Kaname Kuran (玖蘭 枢, Kuran Kaname?), a Pureblood vampire and the current Head of the Kuran Clan, saved Yuuki from an attack by another vampire when she was five years old. He was the class president of the Night Class as well as the dorm leader, much feared and respected by the other Night Class students. While he is cold and authoritative towards his fellows in the Night Class, he is always kind and sweet to Yuuki. He has shown that he cares deeply for Yuuki and is in love with her, having been attached to her since she was born. He allowed Zero to live because he knew his death would sadden Yuuki as well and because Zero was useful, both to Yuki and himself. He was both jealous and angry of Zero for biting Yuuki and endangering her life. Yuki believed Kaname was her brother and at a young age they had pledged to marry each other, just like their parents, who were also siblings. Kaname revealed to Ichijo that he was actually the ancestor of Kuran and was resurrected by Rido Kuran to be his strongest slave, therefore making Rido his "master". Juri and Haruka Kuran raised Kaname as Yuuki's brother, in place of the son that Rido took and used as a sacrifice to revive Kaname. Kaname has now become the leader of Vampire Society and pursuing peace between humans and vampires.
official source: http://en.wikipedia.org/wiki/Vampire_Knight
Kaname Kuran's profile from the official VK Fanbook
Belongs to: Cross Academy, Night Class
Age: 18 years
Height: 184cm (a bit over 6 feet)
Special field: All-powerful.
Special ability: All-powerful.
Level as a vampire: pure blood type.
Family: Father (Haruka), Mother (Juuri), both dead.
Preferred food: Food made by a princess.
Type of person he likes: A serious-minded girl who waits for him in the snow to arrive.
Hobbies: reading, playing chess, thinking of his princess
How he spends his holidays: he cleans up the room; on days when he cannot meet his princess he sleeps on the sofa in a huff.
The fashion he likes: Haute Couture