Kojima Karin is a member of NMB48. She is also a member of Kyunmart.
- 2016.06.28 - Joined NMB48 as a Kenkyuusei
- 2017.10.12 - Promoted to Team N during the final of NMB48's Arena Tour 2017
- 2019.03.01 - Transferred to Team BII (NMB48 Dai Sokaku)
- 2021.01.21 - Transferred to NMB48 Promoted Members
AKB48 Senbatsu Elections
- Boku Datte naichau yo
- Tokonoma Seiza Musume
- Bokou e Kaere!
- Hatsukoi Shijo Shugi
- Datte Datte Datte
- Koi Nanka No thank you!
- Shidare Yanagi
- Taiyou ga Sakamichi wo Noboru Koro (Boku Igai no Dareka)
- Doko ka de Kiss wo (Warota People)
- Hankyuu Densha (Yokubomono)
- Usotsuki Machine (Boku Datte naichau yo)
- Update (Tokonoma Seiza Musume)
- 2 ban-me no Door (Tokonoma Seiza Musume)
- Jugon wa Jugon (Bokou e Kaere!)
- Yasashisa no Inazuma (Bokou e Kaere!)
- Bugendai Knock (Hatsukoi Shijo Shugi)
- Be happy (Datte Datte Datte) (Center)
- Seishun Nenbutsu (Koi Nanka No thank you!)
- Otoshiana (Shidare Yanagi)
- Erabareshi Monotachi (Shidare Yanagi) (WCenter with Shibuya Nagisa)
- Namba Ai (Namba Ai ～Ima, Omou Koto～)
- BII5 (2 ban-me no Door)
- Cross (Center)
Murase Sae Graduation Concert ～Happy Saepy Ending～
- Since November 4, 2018 she is the general captain of NMB48, chosen by Yamamoto Sayaka.
- Favourite Food: Wagashi (traditional japanese sweets), ice cream
- Hobbies: Nail, watching movie dramas
- Special Skills: Baton twirling, talking about NMB48
- Future dream: Producing actress and idol
- A big fan of NMB48 prior to joining the group.
- First native (auditioned) NMB48 member to be from Saitama Prefecture.