Rido Kuran

 is a pureblood and the main villain of the story. He is Yuki's uncle and the birth father of shiki senri. Hiou Shizuka was originally his betrothed fiancée but has a illegitimate child with a noble vampire. As Rido is the biggest threat to Yuuki's live hood, Kaname sees him as the enemy he has to eradicate at all costs. Rido was the person who sacrificed the life of Yuuki's biological brother Kaname to reawaken the powerful ancestor Kaname from his thousand years of slumber. Technically making himself Kaname's master, Rido thought he could enslave the ancestor Kaname into listening to his every order. However, his plans backfires and was instead slashed into pieces by young ancestor Kaname. Taking him 10 years to regenerate his body. He comes back attempting to kill her once more.