbs: four prehensile limbs and two large wings. They also have a long head with a blunt snout, consisting of a bat-like nose, eyes with vertical cat-like slit pupils set far apart on the head, and a large mouth with 4 primary teeth and several secondary teeth. The backs of demons are covered in sparse, short black fur and there are folds of skin on the base of the neck.