Copyright: underswap

Underswap (having many variations depending on the artist such as Fazzy!Swap, Canon!Swap, TS!Underswap and such.) is a role-swapping Alternate Universe created by the Tumblr user "popc0rnprince" for the indie RPG UnderTale.
The premise of the AU is that characters swap roles, personalities and designs. Sans is now a member of the Royal Guard, and attempts to capture the human; taking the role that Papyrus did in the original UnderTale. Contrarily, Papyrus takes the role that Sans originally did; being the judge to the human's actions, and battling them in the genocide route, whilst being generally relaxed and bone-headed (badum-tshh) like Sans originally was. There are a multitude of other character swaps in the original Underswap, but the original list of swaps has long since been forgotten, and this wiki page wouldn't need to detail them as they are unimportant to the main article.

This tag implicates alternate_universe (learn more).