- Birth Name: Toyonaga Aki (豊永阿紀)
- Nickname: Aki (あき)
- Date of Birth: October 25, 1999
- Place of Birth: Fukuoka, Japan
- Blood Type: B
- Height: 158cm
- Bands / Groups:
HKT48 Song Participation
- Hakusen no Uchigawa de ("Bugtte Iijan") (4th Generation)
- Kiss ga Toosugiru yo ("Bugtte Iijan") (Diamond Girls)
- HKT48 Family ("Bugtte Iijan")
- Currently a fourth generation member of HKT48 Kenkyuusei.
- Her favorite colors are yellow, orange, pink and purple.
- A year before joining HKT48, she was one of six finalists out of 15,000 people in a talent reality show called The Last Heroine. The show consisted of dancing, singing, and acting and ran for 24 episodes on Tokai TV, produced by SME and KYORAKU Yoshimoto. Toyonaga did not win, but she took part in multiple photoshoots, a small play, and a fashion show in the wake of the competition.