Mayuri is a teenager with long, straight black hair and black eyes. She wears the Satsukiyama Academy school uniform consisting of a brown double-breasted jacket, a white sailor shirt with a black trim, and black skirt with knee-length black socks and black loafers. She is also wearing a leash choker around her neck.
Mayuri transferred to Satsukiyama Academy a year before the events depicted in the manga. She is an upperclassman who is in the same class as Tamaki. Mayuri has an interest in parapsychology and the supernatural and would often talk about it in class.
She is not the least bit phased about ending up in Heavenly Host and talking to a ghost. Quite on the contrary, the situation seems to amuse her.