Riko Amanai  

, 天内 理子

It appears that Riko Amanai is likely a second-year student at Renchoku Girls Junior High School. In 2006, she served as the Star Plasma Vessel for Master Tengen's merger. Tragically, when Riko was just four years old, her parents were involved in a fatal car accident. Since then, Misato Kuroi has been taking care of her.