Aoi Kanzaki,

Behavior: Aoi is often seen as tough, uncompromising, and efficient in her duties at the Butterfly Mansion. She doesn't smile much and tends to express her emotions, such as anger or frustration, very clearly and openly. Her serious and justice-focused attitude resembles Giyuu Tomioka and a younger version of Shinobu Kocho. Inner feelings: Despite her gruff appearance and volatile temperament, Aoi is, deep down, kind and caring. She goes to great lengths to help injured Demon Slayers recover and expresses tender emotions at specific moments, such as when she cried out of concern for Inosuke Hashibira's injuries or expressed satisfaction with the time spent with the main trio at the mansion. Insecurity: She feels insecure about not being an active Demon Hunter, believing that her survival in the Final Selection was pure luck and that her work as an assistant is not as valuable as fighting on the front lines.

Physical appearance: She is a young woman of average height and fair skin. Face: She has large, deep-set eyes, a dark blue that fades to a lighter blue at the bottom, with rectangular white pupils. Her eyebrows are dark, thin, and arched, often furrowed, as she usually displays a serious or frowning expression. Hair: She has straight black hair with bangs parted in the middle and styled in two pigtails. She uses two butterfly-shaped hair clips, white with blue edges and turquoise spots, to keep her hairstyle in place. Clothing: She wears the standard Demon Slayer uniform, which has a slightly bluish tone. Over the uniform, she wears a white nurse's dress with a blue sash at the waist. The uniform consists of a button-down jacket with a high collar and long sleeves, with silver buttons and the kanji for "Destroy".

Skills: Although she doesn't fight in direct battles, she possesses extensive medical knowledge, likely taught by Shinobu Kocho, the Insect Hashira.

Background: Her family was killed by demons, leading her to join the Demon Slayer Corps. She survived the Final Selection, but her fear of fighting caused her to take on a support role.

A modern feudal Japan, haunted by carnivorous demons (Oni) that emerge at night, fought by the Demon Slayer Corps (Kisatsutai), which uses breathing techniques and special steel swords to exterminate them, with the protagonist...