Momonoi Riko

 (桃ノ井理子) is a Japanese idol, a member of Sayonara Stay Tuned, and a former member of KUUSO CALIBRATION; Zero Project and units Zero Project Senbatsu, Z5-B2 and Z4-B4 (as Kato Rico (加藤理子)); and Up Up Girls (2) (as Hashimura Riko (橋村理子)).

She joined Up Up Girls (2) as a first generation member on February 25, 2017, and graduated on July 29, 2019, to study fashion design.

She was dismissed from Zero Project on March 8, 2022 alongside Shirosaki Matsuri due to a serious breach in contract regarding inappropriate behavior. She was also originally going to be a part of the Z3 Senbatsu line-up.

Zero Project

 * Zero Project Registration Number: 1027
 * Zero Project Registration Date: July 1, 2021
 * Hobbies: Karaoke, singing while hula-hooping, baking bread and desserts, and drawing pictures
 * Special Skills: Cooking
 *  Dominant Hand: Right
 * Favorite Color: Pink
 * Favorite Idol: Tanaka Reina
 * Charm Point: Smile
 * Eastern Zodiac: Rabbit
 * Up Up Girls (2) Audition Song: YOLO

KUUSO CALIBRATION

 * Hobbies: Looking at cute things and going shopping for clothes
 * Special Skills: Making clothes and drawing
 * Dream: Costume designer

Zero Project Group History

 * Z5-B2 (Formation -> November 5, 2021)
 * Zero Project Senbatsu (November 21, 2021 -> March 5, 2022)
 * Z4-B4 (November 21, 2021 -> March 5, 2022)

Trivia

 * She was born on the same day as former Hello Pro Egg member Muto Mika.
 * She considered herself Up Up Girls (2)'s girl power representative.
 * She called herself "The world's cutest Rikko" (世界一可愛いりっこ).
 * She likes drawing, especially pictures of idols, and often posted her drawings on Twitter.
 * Her Up Up Girls (2) audition number was #14.