Ryu Kutou

President of the student council. Like Rinne, he's human and can bleed. He has gathered a few of the other humans alongside himself in the student council.

[Spoiler] He is Abel, the first murdered person in the world. When he appeared in Hell, he made a pact with Seven Sins to defeat Cain when he gets to Hell as well. However he was defeated by Cain and Abel's hatred was sealed. Abel had brought Rinne to the Hell world. Since she is the reincarnation of his mother Eve she is able to break the seal that confines Abel's hatred. [/Spoiler]