Board Thread:General Discussion/@comment-27836448-20160220210617

I am almost certain that Gaster's first possible sprite is the correct one. With the update, many gaster-related things were made possible to encounter, including the mystery man room being able to be seen aswell. I doubt Toby's just adding the mystery man for giggles, it's most likely gaster. But, there's still the possibility he's just another follower or something.  