Tamayo

Tamayo is a major supporting character in Demon Slayer: Kimetsu no Yaiba.

She is a demon who has broken free from Muzan's control and now lives peacefully while working to help humanity. Unlike most demons, Tamayo no longer consumes human flesh; instead, she survives by drinking small amounts of human blood that patients voluntarily donate to her.

Key points about her:

• She is a skilled physician and researcher who has lived for centuries.
• She specializes in creating medicines and treatments, including drugs that can weaken demons or suppress Muzan's influence.
• She has a gentle, calm, and compassionate personality.
• She is almost always accompanied by Yushiro, a young demon she created and who is fiercely protective of her.
• She becomes an important ally to Tanjiro, providing medical assistance, information about demons, and later developing treatments crucial in the fight against Muzan.

Tamayo represents one of the very rare examples of a "good" demon in the series and plays a significant role in the story's later arcs.