- Name: Doi Rena (土居麗菜)
- Nickname: Dui (どぅい), Doichan (土居ちゃん)
- Birthday: September 1, 2004
- Birthplace: Osaka, Japan
- Blood Type: A
- Height: 156cm
- Specialty: Folding small paper cranes
- Hobbies: Listening to Hello! Project songs
- Looks Up To: Makino Maria, Kishimoto Yumeno
- 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 genre of music is J-Pop.
- Favorite sport is badminton.
- Favorite food is croquettes made by her mother and salmon roe.
- Her favorite color is yellow.
- Her motto is "If you try to stick to what you're doing, you can do things you didn't think you could." (なせば成るなさねば成らぬ何事も)
- Thinks her charm point is her long fluffy eyelashes.
- Her favorite school subject is Japanese.
- She's a member of the brass band at school where she plays the contrabass.
- Her parents bought her an electric bass guitar because she enjoys the sound of the contrabass.
- Dislikes tomatoes.
- Thinks her shortcoming is being slow-footed.