Possessor Demons
Possessor demons have the ability to possess other beings. Possessors don't need new bodies to survive.
Magical Beings
Beasts
The occurrence of two blue moons in one year has an interesting effect on the Charmed Ones, they transform into wolf-like beasts.
The Avatars
They are extremely powerful beings that exist outside of time and space, and they don't conform to either good or evil.
Other
Blue Moon
The blue moon emerges on rare occasions and is usually harmless. The occurrence of two blue moons in one year only happens every fifty years, and this happening can produce strange effects.