Azazeal (pronounced "ahz-azeel") is a fictional character in the British television series Hex, played by Michael Fassbender.
In biblical Apocrypha, the fallen angels referred to in Hex as the Nephilim were in fact called the Grigori, or "Watchers."
It is most likely the difference in spelling of Azazeal/Azazel and the change to Nephilim from Grigori were done for aesthetic reasons, though this has not been officially confirmed.
In the second episode of Hex, Azazeal sacrifices Cassie Hughes' friend and roommate Thelma Bates, turning her into a ghost and releasing his power.
Through a series of demonic possessions, he conceives an heir, Malachi, with Cassie, and convinces the abortionist to put the child in his care at Christmas time.