What Are The Best Undertale Crossover Fanfiction With Other Video Games?

2026-07-24 04:23:34
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3 Answers

Quinn
Quinn
Expert Pharmacist
I've always preferred crossovers that treat the meeting as a cultural clash rather than a battle royale. 'Of Humans and Monsters' throws the Underground cast into the universe of 'Stardew Valley'. It sounds fluffy, and parts are, but it cleverly explores themes of community, trauma recovery, and building a new life through Pelican Town's daily rhythms. Sans running the Adventurer's Guild while Papyrus befriends Linus is a joy.
2026-07-25 23:38:16
4
Henry
Henry
Book Clue Finder UX Designer
The 'Glitchtale' universe, though it started as an animation series, spawned a massive amount of fanfiction that often crosses into other game lores. I've seen a bunch that weave in characters from 'Deltarune' or even 'OMORI' in really organic ways. They tend to focus on the glitchy, meta, and reality-breaking aspects of Undertale's code, using that as a bridge to other worlds.

It can be hit or miss, obviously, but when it hits, the concepts are wild. One I stumbled upon had Chara's code infecting the world of 'OneShot', with Niko having to navigate a timeline corrupted by a genocidal player. It gets deeply into the nature of player agency across different games. The prose in these can be a bit rough, but the sheer creativity in the premise carries it.
2026-07-27 17:11:45
8
Chase
Chase
Plot Detective Data Analyst
Honestly, I don't seek out crossovers that often, but 'Dust and Determination' completely won me over. It blends the worlds of 'Undertale' and 'Dark Souls' in a way that's shockingly coherent. The core idea is that Frisk ends up in Lordran, and the story treats the 'Determination' mechanic as a form of the Darksign.

It's not just about fights; it's a philosophical exploration of cycles, mercy, and persistence that feels true to both games' bleak yet hopeful tones. The writing style is stark, matching 'Dark Souls'' environmental storytelling, while the characters from the Underground react to this new, decaying world with a mix of horror and fascination.

I keep going back to a specific scene where Sans encounters Siegmeyer of Catarina—the contrast between his laid-back sarcasm and Siegmeyer's jovial despair created a dialogue I didn't know I needed. The fic is complete, which is a huge plus.
2026-07-30 16:52:28
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What are the best crossover Undertale fan games?

5 Answers2026-04-30 21:00:25
Undertale fan games have this magical way of blending universes while keeping the soul of the original intact. One standout is 'Undertale Yellow,' which expands the lore with a whole new region and characters, but still feels like it could be part of the official world. Then there's 'Deltarune: Chapter EX,' a fan-made side story that ties into Toby Fox's 'Deltarune' with such seamless creativity, it’s hard not to get lost in its charm. Another gem is 'Glitchtale,' which started as an animation series but inspired a game adaptation. It mixes 'Undertale' with original storytelling, and the combat system is surprisingly polished for a fan project. If you’re into darker twists, 'Underfell' reimagines everyone with edgier designs and dialogue, almost like an alternate timeline where kindness is harder to come by. Each of these brings something unique—whether it’s expanded lore, fresh mechanics, or just a vibe that hooks you from the first screen.

What are the top Undertale multiverse fanfiction crossovers to read?

4 Answers2026-07-17 22:53:12
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.

Where to find Undertale crossover fanfiction?

5 Answers2026-04-30 21:02:14
Ohhh, Undertale crossovers are my jam! I love how creative the fandom gets with blending its characters into other universes. My go-to spots are Archive of Our Own (AO3) and FanFiction.net—they have filters for crossover tags, so you can hunt down 'Undertale' mashed up with anything from 'My Hero Academia' to 'Harry Potter.' Tumblr’s also a goldmine if you dig deep; some writers post snippets or links there. For niche stuff, I’ve stumbled on gems in Discord servers dedicated to Undertale RP or indie game crossovers. Wattpad’s hit-or-miss, but sorting by kudos or comments helps. Pro tip: try searching 'UT/XYZ' (replace XYZ with the fandom) on Google—sometimes smaller forums or personal blogs pop up with hidden treasures. Honestly, half the fun is the hunt!

What are the best Undertale x JJK crossover fanfictions to read?

3 Answers2026-07-14 21:49:32
Never saw that crossover coming, honestly. The energy levels don't match at all, and I mean that as a good thing. Finding stories that can balance Megalovania-level chaos with the oppressive dread of the Jujutsu Kaisen world is a trip. 'Through Determination, Cursed Energy' by InkBlotz is probably the standout for me, because it commits to the weird. It throws Gojo into the Underground, but frames it like he's wandered into a pocket dimension where the rules of cursed energy are being rewritten by a kid's sheer stubbornness. The prose gets clunky sometimes, but the fight scenes? They're something else. Frisk using a cursed technique that looks like a save point, Sukuna recognizing something ancient in Sans's gaze—it shouldn't work, but it does. Most others try to shove Yuji into the Ruins and call it a day, which gets boring fast. The ones that click are the ones that treat the Underground itself as a Special Grade domain, or explore what happens when a LV system interacts with a sorcerer's innate technique. Found one last week that had Mahito trying to reshape a monster soul and having a genuine existential crisis when it didn't obey his usual logic. That's the good stuff.
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