Description:
➳ take different forms in earth dimension
➳ can be easily spotted by their monstrous appearance, sensed by their dark aura and smelled by their scent (death)
➳ demon blood is called 'Ichor' (it's black with a slight green tint and very watery)
➳ when they die, their energy returns to their home dimension (e.g hell) or it gets shattered and takes centuries to reform
➳ for Mundanes the disappearance of a demon can take many forms: exploding, bursting into dust, fading from view, crumbling
➳ demons live on pain and suffering and sometimes they even feed on a person's happy memories 
➳ the only way to destroy the connection between a demon and a host, is to kill the demon (the host often dies afterwards)
➳ DEMON POX
➳ they were most likely created by Lucifer and Lilith

Abilities:
➳ possession of a human's body
➳ parrot human speech
➳ knowledge of several demon languages such as Chthonic, Purgatic, Gehennic, Tartarian

Weaknesses:
➳ vulnerability to angelic power and heavenly fire
➳ holy symbols
➳ direct force of sunlight
➳ can die a human death, when inside a human
➳ can't see through glamours

Greater Demons:
Greater Demons are demons that are more powerful and have identities. A significant class of Greater Demons includes the Princes of Hell.
Some greater demons:
➳ Abbadon
➳ Asmodeus
➳ Azazel
➳ Lilith
➳ Lucifer

Lesser Demons:
Lesser Demons don't have an identity or intellect and they are also more common.
Some lesser demons:
➳ Croucher
➳ Ravener
➳ Shax

Article by MountainChild01