Devil

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Devils (悪魔, Akuma or デビル, Debiru) are a race of supernatural creatures appearing throughout the World.

Overview
Devils are born in Hell. All Devils are born with a name that correlates with something that exists. Each name is unique to its respective Devil. Devils manifest according to the collective consciousness surrounding their names (for example: the Gun Devil appears to be constructed out of guns and has gun related abilities). The more fear is associated with a name, the more powerful the Devil who possesses it becomes.

Devils that die in Hell reappear in the human world; Devils that die in the human world reappear in Hell; making them effectively immortal. Devils cannot recall any memories from their previous lives. According to the Angel Devil, him and the other Devils of Special Division 4 all remember the sound of the Chainsaw Devil's engine roaring before they died in Hell.

Devils feed on the blood of humans and other Devils. Naturally, most Devils are extremely hostile towards both. Some, however, are relatively friendly and feed by alternative means; such as the Fox Devil, who feeds through contracts with humans.

A variant of normal Devils are the Primal Devils. Primal Devils possess names that embody fears found naturally within the human psyche. They are shown to be immensely powerful and frighten normal Devils and Fiends, including those who were previously unaware of their existence.

Abilities
Devils possess supernatural abilities which correlates with their name and unique to each other. They are able to restore their health by consuming blood from humans, fiends, or other living creatures.

Another ability common among all Devils is the ability of revival: when a Devil dies, they are revived in hell. This ability makes them practically immortal. However, once they are killed in one dimension, their memories and personalities are reset. Thus, each incarnation of a devil is completely different people, as shown with Makima and Nayuta. However, their appearances or quirks can have similarities.

Contracts
Devils can make a contract with humans, providing them power in exchange for a sacrifice. A stronger devil requires a stronger contract, but if the devil likes it, people can sign a contract for a small price or borrow more power. These contracts are binding and once a devil and a human engage, a contract occurs. If any of them breaks the contract, it dies.

Fiends
Devils are capable of taking over a human's corpse and turning into a Fiend. The personality of the fiend may mirror that of the corpse if the brain is still intact, as evident by the Violence Fiend's polite and gentle attitude. In these scenarios, the devil may also retain some memories from the body they took over.

Fiends are less powerful than their devil counterparts and are able to use toned-down versions of their respective supernatural abilities. They can regenerate from drinking blood, but unlike hybrids, they can die if fatally wounded.

Hybrids
In rare cases, a human can become fused with a devil and turn into a Hybrid. This can be occurred via a contract. Hybrids have human consciousness and appearance, but can transform into a human-devil hybrid and manifest the supernatural abilities of the fused devil. The official name for hybrids was erased by the Chainsaw Devil, and hybrids continue to exist despite their erasure for unknown reasons.

Certain actions are triggers of hybrid transformation, with each action usually referencing a part of the devil a human is fused with (Ex. Denji transforms by pulling Pochita's tail like a Chainsaw start cord, Reze takes out a pin in her neck like a pin in a grenade). They are able to restore their health by consuming blood like devils and fiends. Their regenerative abilities are nigh-limitless and they can revive if there is an adequate amount of blood to consume. If there is not enough blood, the transformation will stop on the way even if they try to transform again, the armament will not appear even if you perform certain actions, or only the damage will recover and return to the human form. When transforming or disarming, the changed parts melt like mud.

There are eight known hybrids: Chainsaw, Katana, Bomb, Crossbow, Spear, Flamethrower, Longsword, and Whip. Besides Chainsaw, the others are collectively named as Weapon Humans (武器人間 Buki Ningen) by Makima.