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. She is the primary antagonist of the titular War Devil arc.

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 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
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 embarassing things if they serve her own goals, such as immediately attempting to make Yoshida her boyfriend, embarassing 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 embarassed 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 naive 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 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. Her relationship with Asa is more personal than Makima's relationship with Denji.

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. During their battles, Chainsaw Man had eaten away parts of Yoru's body, weakening them. This, combined with the long absence of war among humankind, has greatly diminished Yoru's strength.

War Devil arc
Appearing on Earth, the War Devil took over the body of Asa Mitaka. After quickly disposing of the two humans who killed Mitaka as a warm-up, the War Devil vowed to make the notorious Chainsaw Man vomit back up Nuclear Weapons, which he previously ate. After the War Devil takes over Mitaka's body, Mitaka wakes up in her room and the War Devil explains their current situation. The War Devil took over half of Mitaka's brain, leaving Mitaka's consciousness intact alongside the War Devil's, and allowing the War Devil to appear as a hallucination to Mitaka. The War Devil explains that she requires Mitaka's help to function in human society and not be recognized as a Devil, all while threatening to kill Mitaka if she does not comply with her demands. When Mitaka returns to school, she does not want to ask Yoshida about Chainsaw Man, which makes the War Devil annoyed. The War Devil then takes control of Asa's body and confronts Yoshida herself, asking about Chainsaw Man and if Yoshida wants to be her boyfriend. After being told that Chainsaw Man might be in the Devil Hunter club and having her romantic advances turned down, the War Devil allows Mitaka to have control again and demands she join the Devil Hunter club. She also explains that anyone who "belongs" to her can be made into a weapon, hence her attempt to make Yoshida her boyfriend.

After Mitaka joins the Devil Hunter club, she befriends Yuko. The War Devil asks Mitaka to kill Yuko and turn her into a weapon, explaining that the more guilty Mitaka feels about killing someone, the better a weapon they'll make. Mitaka refuses and the War Devil relents for the time being. In order to switch topics, Mitaka diverts the War Devil's attention by demanding that the War Devil stop calling her "girl" and use her first name, Asa, instead. The War Devil responds that Mitaka also does not use her name, and Mitaka claims that "War Devil" is too awkward to use. After considering this, the War Devil says that Mitaka can instead call her "Yoru", and begins to call Mitaka "Asa".

When Yuko and Mitaka encounter the Bat Devil, Yoru realizes she cannot take control of Asa's body when Asa is stricken with fear. As she attempts to get herself and Asa out of the encounter alive, she once again demands that Asa murder Yuko, attempting to manipulate her by asserting that Asa only felt bad about killing Bucky because she was seen. When her attempt to convince Asa fails she becomes angry, and as Asa flees with Yuko in tow, the three are incidentally saved by Chainsaw Man.

Yoru is extremely agitated at being saved by Chainsaw Man and throws a childish temper tantrum, after which she admits to Asa that she hates Chainsaw Man because he ate a part of her and weakened her power. As a result of having part of herself eaten, war no longer happens, which leads to her growing even weaker in turn. Asa surmises that the War Devil is afraid of being forgotten.

When Denji proclaims that he is Chainsaw Man to Asa, Yoru takes it at face value and believes him. As a result, Asa calls her stupid, which makes Yoru angrily deny being stupid. Asa apologizes, but also tells Yoru that if she wants to find Chainsaw Man, she should come up with a plan herself, and offhandedly comments that he would probably come out if a Devil was drawn near the school, which Yoru thinks is a good idea.

When it is revealed Yuko made a contract with the Justice Devil and is going to attack the school tomorrow, Yoru sees it as an opportunity to lure out Chainsaw Man by battling Yuko at the school. When Asa protests, Yoru possesses her and won't give her body back until Yuko is dead. She takes the katana Asa received from the devil hunters club and meets Yuko in the school hallway the following morning. Yuko reads Yoru's mind and tries to convince her to let her kill Asa's bullies and they can fight afterwards, but Yoru isn't falling for it. When Yuko claims that Yoru can't beat her anyway, Yoru gleefully reminds Yuko that if she were to kill her, Asa would die too. Yuko admits she likes Asa, but hates Yoru more and transforms into a devil form to battle Yoru.

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 could 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. Yoru often says the name of the weapon as she transforms it. It is unknown if she needs to say it's name in order to trigger the transformation. The strength of the weapon is proportional to the amount of guilt Yoru and/or Asa feel about creating said weapon. It is later revealed that 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.
 * Flesh Weapon Creation: The War Devil is able to make anything in her possession, including human 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 (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.
 * 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 (鉛筆の槍): 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

 * 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.
 * It could also 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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