Crowley’s reference is the Fallen from the Good Omens fictional universe Good Omens is a fantasy comedy series created and written by Neil Gaiman, based on his and Terry Pratchett's 1990 novel of the same name. Like the novel, Good Omens features various Christian themes and figures and follows various characters all trying to either encourage or prevent the coming of an imminent Armageddon seen through the eyes of the angel Aziraphale and the demon Crowley. Crowley is one of the main characters in the series Good Omens. He is a demon who did not so much fall from Heaven as Saunter Vaguely Downwards. Being the snake that tempted Eve in the Garden of Eden, naturally, his human form also has snake eyes, which he usually covers with designer sunglasses. He is Aziraphale's best friend and life partner. Demons, also known as the Fallen, serve as the major characters and antagonists in Good Omens. The demons were once angels, who agreed to follow Lucifer in rebelling against God in the beginning. The rebellion failed, and every traitorous angel was banished to Hell. Lucifer became Satan and all the angels became demons, who would try to tempt God's new creations, humans, to commit sin and be damned to Hell.