- Elfriede is Kinkell's daughter and servant and is able to summon creatures and monsters. She is a Ludo, a human who was converted into a vampire, and is truly Kinkell's biological daughter as well as his daughter in terms of vampire propagation by being bitten. Due to his cruelty to her adopted family when she was converted, she swore to avenge them. Kinkell's control over her was nullified when she fed on Kouhei's blood which is how she was able to aid him and Hazuki in destroying Kinkell. After Kinkell was defeated, she joined the Midou household and helps protect Hazuki from other vampires and their minions. Being close in chronological age to Rhyuuhei (although looking much younger), she quickly forms a relationship with him, possibly becoming romantically attracted to him.