Yokoo Rio (横尾莉緒) is a Japanese idol, a founding member Loulouchouchou, and a former member of Aficionado deux (as Yokoo Yuuhi; 横尾有柊), Kamu Kamu Vampire, KissBeeYouth, Yoyogi Joshi Ongakuin, and NICE GIRL Project! Kenshuusei.
She joined NICE GIRL Project! Kenshuusei on June 2, 2014 and remained with the program until it was dissolved on November 16, 2014.
She joined Yoyogi Joshi Ongakuin in March 2017 and graduated in March 2019.
She then joined KissBeeYouth on October 26, 2019. She was promoted to Kamu Kamu Vampire in December 2020, and remained with the group until their disbandment.
She joined Aficionado deux February 19, 2022 under her new stage name of Yokoo Yuuhi. She graduated from the group on September 6, 2022.
She debuted as a founding member of Loulouchouchou, returning to her previous stage name, on October 9, 2022. She will graduate on May 23, 2025.
