Otsuka Aina (大塚愛菜) is an independent idol. She was previously a member of Hello! Project as a member of Hello! Pro Kenshuusei and Juice=Juice. She was first introduced at the Hello! Pro Egg Kakikyuuka Mae Special! ~Shinjin-san!? Irassha~i!~ event in July 2011.
- Name: Otsuka Aina (大塚愛菜)
- Nickname: Tsukapon (つかぽん)
- Birthday: April 3, 1998
- Birthplace: Tokyo, Japan
- Blood type: A
- Height: 154cm
- Specialty: Golf, soccer, cooking
- Hobby: Playing sports, listening to music, dancing
- Favorite Food: Grapes
- Looks Up To: Okai Chisato, Natsuyaki Miyabi
- Hello! Project groups:
- [2015.11.29] Dreamer (Indie)
-  Hello Pro Kenshuusei no Tadaima Kenshuuchuu! (ハロプロ研修生のただ今研修中!)
-  Seven Friends, Seven Minutes (セブンフレンズ・セブンミニッツ)
- She auditioned for Morning Musume with °C-ute's song "EVERYDAY Zekkouchou!!" during the 2010 9th Generation auditions. She made it to the final round, but was not chosen as a winner.
- She participated in the 2011 S/mileage audition after becoming a member of Hello! Pro Kenshuusei.
- She has been playing golf since first grade, and has confidence in sports.
- On a rainy day she would enjoy the morning freely, and rehearse Hello! Project dances in the afternoon.
- She would sing the song "Yes! all my family" by °C-ute on a rainy day.
- She is a fan of Hello! Project groups °C-ute and Morning Musume.
- She has been a back dancer for Mano Erina and S/mileage.
- Wants to try bungee jumping at an amusement park.
- Her closest friend within Hello! Pro Kenshuusei was Mogi Minami.
- She participated in the Morning Musume 11th Generation ~Suppin Utahime~ Audition, but failed.
- Her best sports are golf and soccer.
- Became a fan of Hello! Project after seeing the PV for °C-ute's song "Tokaikko Junjou".
- Said her favorite Hello! Project song is "Otakebi Boy WAO!" by Berryz Kobo.
- She's in the drama club at school.
- Withdrew from Juice=Juice and Hello! Project on July 5, 2013 due to contractual issues that were unable to be resolved with her family.