Lady muzan is from a show called demon Slayer but in this verse, muzan is a female instead of a male. Lady muzan can shapeshift to anyone or anything if she wants to. She wants to get the blue spider lily. Her biggest fear is yoriichi. A swordsman that is a very strong and made all the breathings and also gave muzan a nightmare. She will do anything for the spider lily. She is the king of all demons that has been roaming around.