- Stage Name: AleXa (알렉사)
- Real Name: Alex Christine Schneiderman
- Korean Name: Kim Seri (김세리)
- Birthdate: December 9, 1996
- Birthplace: Oklahoma, USA
- Height: 150cm
- Weight: 42kg
- Hobbies: Writing, photography
- Specialties: Modern Dance, ballet, jazz dance, acrobatic
- Official Fanclub: A.I Trooper
- She was the winner of Soompi's "Rising Legends Season 2".
- She trained for two years and 11 months prior to her appearance on Produce 48.
- She is half Russian and half Korean.
- [2020.04.01] Do Or Die
- [2019.10.21] Bomb
- [2019.12.13] Bomb (Rock Ver.)
- [2020.03.06] A.I TROOPER
- [2020.03.06] Do Or Die
- [2020.05.01] Millenasia Project 'Be the Future' (Dreamcatcher, AleXa, IN2IT)
-  Produce 48