Kojou's daughter who's responsible for sending Reina 20 years back to the past. It states in the side-story that she's Kojou and Asagi's daughter.

Most color traits in her are based on Color Mixings. Her hair is green from Asagi's yellow/blonde hair and Kojou's Blue hair; her violet eyes from Asagi's red eyes and Kojou's blue eyes. She is also Reina's half sister.

(Source: Strike the Blood Wikia)