Sayuri is the mother of Kinnikuman, wife of Mayumi Kinniku, and the 57th Queen of Planet Kinniku. She has the katakana that read "Mama"(ママMama) written on her forehead. She is usually depicted as a typical long-suffering, loving mother character, but she has been known to transform into a violent fan during her sons matches, even to the point of using her husband to show Kinnikuman which moves to use. She has the ability to grow large liker her son, as evident from the time she masqueraded as him in order to fight Kaijuu and redeem his image. In the anime, she is very jealous of Mari, because Kinnikuman takes more attention on his love interest than his mother.