- Name: Yamazaki Mei (山﨑愛生)
- Nickname: Mei-chan (めいちゃん)
- Birthdate: June 28, 2005
- Birthplace: Sapporo, Hokkaido, Japan
- Blood Type: B
- Height: 158cm
- Specialties: Electone, Eiken English standard level 2-kyu
- Hobbies: Block building, handicraft, collecting panda goods
- Looks Up To: Tsugunaga Momoko, Oda Sakura, Takagi Sayuki
- Hello! Project groups:
Yamazaki Mei auditioned to become a Ciaogirl, a model for Ciao magazine, sometime in 2014. She participated in the "Hello! Project "Hokkaido Gentei" Member Audition" between June and July 2015, and on June 30, 2016 was officially introduced as a member of Hello Pro Kenshuusei Hokkaido during the "Hello! Project 2016 Summer ~Sunshine Parade~" concert in Sapporo, alongside Oota Haruka, Satou Hikari, Ishiguri Kanami, Kawano Minori, Kitagawa Ryou, and Kudou Yume.
On May 6, 2018 at the "Hello! Project Kenshuusei Happyoukai 2018 ~Haru no Koukai Jitsuryoku Shindan Test~" event Mei recieved the Judges singing award for her performance of Juice=Juice's "Wonderful World (English Ver.)". The following year on May 4, 2019 at the "Hello! Project Kenshuusei Happyoukai 2019 ~Haru no Koukai Jitsuryoku Shindan Test~" event Mei was awarded the Judges character award for a performance of °C-ute's "Mugen Climax". Three months later on June 22nd she was revealed as one of three 15th generation members of Morning Musume, alongside "Morning Musume '19 LOVE Audition " audition winners Kitagawa Rio and Okamura Homare. Their first live appearances would take place during the Hello! Project Summer 2019 concert series, and regular activities would begin with Morning Musume's Autumn 2019 concert tour.
- [2020.06.12] Mei
- [2021.07.09] Morning Musume. 15ki OFFICIALBOOK2019-2021 (モーニング娘。15期 OFFICIALBOOK2019-2021) (Kitagawa Rio, Okamura Homare, Yamazaki Mei)
- [2019–] Hello! Station (ハロ！ステ)
-  Hello Pro Kouhaku Taiko THE☆BATTLE 2019 (ハロプロ紅白対抗 ザ☆バトル2019)
- [2019–2020] Hello Pro ONExONE (ハロプロ ONE×ONE)
-  Hello Pro no Oshigoto Challenge! 2 (ハロプロのお仕事チャレンジ!2)
-  AVIOT TE-D01q Wireless Earbuds
- [2016–2019] Hello! to meet you!
- [2019–] Morning Musume no Morning Jogakuin ~Houkago Meeting~ (モーニング娘。のモーニング女学院～放課後ミーティング～)
- Has been learning English through the Disney's World of English language learning program since she was 9 months old.
- Her favorite genre of music is J-Pop, mainly idol songs.
- Her favorite sports are jump rope, mat exercise, and dance.
- Her favorite school subject is arts and crafts.
- Her motto is "Keep on trying".
- Favorite foods are curry and pan no mimi (パンのみみ; bread ears, the crusts and heels)
- Favorite colors are purple and light blue.
- Thinks her charm point is English listening.
- Decided to enter the Hello! Project "Hokkaido Gentei" Member Audition because her mother is a big fan of Hello! Project, and she'd wanted to become an idol since she was small.
- Her dream is to appear on national television and give a performance that reaches everyone.
- During her first interview as a member of Morning Musume she stated her desire was to be able to learn dance routines faster and better.
- Holds a pre-2 grade (high school level) on the Eiken English-proficiency exam.
- Her favorite Hello! Project songs are "Wakatteiru no ni Gomen ne" by Country Girls, "Ai Araba IT'S ALL RIGHT" and "Joshi Kashimashi Monogatari" by Morning Musume, "Chokotto LOVE by Pucchimoni, "Ooki na Ai de Motenashite" by °C-ute, and "Tsugitsugi Zokuzoku" by ANGERME.