It's now confirmed, that Yoru's scars are visible to other characters when she's in control of Asa's body. Not just the readers.

Swordsmanship: Asa carries a katana as her weapon of choice, suggesting that she is capable of handling it. She is later shown using some kind of sword as her weapon of choice. After Hirofumi Yoshida introduces Asa to Denji, there is immediate friction between them due to their conflicting attitudes, and when Denji reveals himself to be Chainsaw Man, she doubts him and calls him a loser. The next time they meet, Denji is aggressive toward her, but still accepts her offer to take him out on a date. War Devil Possession: After having her body and half of her brain taken over by the War Devil, Asa is able to tap into the powers of the War Devil.

QUESTIONS & ANSWERS

Aki Hayakawa † • Angel † • Beam † • Denji ‡ • Furuno • Fushi † • Galgali † • Himeno † • Kato † • Kishibe • Kobeni Higashiyama ‡ • Kusakabe † • Quanxi • Madoka ‡ • Makima † • Masaki Ando † • Michiko Tendo † • Minami Nakano ‡ • Nakamura † • Nomo † • Power † • Princi † • Sato † • Subaru † • Tamaoki † • Tanabe † • Yutaro Kurose † • Hirokazu Arai † • Fumiko Mifune • Katana Man

Asa and Yoru’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, Asa will be referred to as the living host of the War Fiend. With the cosplayers' expressions and clothes, the two have accurately embodied the nature of Asa and Yoru's relationship. The second part of Chainsaw Man opens with a new protagonist, high school loner Asa Mitaka, who accidentally attracts the attention of the Justice Devil. As Asa lies in a pool of her own blood, she meets the gaze of the War Devil, who offers her a contract: in exchange for saving Asa's life, the high schooler will allow the War Devil to inhabit her body. Nothing comes without a cost, though. While Asa is now alive, she has to share her body with Yoru, and her thoughts are no longer private. What's more, Yoru harbors intense hatred against Chainsaw Man and will stop at nothing to find a way to defeat him. Chainsaw Man: Yoru and Asa's Relationship Akane Sawatari † • Aldo • Denji ‡ • Hirofumi Yoshida • Joey † • Kenzo • Santa Claus ‡ • Tolka † • Asa Mitaka • Yoru After worldwide fear of war increased, Asa's weapon making abilities enhanced and she no longer needs to touch the object to turn in into a weapon; merely calling out its name will suffice.Belt is sturdy, though even on the near smallest belt hole it's a little big on me but it's good quality. I wouldn't recommend wearing this daily though. It's nice to wear with costumes or rarely for interviews maybe.

Object Weapon Creation: Asa is able to turn any object that belongs to her into a weapon. An object that belongs to her can either be something she bought or took. Object weapons created by Asa thus far are: Room 606 Sword (606号室剣 606-Gōshitsu ken): A large claymore created from Asa's apartment complex that she bought. The length of the weapon is nearly as tall as Asa, with pipes, a vent, a ceiling fan and leaves sprouting around the hilt. This sword was strong enough to instantly destroy a tentacle of the Octopus Devil. This weapon was created without the need of Asa/Yoru touching it. Enhanced Durability: After the fear of war had rapidly risen across the world, Asa and Yoru experienced a power boost, which made it possible for Asa to stop Yoshida's blade (which was previously able to cut off her arm) with her bare hand, causing a mere skin-deep wound. So far, the only types of weapons created have been either melee weapons such as swords and spears or explosives such as a hand grenade. It is unknown whether Asa can create more advanced weapons such as modern firearms.Denji and Asa's relationship begins to improve after days of being trapped in the aquarium. Denji finds Asa sitting alone and asks how she is doing, to which she apologizes to him for the situation they are in and blames herself for asking him on a date in the first place. Denji tries to cheer her up by smiling and trying to find her something to eat, asking if she's ever had starfish before, which also implies that he was paying attention to her during her exposition on sea life. They further bond after Denji says he thinks Asa is fun to watch. This cheers up Asa as she enthusiastically affirms Denji's assessment of her character. Amused, Denji says that her enthusiastic and self-aggrandizing attitude reminds him of an old friend, implying that friend to be Power.