Aoi Kanzaki

Aoi Kanzaki (アオイ) is a Demon Slayer, though she works as a helper at the Butterfly Estate rather than taking to the front lines.

Appearance
Aoi has blue eyes and black hair which she ties into twintails. She wears two blue butterfly clips to keep her twintails in place. As Aoi is a Demon Slayer, she wears the standard uniform with the addition of a white nurse dress on top of it. Her uniform is tinted slightly blue. She is often seen with a frown.

Personality
As she trained Tanjiro, Zenitsu, and Inosuke, she is very tough on them, pushing them to the limit. She has a firm personality, unlike her colleagues at Butterfly Estate.

Her personality is also somewhat similar to that of the young Shinobu Kocho, volatile and open. She often appears angry, and in general displays how she feels very obviously. She looks openly surprised at Tanjiro's reassurance, bursts in to tears when discussing Inosuke's serious injuries, and declares that she enjoyed the time spent with the trio when they were at the estate.

Despite her somewhat gruff demeanor, she is kind and caring, and does her best to help the hunters who come through the estate.

History
At some point, Aoi's family was killed by demons. As a result, she was taken in by the Butterfly Estate, where she received breath training.

Aoi managed to survive Final Selection, though she claims that it was through pure luck. She was too afraid to go in to battle despite passing the Final Selection, and as a result she decided to work at the Butterfly Estate instead. She seems to undervalue her own work, and claims that she isn't doing much compared to full fledged hunters.

Although she cannot fight, she is well versed in medical knowledge, and was presumably taught by Shinobu. She helps with the upkeep of the estate, and cares for injured hunters.

Functional Recovery Training Arc
Aoi first meets Tanjiro when she discovers him and the Kakushi talking to Kanao in the garden. She brings them inside to the recovery beds, and displays clear frustration at the injured Zenitsu's constant wailing. She provides care for the trio throughout their stay.

During the training portion of their recovery, she explains the general ways they will be trained. These include massage, reflex, and tag games. Aoi and Kanao both play the reflex and tag games. Aoi is quickly beaten by Zenitsu, who refuses to splash the medicinal water on her. Aoi is still displeased with Zenitsu, since she had heard him ranting about how wonderful it is to train with girls, since he gets to touch them. He also beats her in tag, but she punches him when he gets too touchy.

She is also beaten by Inosuke in the games, and later by Tanjiro. She becomes annoyed when Inosuke and Zenitsu stop coming to training.

When the trio depart, she tells Tanjiro that she enjoyed sharing her time with him, and wishes him good luck. Tanjiro responds by thanking her for taking care of him, and she deflects by saying it isn't much, since she can't fight like the others. Tanjiro tells her that her being unable to fight has nothing to do with it, and that since she helped him, he'll carry her feelings in battle as well. Aoi seems surprised by this response, but not unhappy with it.

Demon Train Arc
Aoi once again helps care for the injuries of the trio following their fight on the train.

Red Light District Arc
Aoi and Naho were both picked up by Uzui Tengen, who wanted them to help infiltrate the red light district. Kanao Tsuyuri attempted to stop the pillar from taking the two girls away, but was still having trouble with her own lack of resolve, and so she did not say anything to stop him. Tanjiro interrupted during the commotion, and told Uzui to release the girls, to which Uzui responded that he needed a female demon hunter for his mission, and planned on taking Aoi and Naho. When one of the younger girls explained that Naho was not a demon hunter, Uzui dropped her and instead planned on taking only Aoi. Aoi seemed distressed and upset when Uzui commented that even if she wasn't useful, she was still a hunter's member. Tanjiro, Inosuke, and Zenitsu eventually volunteered to go in Aoi's place, and so Uzui released Aoi.

Abilities and Powers

 * Medical knowledge: After training under Shinobu Kocho, Aoi is able to concoct most of the more simple medicines.
 * Above Average Strength: While Aoi is weaker than most of her fellow demon hunters, she is stronger than the average person, having gone through training under Shinobu and passing the Final Selection.

Kamado Tanjiro
Aoi and Tanjiro seem to have formed a friendship. Tanjiro respects Aoi for her help and care while he, Inosuke, and Zenitsu resided at the estate. He thanks her for her work and for her assistance, which she seems to appreciate. He also intervenes for her when she was being kidnapped by Uzui, and defends her when Uzui says she isn't useful by saying everyone has their own circumstances. When Tanjiro left the Butterfly Estate, Aoi said she enjoyed their time together.

Kanao Tsuyuri
How close they are is somewhat uncertain, but the two get along and seem to have a somewhat sisterly relationship. Kanao attempts to stop Uzui from taking Aoi with him at a time when it was highly unusual for Kanao to make her own decisions or go against her orders. As seen in the novel, Aoi previously thought of Kanao as difficult to deal with, since she never showed her own emotion. She also felt inferior to Kanao, since Kanao could fight demons and Aoi could not. However, once Kanao starts to open up and make her own decisions, Aoi and her begin to grow closer.

Shinobu Kocho
Shinobu is Aoi's mentor in the field of medicine and likely oversaw some or all of her demon hunter training as well. Aoi thinks highly of Shinobu, like all the other butterfly girls. Shinobu cares for Aoi and feels sympathy for how her family was killed by demons. She also seems to feel some anger on Aoi's behalf, remarking that none of the butterfly girl's families would have been killed if it weren't for demons during her fight with Doma.

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Аой Канзаки