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Reese
Frequent Answerer
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'Glitchtale' deserves a shoutout for its unique blend of crossover elements, mixing 'Undertale' with original lore and high-stakes battles. Created by Camila Cuevas, it became a YouTube sensation with its animated episodes. The AU diverges wildly from the game, introducing new villains like Hate!Chara and Bête Noire. I binged the series in one sitting—the fight scenes are jaw-dropping, especially Sans vs. Gaster. It's rare for an AU to build such a dedicated audience outside fanfic circles, but 'Glitchtale' pulled it off with cinematic flair.
2026-05-01 19:07:43
31
Ella
Active Reader
Doctor
'Underfresh' is my personal favorite—it mashes 'Undertale' with a hyper, neon-soaked aesthetic where everyone's dialed up to 11. Imagine Sans as a DJ or Undyne as a punk rocker. The sheer vibrancy of the fan art and music remixes makes it impossible to ignore. It doesn't take itself seriously, and that's the charm. I once spent hours scrolling through 'Underfresh' comics just grinning at how ridiculously fun it all was.
2026-05-01 23:34:23
7
Sophie
Sharp Observer
Data Analyst
If we're talking pure popularity, 'Dusttale' has a massive following, especially among fans who crave darker twists. It crosses 'Undertale' with a gritty, post-genocide world where Sans snaps after countless resets, becoming a vengeful force. The AU explores themes of guilt and despair in a way that hits harder than the original game. Fan animations like 'Dusttrust' amplified its reach, blending intense action with emotional weight. What grabs me is how it recontextualizes Sans' humor—now laced with bitterness. The fandom latched onto his tragic arc, spawning endless angst-filled comics and AMVs.
2026-05-02 13:12:21
14
Ian
Plot Detective
Data Analyst
I've lost count of how many times 'Storyshift' popped up in my feeds. This AU shuffles character roles while keeping their core traits intact—Chara as the fallen human, Asriel as the protagonist, and so on. The genius lies in how it reworks the plot to fit these changes, like Flowey being a corrupted version of Chara. Fan theories about the shifted timelines kept the community engaged for ages. I still debate with friends about whether 'Storyshift' Papyrus is more entertaining than the original. His flamboyant energy hits differently when he's standing in for Mettaton.
2026-05-04 13:12:46
7
Natalie
Reviewer
Translator
One of the most talked-about 'Undertale' crossover AUs has to be 'Underswap.' It flips the personalities and roles of the characters in such a creative way—imagine Papyrus with Sans' laid-back attitude or Toriel with Asgore's regal demeanor. The fandom went wild with redesigns and fanfics, exploring how these swapped dynamics would change the story. What really hooked me was how artists reimagined the sprite work to match the new personalities, giving familiar faces fresh vibes. It's like seeing your favorite characters through a funhouse mirror—distorted but weirdly captivating.
Another layer that makes 'Underswap' stand out is how it inspired offshoots like 'Swapfell,' where the swapped roles mix with the darker 'Underfell' AU. The creativity in these crossovers is endless, and it's no surprise they dominate fan art and discussions. I love stumbling across new twists on the concept, like what if Flowey and Asriel's roles were reversed? The possibilities keep the fandom buzzing.
2026-05-04 18:07:37
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Juniper, a rebellious princess, follows her deceased boyfriend into the underworld. Little did she know that she would become one of the candidates to marry the Underworld Prince.
Now, she must compete against 20 women from various worlds for the hand of a man she doesn't even want. This is a nightmare...
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I woke up as the Villainess, but instead of a halo, I got a Scythe.
However, my power has attracted the world's most dangerous monsters: A possessive Werewolf, a bloodthirsty Vampire, a Tentacle-wielding Professor, and a Biblically Accurate Angel with a thousand eyes. They think I'm their prey to be tamed, but they forgot one thing: I am Death itself.
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Elina thought she had hit rock bottom.
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Then the show ended.
The heroes won. The villain died. Everyone got their happily-ever-after.
That same night, a knock at her door shatters what little peace she has left.
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The villainess was never the villain.
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Man dies. His last act in the previous life generates him an absurd amount of karma. He meets a god, and it reborns him in a crossworld of Larry Potter and DxD. He gets a gift, one that can only be fully explored with the knowledge that he learned in his previous profession in the previous world. The keeping of knowledge is also a gift. And with that, his karma is spent.
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Yeah… Now read about some of his adventures in this crossed over world, beginning already in HP canon.
English is not my main language, so you will find some strange stuff, like the mix of North American and the Queen’s English.
Disclaimer: All characters that you recognize from the franchise of Larry Potter and DxD are propriety of its respective creators and I only wish that they were mine. But they are not. I only own the MC, the OCs, and the ideas that generated the non canon plot.
*story completed* When the Black-fur Hades meets the no-fur Doll, he can just feel his comfortable life as a back-alley fixer slipping through his paw. Being contracted to take the no-fur away from trouble brewing with his mobster owners to a breeding farm upstate seems like a straightforward enough job. But when it comes to dealing with this particular no-fur, nothing is straightforward. Bestselling authors Hermit & Star have created another steamy, dark world - this time with anthropomorphic feline Alphas and their no-fur Omegas!
Anomalies were descending on the world when I got thrown into a horror dungeon.
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An even bigger problem?
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Me: Wait… we’re doing that already?
The barrage of comments exploded:
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Searching for Sans AU crossovers can be a total rabbit hole, but a fun one. Most people jump straight to Archive of Our Own because the tagging system is a lifesaver—you can combine tags like 'Sans (Undertale)', 'Alternate Universe', and then just add the fandom you want, like 'My Hero Academia' or whatever. Filtering by kudos usually surfaces the decent stuff.
Honestly though, I find a lot of the really out-there mashups live on Tumblr. Writers will post a concept or a snippet and link to their Google Docs or dedicated side-blogs. You gotta be willing to dig through reblog chains, and the quality is... wildly variable, but sometimes you strike gold with a 'Sans in the world of 'The Magnus Archives'' thing that just clicks.
The other spot nobody talks about enough is dedicated Discord servers for specific AUs. If you're into 'Underfell' or 'Swap' crossing over with something, there's often a server where fans share WIPs and recommendations you won't find on the big archives. It feels more like a clubhouse.
I don't know if I'd call them 'top' because that feels a bit official, but the ones I keep going back to all have a shared foundation in the core AU concepts like 'Glitchtale' or 'Underfell' crossing over with something else entirely. There's this older one, a behemoth of a fic, where the 'Dusttale' version of Sans ends up in the 'My Hero Academia' universe. It's less about power-level comparisons and more a bleak character study on guilt and finding a purpose after you've... done the unthinkable in your own world. The writer nailed Sans's voice, all weary sarcasm masking a bottomless self-loathing, and watching him interact with a world built on heroic ideals created this fascinating friction.
Another crossover that doesn't get enough love is with 'The Magnus Archives'. Think about it: a universe where fear literally creates monsters, meeting a universe where monsters are born from concentrated emotion and intent? They blend almost too well. I read one where Frisk, post-pacifist, becomes an avatar for The Eye, and the way their SAVE/LOAD ability was re-contextualized as a terrifying paranormal power gave me chills. It leans hard into cosmic horror while keeping the soul of the characters intact, which is a tough balance.
AO3, no contest. The tagging and filtering system there makes it trivial to find exactly what you're looking for, and the culture skews toward longer, more developed crossover works. I'll spend an afternoon combing through 'Undertale' & 'Deltarune' crossovers with 'My Hero Academia' or 'One Piece' and come away with a dozen solid bookmarks. The kudos system is a decent indicator of what's resonated with people.
FF.net still has a massive archive, so you can't ignore it, but sorting through it feels like archaeology sometimes. The search is clunky, and you'll wade through a lot of older, abandoned fics from the peak 'Undertale' hype years to find the gems. Still, some legendary crossovers with 'Steven Universe' or 'Homestuck' (if you count that) live there, almost as historical documents.