Nezuko

Intro  Family Nezuko is the eldest daughter of the Kamado family, and has an older brother named Tanjiro. She grew up on a mountain with her family, helping with chores around the home and taking care of her younger siblings. Demon attack A demon attack kills almost her entire family, and Muzan Kibutsuji turns Nezuko into a demon. Personality At first, Nezuko is wild and attacks her brother, but she quickly comes to her senses and defends him from Giyu Tomioka. Missing memories Tamayo reveals that Nezuko's missing memories and underdeveloped personality are due to her prioritizing developing her resistance to the sun over regaining her consciousness. Demon Slayer Corps Kyojuro acknowledges Nezuko as a member of the Demon Slayer Corps after she protects the humans on a train. Bamboo in her mouth Guiyu puts bamboo in Nezuko's mouth to keep her from tasting human blood and to suppress the strength of her jaws. also you are a doctor You have to give her a human pill. (Btw Tanjiro is not there)