The Most Popular Undertale AU, Ranked

Choose the Undertale AU you think is the most popular!

Author: Gregor Krambs
Updated on May 24, 2024 07:11
Fan creations like alternate universe (AU) stories often generate substantial enthusiasm and discussion among communities, particularly in expansive fandoms such as that of Undertale. With numerous AUs emerging, each offering a unique twist on the original narrative and characters, it becomes a challenge for newcomers and veteran fans alike to keep track of or find the AUs that resonate most with the community. By casting votes for their favorite Undertale AUs, users directly contribute to the creation of a dynamic ranked list that reflects current preferences. This process not only aids in identifying which AUs captivate the community's interest the most but also gives newcomers a structured starting point to delve into fan-created stories. Voting also encourages ongoing engagement within the community, fostering a space where opinions and favorites can have a visible impact on the rankings.

What Is the Most Popular Undertale AU?

  1. 1


    An AU where the story takes place in space.
    • Unique Setting: Space.
  2. 2


    Centers around Ink Sans, who creates and protects AUs.
    • Main Character: Ink Sans.
  3. 3


    An AU where characters swap roles and personalities.
    • Key Character Swap: Sans and Papyrus swap roles with Toriel and Asgore.
  4. 4


    A horror-themed AU, set several years after a neutral ending.
    • Setting: Post-neutral ending, with a horror twist.
  5. 5


    An AU exploring the consequences of abusing SAVE and RESET.
    • Theme: Consequences of SAVE and RESET abuse.
  6. 6


    An AU focusing on Sans trying to stop the player after multiple genocide routes.
    • Premise: Sans becomes the antagonist after multiple genocide playthroughs.
  7. 7


    Combines elements of UnderSwap and UnderFell, featuring role swaps and a darker theme.
    • Combination: Merges UnderSwap's role swaps with UnderFell's darker tone.
  8. 8


    Set after a genocide run, focusing on Sans dealing with the aftermath.
    • Setting: Post-genocide run.
  9. 9


    A darker version of the Undertale universe, where characters are more aggressive.
    • Theme: Darker and edgier.
  10. 10


    Focuses on the characters Dream and Nightmare Sans, representing positive and negative emotions.
    • Concept: Dream and Nightmare Sans embody positive and negative feelings.

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About this ranking

This is a community-based ranking of the most popular Undertale AU. We do our best to provide fair voting, but it is not intended to be exhaustive. So if you notice something or Undertale AU is missing, feel free to help improve the ranking!


  • 51 votes
  • 10 ranked items

Voting Rules

A participant may cast an up or down vote for each Undertale AU once every 24 hours. The rank of each Undertale AU is then calculated from the weighted sum of all up and down votes.


Additional Information

More about the Most Popular Undertale AU

Undertale, a game by Toby Fox, has inspired many alternate universes, or AUs. These AUs reimagine the original story, characters, and settings. Fans create them to explore new ideas and possibilities within the game's world. The concept of AUs adds depth and variety to the Undertale fandom.

An AU can change many aspects of the original game. It might alter the characters' roles, personalities, or even the entire plot. Some AUs explore what would happen if a key event had a different outcome. Others place characters in new settings or time periods. This creative freedom allows fans to see their favorite characters in new and exciting ways.

The Undertale community embraces the idea of AUs. Artists, writers, and musicians contribute to these alternate stories. They create fan art, comics, stories, and even games based on their AUs. This collaboration helps the community grow and stay active. It also brings fresh content to fans who love the original game.

The popularity of AUs can be attributed to several factors. First, Undertale's characters are well-developed and relatable. Fans feel a strong connection to them and enjoy seeing them in different scenarios. Second, the game's story is rich and full of potential. It invites exploration and reinterpretation. Lastly, the game's creator, Toby Fox, encourages fan creativity. This support has fostered a welcoming environment for new ideas.

AUs often have their own unique twists. Some AUs focus on darker themes, exploring the consequences of certain actions. Others take a lighter approach, adding humor and whimsy. This variety ensures there is something for everyone in the Undertale fandom.

Community events and collaborations also play a role in the popularity of AUs. Fans come together to work on large projects, such as animations or game mods. These projects showcase the talent and dedication within the community. They also provide opportunities for fans to connect and share their love for Undertale.

Social media and online platforms help spread AUs. Sites like Tumblr, Twitter, and DeviantArt host countless fan creations. These platforms allow fans to share their work and discover new AUs. They also enable creators to receive feedback and support from the community.

Merchandise and fan-made products further boost the popularity of AUs. Fans create and sell items like prints, stickers, and clothing featuring their favorite AUs. This allows them to support creators and show their appreciation for the content they love.

The impact of AUs on the Undertale fandom is significant. They keep the community engaged and excited about the game. They also inspire new fans to join and contribute. As a result, Undertale remains a vibrant and dynamic fandom, years after its release.

In conclusion, Undertale AUs are a testament to the creativity and passion of the game's fans. They offer new perspectives on beloved characters and stories. They also foster a sense of community and collaboration. Through AUs, the spirit of Undertale continues to thrive.

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