- Name: Adachi Reina (安達玲奈)
- Nickname: Reina-chin (れいなちん)
- Birthdate: August 7, 2002
- Birthplace: Aichi, Japan
- Blood Type: A
- Height: 167.5cm
- Hobbies: Traveling, watching comedies
- Specialties: Japanese dance, baton, gorilla imitation, mental arithmetic, song of the 15th Tokugawa Shogun
- Group Color: Orange
- Bands / Groups:
- She had her official debut as a ninth generation Kenkyuusei member on December 31, 2018 at the SKE48 theater. She resigned from the group on January 4, 2019 due to her school forbidding the participation in show business activities.
- Her favorite color is pink.
- Her future dreams are entering SKE48, appearing on variety programming, and acting.
- Her favorite foods are hot food, sour food, and uni.
- Her favorite words are "jikan wa isshun" (時間は一瞬) and "deai wa isshou" (出会いは一生).
- Her message is "I will cherish every minute and second that I can work on SKE48, and I will make every effort to do my very best! I would like to challenge a lot of things so that you can have fun with handshake meetings and more. Thank you." (SKE48で活動できる１分１秒を大切にして、精一杯努力していきます！握手会などで楽しんでいただけるように、たくさんのことにチャレンジしていきたいと思います。よろしくお願いします。)