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Undertale 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.

AU Types

The basic types of AUs.

Switch Up

Some or all of the canon Undertale characters swap roles and/or personalities with the other canon Undertale characters. e.g: Sans replaces Toriel. No new characters are added, and the story is relatively the same for the most part.

If only one character pairing is swapped, it doesn't fit in this type. In that case, the AU is most likely in the Character-centered type.

Crossovers

A mixture of a story, game, movie, TV show, or book, or personal characters and Undertale; A two unrelated universes/shows/etc combined into one AU.

Basic Change

Every single character in Undertale is changed while still remaining in the same basic story in some which way or form. AUs that only affect some of the characters are not found here. AUs that change only during the time Frisk is in the underground are not found in this category.

Some AU categories are part of this type:

AU where everyone is the same person

As simple as it sounds, these are the AUs in which every character is the same person as every other character. Of cause this brings up questions like, is the Undyne in the Captain of the Guard role in Undynetale the same as canon Undyne or are they the Undynest Undyne in the multiverse (or an amalgamation of every other character, as she is "everyone"). We may never know.

These are comedic in nature and rarely make much sense beyond amusement value.

Species Swap

The species of all the characters have changed. Being changed into objects also works here.

Concept Change

AUs that change the basis of the story, such as sequels and backstories.

Character-centered

AUs that are focused on a particular set of characters. These include headcanons, extensions, and flat out new ideas.

Self-insert

AUs in which 1 or more characters are replaced with real people.

AU Tones

The tone of AUs.

Serious

AUs that, as opposed to Comedic AUs, actually hold a serious story and such.

Comedic

AUs that are mostly comedic in nature. Bare in mind that a Parody can be bother dark or comedic so they aren't necessarily the same thing.

Fell

A category for the 'Fell' version of other AUs (e.g. Swapfell if a fell iteration of Underswap.)

Horror

Warning: Some of these AUs contain themes that may be disturbing to some viewers.

AUs with the goal of creating something scary, insane, or disturbing. Some AUs that follow the genocide route are also found here, but not all are geno-route-only. Some possible themes include suicide, drug use, alcohol use, depression, death, gore, insanity, disfigurement, pain, etc. Horror can also include Terror, and effects on psychology. This could include things like dystopias and the like.

It is suggested you read the short bios of these before googling them!

AU Continuities

The time where the AU's plot happens.

Backstory

AUs that cover the backstories of characters and lore or change the backstories, leaving most other things the same.

Special Event

AUs that change the plot in the middle of the reset-able timeline (After the main story begins and before the endings).

The change affects most or all characters, otherwise it belongs in Character-centered.

Sequel

AUs in this category should be moved to the proper subcategories.

AUs that are sequels to the original Undertale or other AUs.

They are set after a route (Leaving the Underground/Destroying the world). Otherwise, it belongs in Special Event.

Post-Pacifist

AUs that happen after the Pacifist Route.

Post-Neutral

AUs that happen after the Neutral Route.

Post-Genocide

AUs that happen after the Genocide Route.

Post-/Soulless Pacifist AUs go here.

Medium

The way the AU's story is told.

Animation

Stories told through animation series.

Comic

Stories told through comics or graphic novels.

Games

A type of AU that has/will have a playable game/mod.

Written story

AUs written as text based series.

Miscellaneous AU Categories

Categories that don't fit in the above categories.

Community Shared

AUs made by large parts of the community as a whole, instead of by just one person. Everyone has a common idea. Which is why they are called 'Community AUs, Floweypot is a good example. There are no real creators until they are confirmed by the community.

AUs of AUs

AUs that are modifications to pre-existing AUs.

Parodies

AUs that are made to be a parody of Undertale, other AUs and/or another piece of media.

Joke AUs

AUs that were only created as a joke, with no intentions of becoming a serious AU.

Outside the Underground

The story does not take place within the Underground, but do take place within a Universe.

Add

AUs in which OCs are added.

Subcategories

This category has the following 28 subcategories, out of 28 total.

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Pages in category "AUs"

The following 200 pages are in this category, out of 550 total.

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Media in category "AUs"

The following 3 files are in this category, out of 3 total.

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