- Birth Name: Hiwatashi Yui (樋渡結依)
- Nicknames: Hiiwatan (ひーわたん), Yuipon (ゆいぽん)
- Date of Birth: April 30, 2000
- Place of Birth: Saitama, Japan
- Blood Type: A
- Height: 151cm
- Bands / Groups:
AKB48 Song Participation
|Kimi wa Melody||M.T. ni Sasagu||Yokoyama Team A|
|Tsubasa wa Iranai||Tsubasa wa Iranai|
|Set me free||Team A|
|High Tension||Osaekirenai Shoudou||Waiting Circle|
|Shoot Sign||Accident Chuu||AKB48 U-19 Senbatsu|
|Negaigoto no Mochigusare||Maebure|
|#SukiNanda||Tsuki no Kamen||Upcoming Girls|
|11gatsu no Anklet||Houtei Sokudo to Yuuetsukan||U-17 Senbatsu|
|Bokutachi wa, Ano Hi no Yoake wo Shitteiru||Tengoku no Kakurega|
- Romance Kakurenbo (Zensa Girl solo)
- "Nankin Tamasudare"
- Originally a candidate for the 2nd AKB48 Group Draft, she was drafted by AKB48 Team A in the first round and remained in Kenkyuusei until she was promoted to Team A on February 10, 2016.
- Hobbies: Watching TV, impersonations.
- Special Skill: Drums
- Likes talking to people.
- Says to be clumsy.
- Prior to AKB48, she was a former child actress and a member of Karat☆ from 2013 to 2014.
- She appears, alongside Takahashi Minami, in the 2008 drama SAITOU-san.
- Admires Watanabe Miyuki and Shimazaki Haruka.