Yoru

"Just you wait, Chainsaw Man! I'll make you vomit nuclear weapons back up!"

Yoru (ヨル) is the War Devil (戦争の悪魔) and a member of the Four Horsemen, who now occupies Asa Mitaka’s body as a Fiend.

Appearance
The War Devil is only seen briefly in its true form, but appears to have a bird-like body, similar to a dark colored owl or potoo.

After taking over Mitaka's body, the War Devil took on her appearance, but with added facial scars across her the center of her face and left cheek, which are in the same location where Mitaka's face was slashed by the Class President. In this form, the War Devil's eyes have multiple rings, similar to Makima, who is another Horseman. Her hair is also usually worn loose rather than in twintails like Mitaka. Yoru wears the school's female student uniform.

Personality
The War Devil is confident and prideful, treating its opponents as mere warm-up and confidently vowing to take back Nuclear Weapons from Chainsaw Man, contrary to its fellow horseman, Makima, who only thought it was a possibility to win against him. Also similarly to Makima, the War Devil is more than willing to use people for her own goals, forcing Mitaka to work with her under the threat of death.

The War Devil is very bold and blunt, and will not hesitate to do unusual or embarassing things if they serve its goals, such as immediately attempting to make Yoshida her boyfriend, embarassing Mitaka, and bluntly telling Mitaka about the possession situation. The War Devil also has a very flippant attitude towards death, easily murdering or offering to murder people for things ranging from actual crimes to bullying.

The War Devil is also cruel and holds little sentimental value or attachments to humans, uncaring of Mitaka's feelings, as evidenced by their blatant disregard for Mitaka's feeling of friendship for Yuko when repeatedly asking Mitaka to kill Yuko to use as a weapon.

History
As a member of the powerful group of Devils known as the Four Horsemen. They, along with the Weapon Devils once waged a brutal battle against the Chainsaw Devil in Hell, but at the height of the battle, the Chainsaw Devil disappeared, making them unable to find him.

War Devil arc
Appearing on Earth, the War Devil took over the body of Asa Mitaka. And after quickly disposing two humans as warm-up, the War Devil vowed to make the notorious Chainsaw vomit back up the Nuclear Weapons Devil who he previously ate.

Physical Prowess

 * Enhanced Speed: The War Devil is able to move very quickly, easily jumping around and dodging attacks from the contracted Class President.
 * Enhanced Strength: The War Devil was able to pull Tanaka's head off his shoulders and spinal cord out of his body, requiring a great deal of force, and is able to easily carry objects as big as herself with one arm over her head.

Devil Powers

 * Flesh Weapon Creation: The War Devil is able to make anything in her possession, specifically human and fiend, into a variety of deadly weapons almost instantaneously simply by touching them. This does not appear to immediately kill the human, as they can still scream in agony. The more guilty Asa feels about creating a weapon, the more powerful it is. The weapons created by the War Devil so far are:
 * Tanaka Spinal Cord Sword (田中脊髄剣): A long crooked sword that the War Devil created using Tanaka’s head and spinal cord that it ripped out of his body. Sharp enough to easily cut through devil-enhanced flesh with ease.
 * Flesh Hand Grenade (手榴弾): A hand grenade that the War Devil created using the arm from the contracted Class President. And it is shown that it is able to detonate like a normal grenade.


 * Fear Empowerment: As a devil, the War Devil can feed on the fear of humans and grow more powerful. The more fear people have towards the War Devil and war, the more powerful she will become.
 * Contract Creation: As a devil, the War Devil can bestow contracts upon humans for a price. However, The War Devil lost this ability when it took over Mitaka’s body, as a fiend cannot make a contract.
 * Blood Consumption: As a devil, the War Devil should be able to restore its health by consuming blood. This ability allows her to quickly regenerate from injuries.
 * Body Possession: As a devil, the War Devil could take over a dead human body and their consciousness, becoming a fiend. In this state, they could still use their devil ability albeit significantly weaken. Like all other fiends, the War Devil also has a distinct feature on her head. That being her facial scars, which only appear while it is in control of the body.
 * The War Devil took over the body of Asa Mitaka after her head got sliced in half. The War Devil, however, only took over half of her brain, leaving Mitaka’s consciousness intact while still being able to switch with it to take control over Mitaka’s body anytime it wants. While in this state, whoever isn’t in control of the body will appear as a hallucination to the other and could even communicate to them. If Asa is stricken with fear, Yoru is unable to take over her body.


 * Immortality: As a devil, the War Devil cannot die of old age and will live on pretty much forever if given the chance. However, she can still be killed by external factors, which can cause her to revive in Hell.
 * Reincarnation: If the War Devil is killed on Earth, she will reincarnate in Hell, making her essentially immortal. If she is killed in Hell, the War Devil will return to Earth, now with a completely different appearance and without any of her prior memories.

Skillset

 * Swordsmanship: In the body of Asa Mitaka, the War Devil is a skilled swordswoman. It was able to easily take down the contracted Class President with her sword.

Trivia

 * The War Devil’s bird-like appearance could be a reference to the little owl that accompanied Athena, the goddess of warfare in Greek Mythology.
 * Yoru could be translated as "night" as a counterpart to Asa, which could be translated as "morning".

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