- Name: Kitagawa Rio (北川莉央)
- Nickname: Kitario (きたりお)
- Birthdate: March 16, 2004
- Birthplace: Tokyo, Japan
- Blood Type: O
- Height: 155cm
- Specialties: STEP Eiken English Test grade 3, Pken ICT Proficiency Assessment Test grade 4, flute
- Hobbies: Cooking, looking for pretty girls, reading magazines, karaoke
- Looks Up To: Oda Sakura, Kaga Kaede
- Hello! Project groups:
- Morning Musume (2019–)
Kitagawa Rio was selected from the "Morning Musume '19 LOVE Audition" audition to become a 15th generation member of Morning Musume. She was first revealed as a member, alongside fellow audition winner Okamura Homare and Hello Pro Kenshuusei Hokkaido member Yamazaki Mei, on June 22, 2019 during a special livestream on the Morning Musume YouTube channel. Their first live appearances would take place during the Hello! Project Summer 2019 concert series, and regular activities would begin with Morning Musume's Autumn 2019 concert tour.
- [2020.11.12] First Time
- [2021.11.06] Rio 17th summer (莉央 17th summer)
- [2021.07.09] Morning Musume. 15ki OFFICIALBOOK2019-2021 (モーニング娘。15期 OFFICIALBOOK2019-2021) (Kitagawa Rio, Okamura Homare, Yamazaki Mei)
- [2019–] Hello! Station (ハロ！ステ)
-  Hello Pro Kouhaku Taiko THE☆BATTLE 2019 (ハロプロ紅白対抗 ザ☆バトル2019)
- [2019–2020] Hello Pro ONExONE (ハロプロ ONE×ONE)
-  Hello Pro no Oshigoto Challenge! 2 (ハロプロのお仕事チャレンジ!2)
-  Hello Pro no Collabo NIGHT! (ハロプロのコラボNIGHT!)
-  AVIOT TE-D01q Wireless Earbuds
- [2019–] Morning Musume no Morning Jogakuin ~Houkago Meeting~ (モーニング娘。のモーニング女学院～放課後ミーティング～)
- She's generally bad at athletics, but enjoys golf; her best score is 98 (as of June 2019).
- Wanted to work in the entertainment industry for eight years before joining Hello! Project.
- She auditioned for Morning Musume after her piano teacher, a fan, recommended the audition.
- She loves water; her favorite water bottle brand is Volvic.
- Stated upon her introduction that she most wanted to sing Oda Sakura's solo part in "Help me!!".
- During her first interview as a member of Morning Musume she stated her desire was to be able to keep up and perform well despite not having much experience.
- Holds a grade 3 rating (junior high school level) on the Eiken English-proficiency exam, and a grade 4 rating on the Pken computer proficiency exam.
- Her favorite genre of music is J-Pop idol music.
- Her motto is "Doryoku no bun dake onna no ko wa kawaiku nareru" (努力の分だけ女の子は可愛くなれる; A girl can be cute with some effort)
- Began supporting female idols in fifth grade, after becoming a fan of K-Pop group Girls' Generation.
- Wrote "Mizunomi Baba" (水飲みババア; Water-Drinking Grandma) as her nickname on the Morning Musume '19 LOVE Audition application. The name came from her classmates thinking she resembled an old woman when they saw her in pain and drinking everyone's extra water after a school sports festival.
- She likes very spicy foods and dishes.
- Her favorite Morning Musume song is "Ai no Gundan".