Devil

 Warning: This page covers major spoilers regarding the identity of certain characters. Be careful if you aren't up-to-date with the latest chapters.

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).

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. It is implied that Devils can grow more powerful by consuming blood.

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 correlating with their name. The more fear is associated with a name, the more powerful the Devil who possesses it becomes. Each supernatural ability is unique to respective devil. Using these abilities usually consumes a portion of their blood.

All Devils can consume blood of other creatures to heal their injuries and increase their power. By consuming blood of stronger devils, weaker devils can be healed and strengthened.

Another ability common among all Devils is reincarnation: when a Devil dies, they reincarnate in hell; when they die in hell, they reincarnate in the world. This ability makes them practically immortal. However every time they reincarnate, their memories and personalities reset.

Contracts
Devils can make contracts with humans, allowing humans to borrow some of their power in exchange for a sacrifice. However, fiends are unable to perform contracts.

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. They are also unable to perform contracts unlike devils and humans.

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.

Hybrids are able to transform into their hybrids forms by a bodily trigger. Their regenerative abilities are nigh-limitless and they can revive if there is an adequate amount of blood to consume.

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.