Senbi Orishu

Senbi Orishu is a pureblood vampire who became a Vampire Hunter and trained under Kaien Cross. He is first seen as a mathematics teacher for the Day Class, but when Hanabusa Aido drinks Yuki's blood he intervenes and reveals to Yuki that he is a Vampire Hunter. After Yuki is reawakened as a pureblood vampire princess he reveals his true identity as the resurrected Haruka Kuran, Yuki's biological father.