Board Thread:General Discussion/@comment-27105236-20151003224814/@comment-15984194-20151013185045

Who knows. Perhaps his powers are limited to only possessing certain creatures. Perhaps since the supernatural creatures are tied to the anomaly of gravity falls, they have some power of immunity. I'm guessing the shape shifter probably knows about Bill, since he was familiar with Ford and Ford worked with Bill. Which would make me think that the shape shifter may dislike Bill.