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Undertale Alternate Universe (AUs) are what-if changes to the universe of Undertale . AU categories are used to differentiate AUs and to avoid confusion between AUs (categories are not AUs themselves). An AU can fit under multiple categories.
Every Single Undertale AU That Ever Existed! Welp. Here it is. Took me about 6 months to find all these AU's and I'm pretty sure this is all of them. If there are any I missed just let me know and I'll add them to the following list: AU Count: 2025. 123 Slaughter Me Tale.
This is a wiki dedicated to the myriad of Alternate Universes for the indie role-playing game UNDERTALE, by Toby Fox. Alternate Universes, or "AUs", are alterations to the story, world, and or characters of Undertale, be it crossovers, changes in aesthetic, or role-swaps.
Every single character in Undertale is changed. AUs that only affect some of the characters are not found here, nor are AUs that change only during the time Frisk is within the underground.
