Undertale Theories!

This is where I post all my good theories of Undertale! I am aware that I'm not the only one who has a certain theory, I'm sure that there are many out there who have done certain theories before. I post them here if I find these theories somewhere (WILL be credited) or if I make them myself. Again, I may not be the only one making these theories.

Oh and if someone out there has also made a book full of Undertale Theories, then give yourself a pat on the back.