Snake Devil

The Snake Devil (ヘビの悪魔) is a devil that embodies the fear of snakes.

Appearance
The Snake Devil has the appearance of an enormous snake with a large mouth made out of interlocking arms and hands instead of teeth. It has a single eye with black scelera.

Personality
The Snake Devil's personality is currently unknown.

Katana Man arc
As the Katana Man is being overwhelmed by Himeno and the Ghost Devil, he calls out to Sawatari for help. She raises her arm and summons the Snake Devil, commanding it to swallow the Ghost Devil whole. The Snake Devil instantly appears and swallows the Ghost Devil's body, decapitating it.

Later as Sawatari and Katana Man attempted to escape with a captive Denji, Kobeni appeared. Sawatari commanded the Snake Devil to attack with its tail but Kobeni's incredible agility allowed to avoid the attack and close the distance between them.

As the Special Division 4 invades Sawatari's headquarters she commands the Snake Devil to spit out the Ghost Devil which now fights on their side.

After Aki defeats the Ghost Devil, Sawatari attempts to summons the Snake Devil in a panic but she is stopped by Kobeni.

The Snake Devil soon after killed Sawatari as she was being arrested, possibly as a clause in their contract together.

Abilities
Contract Creation: As a devil, the Snake Devil can bestow contracts upon humans for a price. The contracts with it seen so far are: Absorption and Release: The Snake Devil can devour other devils with its gigantic mouth and then expel them at a later point to fight on its behalf. Doing so any being that is released is fully healed and can fight in place of the Snake Devil.
 * A contract with Sawatari. In exchange for her fingernails, Sawatari is able to summon and use parts of the Snake Devils body and even its ability to absorb and release beings. With this power, Sawatari has been shown to revive the Katana-Man, and control the Ghost devil to fight on its behalf.

Blood Consumption: As a devil, the Snake Devil should be able to restore its health by consuming blood.

Revival: As a devil, the Snake Devil should revive in Hell after being killed effectively making it immortal.