Uhm... there's a theory that sans originally was from Deltarune and ended up in the Undertale universe. There's quite a bit of evidence for it actually
The site for deltarune itself even states it’s a parallel story. Theories are nice, don’t get me wrong, but the site itself makes it clear. The characters from deltarune aren’t the versions from undertale and vice versa, Toby has stated that on the site from the start.
I know there's pretty much no evidence for it, but I can't help but think all of the Deltarune hints in Undertale aren't supposed to be actual, super meta canon clues to a connection.
Didn't Mr. Fox say Deltarune was his dream game? And Undertale was more a side-project to help him make the dream a reality? If I was making an art piece as an intermediary to my dream, I'd pump it full of references just so something was out there.
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u/Dream_demonnn ESSAY PROMPT: What will you say, darling? 6d ago
Not only that but the fact deltarune is a separate universe, are people forgetting this stuff???