I thought I would explain this before I go any further since there is a bit of confusion about the characters.
Kaname is a vampire as stated earlier but he also is considered rare like his two cousins that were briefly mentioned Megumi and Yamato are all vampires that contain blood from a dragon. He is a masochist like majority of Dragon Vampires. He enjoys pain he does not survive off of blood either. Another thing about Kaname's background somewhere down in his family line someone married a human so their family lost majority of the power that was gained from the dragon's blood that runs through his body. His own parents and uncle only had one-eighth dragon's blood where both of his cousins were direct descendants of the original vampires that drank the blood from the dragon. Kaname is a bit of an introvert but an extravert when he chooses to be. Besides the interest in being injured he loves composing music which keeps his mind off of being injured.
Sayuri or Yuri she is from a royal family who only returned living in the human world because it was safe for them to do so. Yuri is the heir to the throne back home at their small castle in the demon rule. She was given a rare chance by the current head of the family her grandmother (who is a pureblood vampire and the matriarch of the family) Minami. Their family was always ran by a woman but she barely survived the destruction of her father's side of the family when she was a child. Her mother Mei and Shun were the only survivors from that battle. Her mother barely survived. Her brother awoke as a vampire during the battle. Shun's role in Yuri's life is not only protector but advisor. Yuri grew up with a distant relative who decided that he wanted to end his life before she enrolled at Saotome Academy. Shun suggested that Yuri spend a year there along with Megumi's approval. Yuri's family are a lower royal family so they need approval from a higher royal family like Megumi and Yamato's before they can allow their next head of household do anything.
