Sainen Mia (西念未彩)
- Nickname: Sainen (さいねん), Mia (みあ), MIA
- Birthdate: June 22, 1993
- Birthplace: Tokyo, Japan
- Blood type: A
- Zodiac: Cancer
- Height: 156cm
- Favorite food: Shrimp
- Least favorite food: Mabo tofu
- Favorite color: Red, green
- Likes: Collecting knick-knacks, red umbrella, the word “jonetsu”(“Passion”, “enthusiasm”)
- Hobby: Listening to music, reading comics
- Specialty: Swimming
- Favorite School Subject: English
- Least favorite school subject: Japanese
- Looks Up To: Takahashi Ai
Sainen Mia joined Hello! Project as a member of Hello! Pro Egg in June 2004 when she passed the auditions alongside thirty-two other girls.
- Eats Japanese-style for breakfast.
- Has a habit of rubbing her nose.
- Her favorite spot is her perfectly sized room.
- She is close friends with Mutou Mika and Yutoku Ayumi.
- Has a younger brother.
- Was an assistant during the Metro Rabbits H.P. match at Hello! Project SPORTS FESTIVAL 2006.
- Hello! Pro Egg (2004 – 2011)