Uploaded September 2023 | Updated September 2026, 3 weeks ago

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Links:
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Undertale/Megalovania by - Toby Fox
Underswap AU was created by - p0pcornpr1nce (web.archive.org/web/20160522224951/http://underswapped.tumblr.com/about)

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Undertale is a 2015 2D role-playing video game created by American indie developer Toby Fox. The player controls a child who has fallen into the Underground: a large, secluded region under the surface of the Earth, separated by a magical barrier. The player meets various monsters during the journey back to the surface, although some monsters might engage the player in a fight. The combat system involves the player navigating through mini-bullet hell attacks by the opponent. They can opt to pacify or subdue monsters in order to spare them instead of killing them. These choices affect the game, with the dialogue, characters, and story changing based on outcomes.

Underswap is an AU where many of the characters' roles are swapped, as well as their personalities, though some quirks tend to stick in places, or are modified. Sans is the excitable, confident, extremely optimistic human hunter, while Papyrus is the laid back, protective bro following Chara (who is swapped with Frisk).
The plot of Underswap revolves around each character from the Undertale universe being swapped with other characters, such as Sans' and Papyrus’ personalities being swapped (although they keep the same names, so what we consider Sans to be as a character is now how Papyrus is, for example).