Role: White-haired onmyouji Height: 145 cm A person of many mysteries who has a dignified presence. Her sword at the waist is 2 shaku 7 sun long (~81 cm). Left eye is constantly closed. Age and gender are unknown.

Spoiler

In Kohaku's route in VN Aoi Shiro was confirmed that she is female. She had twin-brother who had the same appearance but he was killed long time ago. Kohaku is at least couple of hundreds years old but she slept most of this time