Demons

Demons are usually directly associated with Satan and tend to take up dead bodies to use as a form to walk around in on Earth. If they have inhabited a certain body for long enough, that will become their appearance even if the body is not present. The downside to being forced to walk around in a meat suit is the feeling that sometimes occurs that resembles how the person died.

Origins
Demons have been around since Lucifer was first banished to hell. Satan brought some of the angels that he had corrupted along with making some of his own to keep him company. Some of the first demons are still alive, while most of them have died in wars or gotten themselves killed.

Traits, Likes, and Dislikes
Due to being surrounded by darkness so often, Demons that roam the real world have tendancies to self-harm or be suicidal even if it won't do anything. However, they usually tend to be crafty and sly, lying often to get what they want. Not all can teleport, as only the crossroads demons can (deal makers), but all have rituals to summon them and can be controlled to do someone's bidding at a price. Most enjoy blood and gore, but also like cleanliness and the cold. Some are drug addicts, but none of them enjoy pain. Demons tend to be sassy.

Rivalries
Demons are most well known for being rivals with Angels and Archangels, though tend to hate anything holy anyways.

Appearance
A Demon's appearance varies on the body that it takes hold of. Therefore, it seems that Demons have the widest range of physical appearance out of all of the creatures aside from humans.

Naming Customs
Demons usually have two names- a human name and a name that they are given in hell. An example of a Demon's name switching around could be Adrian to Lórcan.