Devil

Devils (悪魔, Akuma or デビル, Debiru) are a race of supernatural creatures that exist throughout the world. Some are extremely hostile and became hated enemies to humans and very seldom work with one another. The more human in appearance a devil becomes, the less animosity towards humans the devil in questions shows; most known are capable of communicating.

When a devil is born, it is given a name. The more that name is feared the more powerful the devil is. Devils are capable of taking over a human's corpse, and turning them into a Fiend.

Devils can make a contract with humans, providing them power in exchange for a sacrifice.

In rare cases, a devil can become fused with a human turning them into a hybrid that can partially transform into a devil and manifest a devil's abilities.

A devil's powers are undone when they die.

Once they die Devils go back to Hell. If they die there they are revived back on the human world, thus they rotate in and out of these two worlds.