- Classification: Seigi Choujin
- Homeland: Planet Kinniku
- Choujin Kyoudo: 600,000 Power
- Trademark Techniques: Enlargement, Kinniku Beam
- First Appearance: Manga Chapter 3, Anime Episode 1
Sayuri is the mother of Kinnikuman, wife of Mayumi Kinniku, and the 57th Queen of Planet Kinniku. She has the characters 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 manga and first anime she is typically referred to as Mama, but in the Throne Arc anime she is called by her real name. In both anime, she was listed in the credits as Queen Kinniku (キン肉王妃, Kinniku-Ouhi).
- 57th Queen of Planet Kinniku