Demons are the race that populates the whole Demon World, and they are often the most characters that appears in the Mairimashita! Iruma-kun Wiki series.
Appearance
Some demons has different kind of semi-species. Some grow a pair of horns but some has cat-like feline appearance. Some of them also has different appearances of tails, most often the female has heart-shaped while male has arrow-like structure.
Wings
All demons have pair of wings. Most of the times they can be seen used as aviation, but 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.