Sans and Papyrus are parts of Gaster, from when he fell into the core and got split across time and space. They resemble two halves of Gasters Personality.
Yes, I know some people believe that this is canon to the original game, just... sigh. Deal with it okay? Thankyou.
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Undertale AUs (in my opinion)
RandomHi! This is a random idea I came up with, and in it, I'll be listing every undertale au I know of, and (at least) every main character within them. In my point of view, of course. If anyone wants to share their views on any of them then fine by me...
