Nick

Nick's wife and child have been murdered during a home invasion. As he grieves, he starts hallucinating. appears as his wife and tells him that he is a vessel, and that  wants his consent to possess him. says he is misunderstood, that he was punished for 'loving God too much". He says that, to let Nick's family be murdered, God must either be uncaring, or a sadist. He tells Nick possession will be painful, but that will help him get justice for his family. Nick assents to possession.