Koya Chachako
小屋 茶々子
| Koya Chachako小屋 茶々子 | |
| Hair | Ahoge, Brown, Short |
| Eyes | Green, Tareme |
| Body | Furry Tail, Kemonomimi, Pale, Slim, Teen |
| Clothes | Cravat, Hat, Knee-high Socks, Miniskirt, Old Type School Swimsuit, Sandals, School Uniform, Sundress |
| Personality | Energetic, Kind, Naive |
| Role | Dog, High School Student |
| Visual novels | Main character - Otomimi ∞ Infinity |
| Voiced by | Chatani Yasura |