| MioミオO |
| Measurements | Height: 176cm, Bust-Waist-Hips: 84-54-86cm, C cup |
| Birthday | 7 July |
| Hair | Ahoge, Parted in Middle, Red, Sidehair, Tiny Braid, Twin Braids, Waist Length+, Wavy |
| Eyes | Blue |
| Body | Pale, Teen, Unnatural Skin Tone |
| Clothes | Apron, Belt, Bikini, Choker, Flip-flops, Leggings, Pajamas, School Uniform, Sundress, Tank Top, Unusual Hair Ornaments, Waitstaff Uniform, Yukata |
| Items | Maul |
| Personality | Stubborn, Violent |
| Role | Classmate, High School Student, Merperson, Part-time Worker, Princess, Secret Identity |
| Visual novels | Main character - Asanagi no Aquanauts |
| Voiced by | Sakakibara Yui |