Shimizu Riko (清水理子) is a soloist, a member of Niji no Conquistador and a former member of 81moment. She graduated from 81moment on 29 April 2016. She then joined Niji no Conquistador on 18 May 2016 as a research student, and was promoted on 9 January 2017.

Nicknames: Rikopin (りこぴん), Shimiko (しみこ), Hijigami (肘神)

Hometown: Wakayama Prefecture

Height: 167 cm

Hobbies: Pokémon cards, board games, murder mystery, werewolf, mahjong

Special Skill: Singing, puns

Image Color: Red