Onodera Mari
小野寺 鞠
| Onodera Mari小野寺 鞠 | |
| Hair | Long, Pink, Sidehair, Twin Tails, V Bangs |
| Eyes | Pink, Tareme |
| Body | Pale, Slim, Teen |
| Clothes | High Heels, Jacket, Miniskirt, Ribbon Hair Tie, Sailor School Uniform, Shirt, Thigh-high Stockings |
| Personality | Brother Complex, Deredere, Energetic, Immature, Sweets Lover |
| Role | Full Sister, High School Student, Kouhai, Younger Sister |
| Engages in | Flirting, Teasing |
| Visual novels | Main character - Mousou Complete! |
| Voiced by | Yuina |