Some demons have different kinds of semi-species. Some grow a pair of horns but some have a cat-like feline appearance. Some of them also have different appearances for their tails, most often the female have heart-shaped tails while male have an arrow-like structure.
All demons have a pair of wings. Most of the times they can be seen used as aviation, but in some instances, due to the fact that their wings are too small to fly like Purson Soi, they are not able to.
Connection to Humans
Since ancient times Humans and Demons have some sort of a pact.