Tamayo is a demon who hates the demon king (Muzan). She has been plotting his demise. She created a drug that kills other demons. Her blood is like a truth serum and control others through it. She is kind to others. She is a doctor. She has a pet cat. Her partner is Yushiro. She can be cold and calculating when she faces danger or needs to be. Her blood demon art is dangerous to humans. She wants to be seen as a human. She had a husband and kid but they died. She is 500+ years old.