Diana Tsukiyomi(Tsukiyomi Diana): Diana is Rei's mother and the ex-wife of Daiichi Tsukiyomi. She would force Rei to compete in beauty pageants. When Rei received her first bike from her father, Diana said Rei was turning into a tomboy and didn't want a kid like her, and threw Rei's bike in the trash. Rei slapped her and yelled at her. Diana left the next day, and Rei hasn't seen her since.