エイダ＝クローバー

Ada is the older sister of Carl and the daughter of Relius. Due to one of her father's experiments, she was turned into the Nox Nyctores, Nirvana. One day, for reasons unknown, she agreed to become the subject of one of her father's experiments, although it is possible she was either forced or deceived into doing so. As a result, her body was fused into the Nox Nyctores known as Nirvana. Unfortunately, Carl bore witness to the experiment and now seeks out his father in order to get revenge. Nirvana follows him now as his partner and weapon, acting upon his commands and protecting him.

Before becoming a doll, Ada was a kind, calm, and cheerful person. She was always very kind to her younger brother. Due to her affection, Carl idolized her, and frequently spoke highly of her to his friends at school (much to their amusement). Supposedly, she is also a bit self-conscious about her appearance. After becoming a doll, she becomes lifeless but shows unusually high sentience, protecting Carl from anything that would be a threat to him sometimes without any provocation.