Board Thread:General Discussion/@comment-35951900-20190202212755/@comment-35615238-20190202221322

You're so right. Gaster doesn't actually show his true form in the game but 99% of the people assume it's the Mystery Man, which isn't a wrong thing to do, honestly. Wingding is highly mysterious and not much is given to us about him, so we need to find a form that he could most likely take, and that candidate was Mystery Man.