Oosawa Yumiko
大沢 由美子
| Oosawa Yumiko大沢 由美子 | |
| Hair | Brown, Intake, Long |
| Eyes | Tareme, Violet |
| Clothes | Glasses, Lab Coat, Miniskirt, Thigh-high Stockings |
| Visual novels | Side character - Machine Maiden Side character - Machine Maiden Gaiden ~Cynthia~ |
| Voiced by | Shinruu Karin |