- Name: Sakurai Rio (櫻井梨央)
- Nickname: Rairii (らいりぃ)
- Birthdate: November 11, 2005
- Birthplace: Tokyo Japan
- Blood Type: O
- Height: 159cm
- Hobbies: Admiring idols, playing games
- Looks Up To: Kitagawa Rio
- Hello! Project groups:
- Morning Musume (2022–)
Sakurai Rio participated in the "ANGERME ONLY ONE Audition ~Watashi wo Tsukuru no wa Watashi~" in 2020 but failed to pass. She then auditioned for the "Hello! Project "Morning Musume '22" "Juice=Juice" Goudou Shin Member Audition", and on June 29, 2022, she was announced to have passed the final round, becoming a member of Morning Musume. On November 17th, she celebrated her 17th birthday with the event "Morning Musume '22 Sakurai Rio Birthday Event".
- [2022–] Hello! Station (ハロ！ステ)
- She lived in Hyogo for 4 years before moving to Tokyo.
- Her favorite genre of music is J-Pop.
- Her favorite sport is dodgeball.
- Her motto is "There is only progress every day" (日々前進あるのみ; Hibi zenshin aru nomi).
- Favorite foods is curry (butter chicken type).
- Her favorite Morning Musume songs are "Mukidashi de Mukiatte", "Nanchatte Renai", "Seishun Kozou ga Naiteiru", "Kono Mama!", and "Jiyuu na Kuni Dakara".