Rupert Galvin is an American Demon hunter with a sarcastic sense of humour. He is Luke's godfather and was a close friend of Luke's late father whose death it has been implied he was partly responsible for. Rupert appears ruthless and sometimes cold-blooded as he is driven by a fanatical hatred of demons because one of them murdered his wife but he is a warm-hearted individual who cares about his friends and looks on Luke as a son. He also has a tendency to drink too much to drown his sorrows.