Undertale Crossovers
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Book 1: The Souls of Ebbot by The Night Ninja reviews
Zane dies to the overlord but his afterlife is not exactly the Departed Realm. He winds up in the Underground and quickly makes friends with most of our main characters. Of course, everyone's favorite TV personality finds himself falling hard for the new bot in town. Drama and Romance ensues, but no bloodshed. When Frisk Falls the Underground won't look the same. Crossposted on AO3
Crossover - Ninjago & Undertale - Rated: T - English - Romance/Humor - Chapters: 17 - Words: 29,379 - Reviews: 15 - Favs: 8 - Follows: 7 - Updated: 6/24 - Published: 6/13/2021 - [Zane, Mettaton Ex] Alphys, Asgore D.
Sonic in Undertale by Archaeopteryx108
(This is a work in progress. I own nothing. Sonic is owned by SEGA, and Undertale is a product of Toby Fox.) When a blue hedgehog that can go faster than the speed of sound and a small child fall into a mountain… they will find something quite unexpected… This is a version of the Pacifist Route with Sonic in it. I will upload infrequently. Review if you enjoy!
Crossover - Sonic the Hedgehog & Undertale - Rated: K+ - English - Adventure/Friendship - Chapters: 3 - Words: 2,308 - Favs: 4 - Follows: 2 - Updated: 6/21 - Published: 6/17 - Sonic, Frisk, Chara
Firsk And The Ink Demon by Empv reviews
25 years after the pacifist route today was Firsk’s 25th birthday and Toriel was going to head to the grocery store but she never came back and Firsk was on her way to find her but what she stumble upon was a old wooden workshop that seemed abandoned for centuries...
Crossover - Undertale & Bendy and the Ink Machine - Rated: T - English - Romance/Drama - Chapters: 30 - Words: 7,202 - Reviews: 7 - Favs: 23 - Follows: 20 - Updated: 6/17 - Published: 5/28/2018 - Bendy, Frisk
The Memoir of Frisk by dafid1 reviews
What if Frisk went to the world of Fairy Tail?
Crossover - Fairy Tail & Undertale - Rated: K+ - English - Adventure/Friendship - Chapters: 4 - Words: 4,920 - Reviews: 4 - Favs: 10 - Follows: 14 - Updated: 6/16 - Published: 6/5
Edd-Tale by ZPI
When Eddy's scam fails again, the Eds and another kid must work together to escape (or save) the underground. Will they survive? Will they make friends? Read and find out. Ed, Edd, n Eddy by Danny Antonucci. Undertale by Toby Fox
Crossover - Ed, Edd n Eddy & Undertale - Rated: T - English - Adventure/Friendship - Chapters: 1 - Words: 1,893 - Published: 6/12 - Eds, Frisk, Chara
Hazbintale by TheShade18 reviews
Who knew dying could offer new possibilities to monsters? Or more like a second chance like humans have? Now, it sounds cool if only it wasn't for the fact that I have been transported to Hell... as a Human itself. And why is this other smiler so interested in me? Oh well, at least it's a beautiful day outside.
Crossover - Undertale & Hazbin Hotel - Rated: M - English - Adventure - Chapters: 2 - Words: 6,595 - Reviews: 24 - Favs: 52 - Follows: 59 - Updated: 6/8 - Published: 5/7 - Sans, Alastor, Charlie, Blitzo
Welcome to the Underground, you have never been here before by RealEdgeQuarter
Omori had been repeating the same adventure for two whole years now. Some people might think Omori would hate how repetitive it all was, but they would be wrong. Omori loved the repetitive nature of his life since it made his job so much easier. So that’s why Omori was annoyed by the fact he fell down a mountain filled with monsters instead of going on his usual adventure
Crossover - OMORI & Undertale - Rated: T - English - Adventure - Chapters: 1 - Words: 1,900 - Favs: 2 - Follows: 3 - Published: 6/7 - Chara, Flowey
When There's A Whip, There's A Way - (Outdated) by GreaterAxelord reviews
Richter's past few years were a living hell for him. So, when he got the chance to redeem himself by killing Shaft and Dracula for the second time, he gladly took it. Too bad a Belmont's life is an unlucky one. In the end, he found himself in a completely different world of monsters; one where they weren't constantly attacking him. Good for a dying man like himself, he guessed.
Crossover - Castlevania & Undertale - Rated: T - English - Chapters: 13 - Words: 75,576 - Reviews: 12 - Favs: 26 - Follows: 18 - Updated: 6/4 - Published: 10/7/2016 - Richter B., Frisk, Asriel, Toriel - Complete
Nightmare Chores (Nightmare Fredbear x Child reader by GlitterdragonTGPOU YT reviews
you were adopted by Nightmare Fredbear and his family. you were given chores that you have difficulty completing.
Crossover - Five Nights at Freddy´s & Undertale - Rated: K+ - English - Fantasy/Family - Chapters: 1 - Words: 1,286 - Reviews: 1 - Published: 6/3 - Nightmare, Fredbear - Complete
Worlds above the Underground (Rewrite) by bopdog111 reviews
(Rewrite of Ulrich's idea) Frisk Dreemurr did the impossible and freed the monsters from their prison under Mt. Ebott. She saved all of monster kind and even went the extra mile to try and bring back Chara and Asriel and succeeded. Now on the Surface the three Dreemurr children have a new goal, becoming three great Entertainment Duelists. Co-Write with Ulrich362
Crossover - Yu-Gi-Oh! Arc-V & Undertale - Rated: T - English - Suspense/Adventure - Chapters: 16 - Words: 99,364 - Reviews: 2 - Favs: 17 - Follows: 16 - Updated: 6/3 - Published: 2/8/2021 - [Yuya S., Frisk] [Yuzu H., Asriel]
Overlord x undertale by FusingHorse9806 reviews
Año 2138,Hoy , el juego en linea que tanto alboroto ocasiono ,Yggdrasil,Pondrá silenciosamente fin a su servicio...Bueno se suponía que eso pasaría... Sin embargo el juego no se desconectó después de la hora final.Y un jugador asalariado fue arrastrado a ...¿Una cama de flores dorada en medio de las profundidades de una cueva? ¿Que ara el mago mas fuerte de todos en el subsuelo?
Crossover - Overlord/オーバーロード & Undertale - Rated: T - Spanish - Chapters: 1 - Words: 7,431 - Reviews: 5 - Favs: 9 - Follows: 10 - Published: 6/2 - Ainz, Sans, Toriel, Flowey
GodVirus by DarkTaleSans
Its an undertale au.
Crossover - Undertale & JoJo's Bizarre Adventure - Rated: T - English - Fantasy/Adventure - Chapters: 1 - Words: 136 - Published: 6/2
A Dimensional Scatter by SkyBenny10 reviews
Sonic and his friends are teleported into an unknown area, separated from each other. There, they meet an unknown tribe of people called "Monsters" who are trapped in this place. When the Monsters find what they are looking for, however, the morales between them and the Sonic gang clash for what's right and wrong. (Rated T for some instances of swearing.)
Crossover - Sonic the Hedgehog & Undertale - Rated: T - English - Adventure/Drama - Chapters: 3 - Words: 6,099 - Reviews: 13 - Favs: 17 - Follows: 23 - Updated: 5/31 - Published: 2/7/2020
SOULS of Barian! by bopdog111 reviews
Sequel of "The Hope Reborn". Years after Illaster's defeat the Princeton Family seem to do unfinished business with the Anomaly, and Agate who escaped, and are facing a new threat from the Barians, and the Number cards with allies from Astral World, and Yuma Tsukumo. Co-Written with Ulrich362. SharkxOC, RioxOC, YumaxCathy
Crossover - Yu-Gi-Oh! ZEXAL & Undertale - Rated: T - English - Romance/Adventure - Chapters: 20 - Words: 139,298 - Reviews: 4 - Favs: 18 - Follows: 13 - Updated: 5/30 - Published: 9/11/2020 - Ryoga K./Shark, Rio K., OC, Frisk
Edwin-tale by Bakaforhire reviews
With no memory of how he got there, Frisk has to work together with another kid to survive(and maybe save) the underground. But how can they do that if they can't reset and the other kid is less smarter (and way stronger) than them? (Prequel to Doki Eddy Literature Club)
Crossover - Ed, Edd n Eddy & Undertale - Rated: T - English - Adventure - Chapters: 12 - Words: 50,276 - Reviews: 7 - Favs: 11 - Follows: 2 - Updated: 5/27 - Published: 1/7/2019
Principal Willoughby in Undertale 2 by callofdutyFTWnintendoFTL
Principal Willoughby has a grand adventure in the new game on the Intellivision Amico, Undertale 2, and fights a lot of evil villains in the universe of this game.
Crossover - Jimmy Neutron & Undertale - Rated: M - English - Adventure/Horror - Chapters: 1 - Words: 2,494 - Published: 5/22 - Principal Willoughby, Asriel - Complete
LOUDERTALE but my version… Genocide… by Loudcrowd111 reviews
A while ago to prove the legend was trueLincoln had accidentally fell into a mountain called Mount Ebott and met the monsters and made some friendsAfter completing the True Pacifist Undertale route, Lincoln had gotten curious, what if instead of Sparing everyone… he killed everyone? And this time… things will be slightly different than normal Undertale..,
Crossover - Loud House & Undertale - Rated: T - English - Tragedy/Drama - Chapters: 9 - Words: 46,702 - Reviews: 14 - Favs: 5 - Follows: 6 - Updated: 5/22 - Published: 3/16 - Lincoln L., Sans - Complete
Frisk's secret by Blacmage reviews
WBWL, Frisk is fem harry, summary inside. Frisk is still gender neutral oc's
Crossover - Harry Potter & Undertale - Rated: K+ - English - Mystery/Hurt/Comfort - Chapters: 4 - Words: 2,680 - Reviews: 22 - Favs: 84 - Follows: 86 - Updated: 5/22 - Published: 3/25/2020 - Complete
La Historia Del Protector Multidimensional Y La Princesa Carmeci by Renjicorrupt09
Hola a todos soy epic-sans y soy un escritor el cual renji:Hey sans ya terminaste la- en eso estoy tomate! ejem bueno solo dire que Disfruten el contenido
Crossover - High School DxD/ハイスクールD×D & Undertale - Rated: M - Spanish - Adventure/Supernatural - Chapters: 2 - Words: 2,591 - Published: 5/21 - [OC, H. Akeno, Rias G., Chara]
His Timeline by Alenshi
Kai Smith. In the Underground. Surrounded by monsters unlike anything he's ever seen before. All sorts of shenanigans ensue. This should be pretty self-explanatory, let's be real here.
Crossover - Ninjago & Undertale - Rated: M - English - Adventure/Drama - Chapters: 3 - Words: 4,460 - Favs: 1 - Follows: 1 - Published: 5/21 - Kai, Sans, Toriel, Flowey
Beastar Tales by Snivy the Hero reviews
4 years since Asriel was reborn and now he is a 16 year old, who is now being transferred to Cherryton Academy! Due to Asgore could do nothing about certain school systems, Asriel chose this way to finally to get a high school education. Something sinister goes down in the school and he is involved whether he likes it or not. Can he and his friends solve this crime in time?
Crossover - Undertale & Beastars/ビースターズ - Rated: M - English - Mystery/Adventure - Chapters: 4 - Words: 8,168 - Reviews: 1 - Favs: 6 - Follows: 8 - Updated: 5/21 - Published: 12/2/2021 - Asriel, Legosi, Haru, Juno
Frisk Potter (rewritten ver of frisk's sercets) by Blacmage reviews
summary inside fem!harry
Crossover - Harry Potter & Undertale - Rated: K - English - Family/Hurt/Comfort - Chapters: 1 - Words: 1,351 - Reviews: 3 - Favs: 29 - Follows: 36 - Published: 5/18
Arc-Tale by King-Mac-11 reviews
Jaune Arc climbed a mountain outside his home village. He fell into the famed mountain. Now he needs to find a way out. But things are rarely easy, so he has to take on an odd gauntlet within Mount Ebott. Monsters aren't always Grimm, and not always bad either. All he can do now... is remained Determined.
Crossover - RWBY & Undertale - Rated: T - English - Adventure/Fantasy - Chapters: 3 - Words: 11,975 - Reviews: 36 - Favs: 116 - Follows: 134 - Updated: 5/16 - Published: 3/18 - Jaune A., Undyne, Toriel, Asgore D.
Underleague by sen whitefox mako red demon reviews
Here we are we made it. The Underleague, the most difficult challenge for any pokemon champion out there. 8 Gyms, 4 Elite members, 1 ultimate pokemon master. Their latest opponent? A...ten year old kid, without a license and and little eevee...Um is-is this normal? Oh, so your Frisk and you literally fell down here? Well in order to get out you have to go through the league. Sorry
Crossover - Undertale & Pokémon - Rated: T - English - Adventure/Family - Chapters: 44 - Words: 90,132 - Reviews: 51 - Favs: 106 - Follows: 115 - Updated: 5/15 - Published: 9/11/2016 - Frisk, Asriel, Papyrus, Sans
Oh Boy, what I have gotten myself into now? by BlackMoon3464 reviews
Harry James potter the master of death has seen many things. Through his many years of being alive, while trying to run away from death himself his responsibilities as master of death, but walking up as a skeleton and being in a house surrounded by other skeletons and while the only human in the house keeps harassing him.
Crossover - Harry Potter & Undertale - Rated: M - English - Fantasy/Romance - Chapters: 4 - Words: 9,215 - Reviews: 17 - Favs: 92 - Follows: 95 - Updated: 5/10 - Published: 5/4/2021 - Harry P., Papyrus, Sans
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