Yoru

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

Yoru (ヨル) is the War Devil (の) that embodies the fear of war and conflict. She is a member of the Four Horsemen, who now occupies Asa Mitaka's body as a Fiend. First mentioned in the Public Safety Saga by Makima, Yoru debuted in the Academy Saga, where she is the deuteragonist.

Near-death State
Following the battle with the Four Horsemen and Weapon Devils, Yoru was also reduced to a “near-death state”, due to Pochita consuming most of her body. In this state, she appears to have a bird-like body, similar to a dark colored owl or potoo. While her bird form is similar to Pochita's dog form, her true form is still unknown.

Fiend
After taking over Asa's body and occupying half of her brain, 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 Yoru'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 first shown to be very confident and prideful, treating her opponents as mere warm-ups and confidently vowing to take back Nuclear Weapons from Chainsaw Man. This might be a sign of over-confidence as she lost to him previously while at full strength and is significantly weaker now. However she is aware of her limitations and will back down from a fight if she believes the odds are against her, adding to that she is afraid of the primal fears and runs away in fear after encountering one.

At first she is very hostile to humans threatening to kill Mitaka if she doesn't cooperate. She does not have a good understanding of human society or relationships and takes things at face value, is easy to provoke. Despite this she is tolerant of Asa's antics and frequently makes compromises with her such as offering her an alternative to killing other people or letting her avoid the topic for some time. Adding to that, she seems to show signs of sympathy towards Asa, commenting when Asa is being too harsh on herself after she falls into depression because of her inability to have lasting relationships (Asa was being influenced by the Falling Devil). Though it's unknown whether these feelings are genuine as she has been previously shown to be manipulative, for example trying to make Asa more comfortable with killing by framing it as a necessary evil or trying to gaslight her into killing Yuko by reminding her that she felt no remorse for Bucky's death.

Unlike her fellow Horseman Makima, who was almost always calm and composed Yoru is more flawed, immature and naïve. 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. She acts insecure whenever her strength or intellect is questioned. Yoru is also worried about losing her power and being forgotten, showing a more sensitive side.

Asa Mitaka
Yoru resurrected and inhabits Asa's body, turning her into the War Fiend, but left half of Asa's brain intact, keeping Asa alive. With the two now sharing one body, Yoru was originally planing to use Mitaka as a way to blend into human society as she's unfamiliar with it. She coerces Asa to cooperate under the threat of death. Despite making threats to kill her multiple more times through the story all of them seemed to be no more than saber rattling without any real weight behind them.

After their fight with Yuko, Yoru's perception of Asa changes, no longer viewing her simply as a means to blend it but realizing that Asa is extremely good at making strong weapons. Because of this Yoru views Asa as indispensable as she cannot defeat Chainsaw Man without her help. Hinting at this is the fact that she told Asa to "stay back" after encountering the Falling Devil suggesting she might have took over not only with the intent to protect herself but also Asa specifically.

Over time Asa grows used to Yoru's presence to the point of trying to chat with her having forgotten that they're currently separated. Adding to that Yoru will mention when she thinks Asa is being to self-deprecating and half heartedly try to comfort her which could be signs of genuine sympathy.

However Yoru could simply be putting on a mask to make Asa more likely to continue cooperating with her. Yoru still values her own goals greatly over Asa's feelings as shown by her deciding to kill Yuko despite Asa's protest or trying to turn Denji into a weapon after Asa falls in love with him.

Denji
Yoru and Asa decided Denji would be their target to be turned into a weapon. Despite not getting involved directly Yoru will push Asa to continue her date with him even as things don't go her way. She views him as a punk and is annoyed at her feelings of affection for him due to sharing Asa's brain. However her feeling for him are very shallow as she immediately tries using these feelings to turn him into a weapon albeit unsuccessfully.

Later during his movie date with Asa, after Mitaka tries to push him away presumably to keep him safe from Yoru. In response she takes over and kisses Denji likely in hopes of quickly winning his heart which would allow her to finally turn him into a weapon, but she is swiftly incapacitated by Nayuta instead. After kissing him she can be seen visibly blushing.

Though she doesn't know it yet Denji is her fabled arch-nemesis Chainsaw Man, who she eventually hopes to defeat in order to regain Nuclear Weapons and get revenge for what he did to her.

Fami
Fami who views Yoru as her "little sister" claims to be willing to do anything to help her, often without Yoru's own consent such as when she trapped Asa and Denji in the aquarium. Despite her apparent affection for her, Yoru doesn't reciprocate those feelings, describes her as insane and wants to stay away from her. Why Yoru wants nothing to do with her is currently unknown but likely will be revealed in the future.

Despite her apparent care for Yoru, she contradictorily doesn't seem to care about her safety and often puts her in harms way, such as when she got her under attack by a devil in the aquarium, or by choosing not to warn her of the upcoming primal devil attack despite having prior knowledge of it.

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 unless Asa is stricken with fear. Adding to that if Yoru is already in control but Asa get's frightened she'll lose control and be unable to regain it until Asa calms down.

Thanks to this unusual circumstance Yoru is able to feel human emotions despite being a devil. Whoever isn’t in control of the body will appear as a hallucination to the other and can even communicate to them. In addition Yoru is able to read Mitaka’s thoughts and access her memories while the latter is seemingly unable to do the same.

Physical Prowess

 * Enhanced Speed: Yoru is able to move very quickly, easily jumping around and dodging attacks from the contracted Class president and Yuko's devil form.
 * Enhanced Strength: Yoru 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: Yoru 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, Yoru 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. Adding to that her strength was reduced even further by becoming a Fiend.

Combining all of these factors her current strenght is a mere fraction of her full power and is by far the weakest horsemen.

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. As explained by Asa, there is no objective measure of when something belongs to Asa or Yoru, it relies entirely on their own perception and logic as shown when Asa paid 1 million yen to "buy" an entire aquarium and despite it being nowhere near enough money, it still qualified to be turned into a weapon.
 * Flesh Weapon Creation: Yoru 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 is ripped out of his body. The blade is 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.
 * Ruler Sword: A sword made by a measuring ruler found in Asa's backpack. It is a rectangular shaped sword approximately one meter long with a hole at its base for a handle.

Skillset

 * Swordsmanship: Yoru is a skilled swordswoman. She was able to easily take down the contracted Class President with her sword.
 * Spearmanship: Yoru also demonstrates her skills on using a spear during her fight against the devil who entrapped Asa and Denji in the aquarium.
 * Strategic Intelligence: Yoru prepared quite an elaborate setup in preparation for fighting Yuko, such as setting up traps and hiding weapons all around the school. This however wasn't of much use due to contracted Yuko's mind reading ability.

Trivia

 * The War Devil's bird-like appearance is that of a bird of prey, which often symbolize war or warriors. In politics, a war hawk or hawk is someone who favors war.
 * It is unknown if Yoru's distinctive head trait as a fiend can be seen by others when she is in control, or if only Asa sees it.
 * Yoru and Asa's exact species or "type" hasn’t been confirmed or explicitly stated in the manga as of currently, which has lead to much debate about their species, but for simplicity of the wiki and until else is confirmed, Yoru will be referred to as a fiend with Asa as her living host.
 * Despite being the deuteragonist we haven't once been "inside" her head, as opposed to Asa whose thoughts we're shown regularly. This puts the readers in a similar situation as Asa since we're left to wonder about how she truly feels and what her plans are.

Etymology

 * Yoru could be translated as "night" as a counterpart to Asa, which could be translated as "morning".
 * Yoru's scar is similar to the simplified version of the kanji radical hoko, which means "halberd" or "arms". The same radical is used in the kanji sen, which means "war".
 * A halberd is a weapon that is a fusion between an axe and a spear. Funny enough, the human that was later turned devil who liked Asa and hated Yoru, Yuko, carried an axe as a main weapon.

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