Kanao Tsuyuri

Race
Human
Gender
Female
Age
16
Height
156 cm (5'1½")
Weight
46 kg (101 lb)
Birthday
May 19th
Hair Color
Raven-Black
Raven-Black to Pink (From Infinity Castle Arc)
Eye Color
Purple
Affiliation
Demon Slayer Corps (Formerly)
Occupation
Demon Slayer
Tsuguko
Doctor (Post-War)
Combat Style
Flower Breathing
Base of Operations
Butterfly Mansion
She became unable to make decisions by herself and repressed her emotions as a defense mechanism. In order to help rectify this, Kanae Kocho gave her a coin to flip to decide which path to follow when she didn't know what to do.
For many years, Kanao continued to show little emotion or desire. Despite this, after seeing what demons did to Aoi Kanzaki, Kiyo Terauchi and Shinobu Kocho's loved ones, Kanao developed a strong hatred against demons directly from her own will. Shinobu, oblivious to this fact, was afraid that she wasn't acting on her own volition.
Since Kanao couldn't do housework and nursing at the Butterfly Mansion like her colleagues, she opted to be a Demon Slayer. Without their knowledge, Kanao learned Flower Breathing by watching her sister Kanae.
Despite her perceived lack of emotion or desire, Kanao undertook Final Selection of her own volition, without consulting her superiors for permission, which would imply that her will had been strengthening all along. Initially, Shinobu instructed Kanao to simply cut off the heads of demons without thinking since Kanao seemingly had no will of her own. However, Kanao also eventually developed her own desire to fight.
Between Kanae's death and the events during Rehabilitation Training, she recovers slightly but still relies on her coin to make decisions. She displays a somewhat mechanical response in conversations; when Tanjiro Kamado approaches her to bid to her farewell, she repeats "goodbye" when he attempts to continue the conversation.