Underswap

Synonyms:	Underswap AU, US
See also:	Undertale, shared universe
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Underswap is an alternate universe of Undertale where most of the characters from the game have swapped their roles from canon, with their personalities usually also having being changed. This concept inspired many other AUs where different characters have been changed around, such as Storyshift, and also been combined with other popular AUs, like Underfell, to created even more different universes.