William/The Man in Black
God, where to even start with this guy (Ed Harris)? We have to go all the way back to the end of season two, when someone who appeared to be his daughter was testing him for fidelity, which would make him a Host. But is that the same Man in Black who spent much of season three in a mental institution, hallucinating people from his past? Who then gave himself a mission to “save the world” by killing all Hosts? Who then traveled to Delos’ Dubai HQ, only to get his throat slit by a Host version of himself as Charlotte Hale watched? We may get an answer in season four, but I wouldn’t count on it—especially since I’m not convinced William’s wound was fatal.
