Yoru

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

Yoru (ヨル) is the War Devil (の) and a member of the Four Horsemen, who now occupies Asa Mitaka’s body as a Fiend. She is a main villain protagonist of the Academy Saga after first being mentioned in the Public Safety Saga.

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. This weaken form could be the result of Pochita eating most of Yoru's body after losing to him a long time ago.

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 was another Horseman. Her hair is also usually worn loose rather than in twin tails like Mitaka. Yoru always wears the same clothes as Asa, most commonly a school uniform.

Personality
Yoru is confident and prideful, treating her opponents as mere warm-ups and confidently vowing to take back Nuclear Weapons from Chainsaw Man, contrary to her 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.

Yoru is very bold and blunt, and will not hesitate to do unusual or embarrassing things if they serve her own goals, such as immediately attempting to make Yoshida her boyfriend, embarrassing Mitaka, bluntly telling Mitaka about her possession, and demanding that Mitaka kill Yuko for her. This also displays the War Devil's flippant attitude towards death, along with her easily murdering or demanding that others murder people in her stead. Despite all this, Yoru also seems to have a sense of humor and wit - such as in her fight with the class president, where she exclaims "There, a happy ending!" as she intentionally plunges the Tanaka spinal cord sword into the class president in a way to make them kiss.

The War Devil is also cruel and holds little sentimental value or attachments to humans, and is mostly uncaring of Mitaka's feelings, as evidenced by her blatant disregard for Mitaka's feeling of friendship for Yuko when repeatedly asking Mitaka to kill Yuko to use as a weapon. However, she did not go through with her threat of killing Mitaka when Mitaka refused to go into school, and she has offered to do "favors" for Mitaka, such as "take care of" the kids who were bullying her and provided the easier name of "Yoru" when Mitaka complained that "War Devil" was too difficult to use as a name. It seems possible that she may have a slight degree of sympathy for Mitaka. Yoru's vendetta against Chainsaw Man also means that she will tolerate anything Mitaka says so long as her goal is ultimately still being worked towards.

Unlike Makima, who was almost always calm, composed, and seemingly untouchable, Yoru acts much more "human". She is prone to losing her temper, and became embarrassed and angry at being rescued unintentionally by her archenemy, Chainsaw Man. In her anger, she sometimes throws childish tantrums by punching and screaming into the pillows on Asa's bed. In line with this, she also appears more immature and naïve than Makima, although this might be caused by Asa’s influence as Devils that become Fiend could inherit the personality of the person’s corpse they possessed if their brain remains relatively intact when they died. She takes things at face value, is extremely prideful, extremely easy to provoke, and she does not have a good understanding of human society or relationships. She is also worried about losing her power and being forgotten, showing a more sensitive side.

Abilities
As a Devil, Yoru possesses all of the standard devil abilities, such the ability to make contracts with humans for a price, restoring her health by consuming blood, take over a dead human body and their consciousness, becoming a fiend, and reviving in Hell after being killed.

Currently, Yoru has taken possession of Asa Mitaka's body, after her head got sliced in half by the class president. The War Devil, however, only took over half of her brain, leaving Mitaka’s consciousness intact while still being able to take control over Mitaka’s body anytime she wants. When that happens, scars appear on Mitaka's face, and her eyes change to those of the War Devil. While in this state, whoever isn’t in control of the body will appear as a hallucination to the other and can even communicate to them. If Asa is stricken with fear, Yoru is unable to take over her body.

Physical Prowess

 * Enhanced Speed: The War Devil is able to move very quickly, easily jumping around and dodging attacks from the contracted Class president and Yuko's devil form.
 * 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.
 * Enhanced Durability: The War Devil is able to take hits that would kill an ordinary person, such as during her battle with Yuko she took a serious hit that flung her across a classroom and into a wall, but was able to get up moments later without any injuries.

Devil Powers
Although part of the Four Horsemen, the War Devil claims that her Devil power weakened after her body was partially devoured by Chainsaw Man. This, combined with the long absence of wars in the human world (the concept of which is only been relegated to movies and videogames), has greatly diminished her original strength.

Weapon Creation
Yoru has the power to make anything that belongs to her into a weapon. This includes both objects and living beings. In order to activate the weapon transformation, Yoru must touch what belongs to her and call out it's weapon name. The strength of the weapon is proportional to the amount of guilt Yoru and/or Asa feel about creating said weapon. Asa can also use this power when she is in control by holding an object she owns and speaking the weapon's name, given how guilt-ridden Asa is, her weapons appear to be stronger. By Yoru's own admission, the swords she made out of people were always 'average'.
 * Flesh Weapon Creation: The War Devil is able to make anything in her possession, including humans, devils and fiends, 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. In order to make a flesh weapon, Yoru must either: take a limb from the victim which she can then turn into a weapon, kill them and turn their remains into weapons, or form a relationship with someone wherein they "belong to her". The more guilty Asa feels about creating a weapon, the more powerful it is. Flesh weapons created by the War Devil so far are:
 * Tanaka Spinal Cord Sword: 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: 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.
 * Yuko Leg Sword (ユウコ): A katana-like blade made from one of Yuko's legs that were severed by the Devil Hunter Club, it presumably lacked unique abilities due to Yoru's lack of guilt, but it never managed to be used.
 * Object Weapon Creation: Yoru has shown the ability to turn objects that belong to her into weapons. Objects that belong to her can either be things she bought or things she took. Weapons created by the War Devil so far are:
 * Pencil Spear (の): A wooden spear made from a school pencil. This weapon changes form with each pencil, some are three-pronged spears approximately two meters long, others a meter long spear with four smaller spikes along the side. This weapon is sharp enough to easily kill a human, although Yoru calls them weak weapons.

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

 * Yoru could be translated as "night" as a counterpart to Asa, which could be translated as "morning".

Fan Theories
By user Mighty Viking:
 * The War Devil’s bird-like appearance could be a reference to hawks or eagles, birds of prey that symbolize war. Asa's surname Mitaka means "three" (三) (mi) and "hawk" (鷹) (taka). In politics, a war hawk or hawk is someone who favors war.
 * Another translation of her hosts' surname, Mitaka, is falcon which is a bird that symbolizes speed and victory. Going with Yoru's speed, agility and confidence in victory in battle.
 * It could also be a reference to the little owl that accompanied Athena, the goddess of warfare in Greek Mythology.
 * Yoru's apparent preference for making swords could be in reference to how War wields a sword in Revelations.

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