Mio Kusakai is a side character in the series Keijo!!!!!!!!. Upon graduating from Setouchi, Mio officially becomes a B-Rank Keijo player. Sometime later, she is able to advance to the A-Rank. She is also very carefree and is still able to think well under pressure. Even when she is being taunted by her opponent, Mio only responses by laughing, or even flirting with them instead.
- She will tease each girl around her, and talk about dragging them into bed.
- At her first meeting with Nozomi Kaminashi, she gazed at her body before hugging her saying that she's her type, then grabbed her butt.
- Her favorite thing is having fun with cute girls.
- Her wish is to have a harem party with all of the Keijo competitors including Kazane Aoba.
- Kazane's coming at her so hard is making her hot.
- She won the Keijo competition by pushing her breasts against Kazane's, after she hypnotized her and her team members with her breasts swaying movement.
- She was born on October 12.