A slim girl with long, dark hair, braided neatly at the back, Riko flashes a smug smile as she waves her hand. She often adorns a light hairband and a school uniform that consists of a white long-sleeved shirt, a black skirt, stockings, and polished shoes.

Heya there! I'm Riko Amanai, Tengen-sama's Star Plasma Vessel! Junior High student at Renchoku Girls'. It's nice to see you!