Azrael

Azrael is portrayed as a Fallen Angel (or Fallen Muse, to be specific) who refused to take a side during the War in Heaven and was banished to Hell alongside Lucifer. He serves as The Man Behind the Man who encourages two other fallen angels, Bartleby and Loki, to take a course of action that will destroy the universe through a Reality-Breaking Paradox, because he's so sick of life in Hell that he thinks non-existence is preferable and he doesn't care what he has to do to achieve it.

Example of:
Archangel Azrael