|Birthdate||March 16, 2001|
|Current Age||22 Years Old|
|Social Networks||Blog / Instagram / SHOWROOM / Twitter|
|Idol Career Info|
|Debuted||November 2019 / 10th Generation|
Nishii Mio is a member of SKE48's Team KII.
- SHOWROOM Audition Number: #9
- Hobbies: Watching idols
- Special skills: Serious face, painting
- Future dream: Live abroad
- Favorite food: Toro salmon
- Favorite word: Wakarankedo (I don't know), Kawachii (cute)
- A short message: I'll do my best.
- She failed HKT48's 5th Generation and SKE48's 9th Generation Auditions
- She would like to live abroad in the future.
- Auditioned for HKT48's 5th Generation, but failed the audition.
- Auditioned for SKE48's 9th Generation, but failed the audition.
- Joined SKE48 as a member of its 10th Generation.
- On January 15th, was part of her first song, Nagisa no Image, on SKE48's 26th single, So~Yu~Toko Aru Yo Ne?.
- On February 3rd, was part of her first senbatsu, for SKE48's 27th single Koi Ochi Flag.
- On December 19th, promoted to Team KII.
- SKE48 Kenkyuusei → Team KII
- Joined SKE48 as a Kenkyuusei on November 19, 2019
- Promoted to Team KII on January 15, 2022 (Announcement: December 19, 2021)
- Nagisa no Image (So~Yu~Toko Aru Yo Ne?)
- Sekai no Superhero (Ano Koro no Kimi wo Mitsuketa)
- Janai Romantic (Kokoro ni Flower)
- New Ager (Zettai Inspiration)
- KII6 (Saishuu Bell ga Naru)
- Hatsukoi Dorobou
- 20nin Shimai no Uta
- RS6 (We're Growing Up)
- Usotsuki na Dachou
SKE48 Chousedai Concert 2022
- Yaban na Kyuuai (Duet with Shinohara Kyoka)