|Birthdate||November 16, 1997|
|Current Age||25 Years Old|
|Agency||Setouchi Co. Ltd.|
|Social Networks||SHOWROOM / Twitter|
|Idol Career Info|
|Debuted||October 2019 / 2nd Generation|
Osaki Serika is a member of STU48's 2nd Generation and MiKER!.
- SHOWROOM Audition Number: #98
- Hobbies: Research hairstyles and makeup that suit her, Watching idols, eat local soft serve ice cream, take 20,000 steps a day
- Special skills: Laundry, 50m run, Kendama while riding a unicycle
- Shoe size: 24cm
- Admired members: Komada Hiroka and Toyonaga Aki
- Admired STU48 members: Nakamura Mai and Oki Yuka
- Favorite AKB48 Group song: Hoshizora no Mistake
- Favorite Food: Inahoyaki
- A place you'd like to visit in Setouchi: Itsukushima Temple
- Pros: Assertiveness.
- Cons: Tendency to be extreme
- Oldest STU48 2nd Generation member
- Dream for the future: To get more people to like STU48 and to become an indispensable part of the group.
- Her first audition was AKB48 1st Draft Kaigi. Since then she had auditioned several times for several groups for 6 years before getting into STU48
- Is part of the unofficial unit Takasaki Ayako with Takao Sayaka, Suzuki Ayaka, and Kojima Aiko. They are the most mature members in the 2nd generation and have been close friends since they first joined.
- On October 12, passed the auditions for STU48's 2nd Generation.
- On October 27, joined STU48.
- On October 1st, was promoted to STU48 2nd Generation.
- STU48 Kenkyuusei → STU48 2nd Generation
- Joined STU48 as a Kenkyuusei on October 27, 2019
- Promoted to STU48 2nd Generation on October 1, 2021
- Bokura no Shunkashuutou (Mubou na Yume wa Sameru Koto ga Nai)
- Kokai Nanka Aru Wakenai (Hetaretachi yo)
- Fune Kara Orita Bokutachi wa... (Hana wa Dare no Mono?)
- Egao no Chance (Iki wo Suru Kokoro)