- Name: Eguchi Saya (江口紗耶)
- Birthday: August 1, 2003
- Birthplace: Hyogo, Japan
- Blood Type: O
- Specialty: Dance, piano, back bridge
- Hobbies: Playing musical instruments, singing songs
- Looks Up To: Suzuki Airi
- Hello! Project groups:
- Hello! Pro Kenshuusei (2017–)
- Made her first live appearance at the "Hello Pro Kenshuusei Happyoukai 2017 3gatsu ~Marching!~" event on March 11, 2017.
- Her favorite genres of music are J-Pop and western music.
- Favorite sports are tennis and badminton.
- Favorite foods are macaroons and mont blanc.
- Her motto is "Hard work opens all doors."
- Thinks her charm point is her long curled eyelashes.
- Her favorite school subject is physical education.
- She can dance the samba.