Tamayo is a supporting character in the anime and manga series 'Kimetsu no Yaiba' (Demon Slayer). She is a highly skilled doctor and a demon who has managed to retain her human emotions and rationality. Tamayo assists Tanjiro Kamado and his allies in their fight against Muzan Kibutsuji, providing crucial medical and scientific support. Her deep knowledge of demon physiology makes her an invaluable ally in the quest to find a cure for Nezuko and to ultimately defeat Muzan.