| Full Name: Nagisa Sayaka |
| Ranger Designation: Change Mermaid |
| Nagisa was previously a task force officer in the Japanese Army before becoming Change Mermaid. She is the team's strategist, and sometimes focuses too much on the etiquette of her fellow Changemen. However, Nagisa has a loving and caring aspect of her seen in animals and her feelings for Tsurugi. |