Rido Kuran

A pureblood vampire, Senri Shiki's father, Haruka Kuran's elder brother, and Yuki's uncle. He is supposed to be dead and his true body appears that way. However, he is still able to transfer his soul to other bodies and take control. His eyes are two different colors (crimson and blue), and when his soul is transferred to a different body, that body has eyes of two different colors. Rido's soul was in control of his son's body but later he recovers his real body.
According to Asato Ichijo, he is the true head of the Kuran family. He secretly revived and regained power aided by the Ancient Vampire Council and the Hunters' Association. Ten years ago, he was nearly killed by Kaname when Rido attempted to take Yuki's blood for unclear reasons related to his full restoration. However, Kaname couldn't strike the final blow (reason below). Rido is also aware that his fiancée, Shizuka Hiou, was killed by Kaname.
Rido is the one who revived Kaname, who is the Original Vampire. That is also why Kaname cannot kill him.
In the recent chapters 38 and 39, Kaname gives the Kuran blood to Rido in order to restore Rido to his original body.
In chapter 40, it is revealed that Rido is the one who changed the list. The list of Level E vampires to be liquidated by the Hunter's Association. It is because of him that the name of the manservant (who had never fallen to Level E) whom Shizuka loved was voted onto the list. Unfortunately, the Kiryu's got the servant who became a target.
In chapter 42, he finally meets Yuuki. At first Rido wanted to eat her to gain a new power, he refers to her as "The currently the youngest, most fresh and delicious morsel brimming with power on this world... the pure blood princess of the Kuran". But since Yuki reminds him of Juri he seems to have left the idea of eating her and instead becoming his lover as a replacement of Juri. It was revealed that he had loved Juri before.