Doctor Jezebel Disraeli

Cain's brother by adoption. Jizabel is a sadistic doctor and works for Cain's father in the secret society Delilah. He loves to collect human organs and always keeps the organs of his deceased mother and sisters at hand. It is revealed later that Jizabel is actually Cain's half brother: his mother was Alexis' mistress. As a child, Jizabel was a vegetarian who genuinely cared for life, but was forced to eat his pet sheep by Alexis. He craves for his father's love and thus hates Cain because Alexis spends all of his attention on Cain. He is unofficially "Death" in Delilah's Major Arcana until later in the series (he had no desire to undergo the bothersome regeneration necessary to join Major Arcana officially). Although his schemes to destroy Cain seem ingrained to his life, he helps Riff with a drug to keep him 'alive'; although he does threaten that he will die if he doesn't betray Cain, because if he doesn't, he won't give him the drug. Later Riff 'dies' (read Riff), and then comes to tell Cain Jizabel's true intentions. Jizabel was actually trying to slow down the process of his 'death'. Reasons to this is yet unknown, and not 100% accurate of whether he was trying to help Riff and Cain, or gather more information. However, in the final Godchild manga, he dies while giving the last of his 'life blood' to Riff. The mangaka, Kaori Yuki, claims that Jizabel is her favorite character.

- From the Count Cain Wikipedia