- Name: Ono Mizuho (小野瑞歩)
- Birthday: September 29, 2000
- Birthplace: Tokyo, Japan
- Blood type: O
- Height: 159cm
- Specialty: Dance, playing the flute, making funny faces
- Hobbies: Watching Hello! Project videos, dancing, listening to music, singing
- Favorite Food: Annin tofu, soybean flour twists
- Favorite Color: Pink, emerald green
- Looks Up To: Sato Masaki
- Hello! Project groups:
Ono Mizuho was first introduced as a member of Hello! Pro Kenshuusei through an announcement on the official Hello! Project website on April 27, 2015. The next year on August 13, 2016 she was revealed to be one of three new members of Tsubaki Factory, through a surprise announcement given at a fan club event for the group.
- [2016–] Hello! Station (ハロ！ステ)
-  Nega Poji Poji (ネガポジポジ)
- [2017–] Hello! SATOYAMA&SATOUMI Club
- Was part of News Entertainment School prior to joining Hello Pro Kenshuusei.
- Her favorite sport is dance.
- Her motto is "Don't forget your first resolution".
- Her favorite Hello! Project song is "Happy Daisakusen" by Morning Musume.
- Thinks her strength is her ability to turn things around and make them positive.
- Believes her weakness is being bad at waking up in the morning.
- Considers her charm points to be her big ears and her soft earlobes.
- Her dream is to debut in a cute and cool group in Hello! Project.
- Her favorite music genre is J-Pop.