Another unexpected fan favourite to emerge from the Thor franchise was Loki, Thors adopted brother and the main antagonist in Thor and The Avengers, as well a supporting villain in Thor: The Dark World. He was a huge presence in Phase 1 of the Marvel Cinematic Universe, and shouldnt be counted out just yet, considering that he is still alive and well in Asgard disguised as Odin. One of his greatest scenes in Thor contains a mistake, however, and a bit of a glaring one at that. As he goes to lock the Bitfrost on Jotunheim at the end of the movie, he is carrying Odins staff and wearing his helmet. Only, when he uses Heimdalls sword to open the Bitfrost, his helmet has vanished. He goes on to freeze the electrical streams, and then when Thor shows up to stop him, the helmet has reappeared. I know hes pretty powerful, but that seems like such an odd time to be messing around with vanishing your helmet just because you can.