Undertale Crossovers
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Undernatural by Higher on Fire reviews
When Sam and Dean fall into Mt. Ebbott on the search for a lost child, they encounter several new beings. A demonic flower, a friendly goat lady, and even some weird skeletons. Sam and Dean have plenty of fun trying to find their little friend, but when they learn the true secrets of the Underground, they realize their search is more desperate than they though.
Crossover - Supernatural & Undertale - Rated: T - English - Fantasy/Adventure - Chapters: 4 - Words: 2,081 - Reviews: 15 - Favs: 36 - Follows: 42 - Updated: 9/10 - Published: 7/28/2016 - Complete
Endless Palace by WingedSword reviews
It was another meaningless day, in her meaningless life. In a mansion of Pure White, Oh Snowflake untainted by the outside world, a world she cannot ever reach. So she dreams of a life where freedom is at her reach, freedom she isn't the only one to seek... Cover Art by me. One shot story.
Crossover - RWBY & Undertale - Rated: T - English - Mystery/Supernatural - Chapters: 1 - Words: 2,564 - Reviews: 2 - Favs: 4 - Follows: 3 - Published: 9/8 - Weiss S., Jacques S., Gaster - Complete
Eğlence Çetesi, 1 Kısım - Yeni Bir Macera by Ateo.J142536
Eğlence çetesini tanıyorsunuz, ama hiç nasıl bu grubun oluştuğunu size anlatamamıştık! Şimdi gelin ve bu destansı maceranın nasıl başladığını öğrenin! Not: Bu hikaye aynı zamanda diğer oyunlardan ve medyadan da esinlenmiştir (Bazı kendi orijinal fikirlerim ile karıştırılmıştır!)
Crossover - Undertale & Deltarune - Rated: T - Turkish - Adventure/Humor - Chapters: 4 - Words: 4,694 - Updated: 9/4 - Published: 8/30 - Chara, Lancer, Ralsei, OC
The Mountain of two Legends! by bopdog111 reviews
Frisk succeeded in freeing the Underground from the Barrier, and all is freed back to Tamriel... too much they see is wrecked with strife from the Thalmor, and now a Dragon Menace. Teamed up with Jin, a former Soldier of the Imperial Empire, and the fated Dragonborn, they all travel to stop the Dragon Meance, and the Thalmor in a unlikely alliance. (Pairings Undecided)
Crossover - Elder Scroll series & Undertale - Rated: T - English - Family/Adventure - Chapters: 16 - Words: 101,196 - Reviews: 3 - Favs: 22 - Follows: 22 - Updated: 9/2 - Published: 6/30/2022 - Dragonborn/Dovahkiin, Delphine, Frisk, Chara
Fun Gang, Part 1 - A New Adventure by Ateo.J142536
In this first part of our story, 3 different people will have to meet in another world and save it from a cruel tyrant. But to succeed in their goal, they will have to put their differences aside and work as a team! Come to this fantasy adventure in another world and learn the story of our heroes! Note: The images in this story are not mine and its also inspired by other stories.
Crossover - Undertale & Deltarune - Rated: T - English - Adventure/Humor - Chapters: 2 - Words: 2,739 - Published: 9/2 - Chara, Lancer, Ralsei, OC
Under the Veil by poplasia reviews
Sans has gotten himself stuck in the void between worlds in a successful attempt to stop the resets of his timeline. He's not sure how long he's been chillin' alone there, but eventually a chance at escape stumbles his way in from the Veil of Death. His name?—Sirius Black. (no pairings)
Crossover - Harry Potter & Undertale - Rated: T - English - Fantasy/Humor - Chapters: 73 - Words: 263,453 - Reviews: 2280 - Favs: 2,498 - Follows: 2,836 - Updated: 9/1 - Published: 8/1/2016 - Sirius B., Sans
Pacifism, Genocide, and Caboose by CookedCorv reviews
Michael J. Caboose has seen a lot of weird things, but talking flowers that try to kill him isn't one of those things. But, regardless of who tries to kill whom and who blows up who on accident, Caboose will do his best to befriend every cool monster he comes across! Violence and Language included that is not suitable for f**king losers.
Crossover - Red vs. Blue & Undertale - Rated: T - English - Humor/Friendship - Chapters: 2 - Words: 2,340 - Reviews: 10 - Favs: 14 - Follows: 17 - Updated: 9/1 - Published: 12/6/2023 - M. Caboose, Sans, Toriel, Flowey
Sonic in Undertale by Archaeopteryx108 reviews
(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: 5 - Words: 5,450 - Reviews: 3 - Favs: 9 - Follows: 11 - Updated: 8/30 - Published: 6/17/2022 - Sonic, Frisk, Chara
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: 24 - Words: 143,768 - Reviews: 6 - Favs: 34 - Follows: 36 - Updated: 8/29 - Published: 2/8/2021 - [Yuya S., Frisk] [Yuzu H., Asriel]
Undertale: Memento Mori, Unus Annus! by bopdog111 reviews
In the aftermath of Frisk breaking the barrier of Mt. Ebott, and becoming the Ambassador of Monsters, he has a new goal in life; to one day make up with his brother Ken, and not let him down. Arriving back at Tatsumi Port Island later, Frisk, and his friends alongside Asriel, and Chara both back to normal find the Shadows, and join S.E.E.S to stop them. MaleFrisk FemaleChara
Crossover - Persona Series & Undertale - Rated: T - English - Supernatural/Adventure - Chapters: 3 - Words: 25,421 - Reviews: 1 - Favs: 13 - Follows: 11 - Updated: 8/27 - Published: 8/3 - Mitsuru K., Minako A./Hamuko Y., Frisk, Chara
In All The Wrong Places by Zetic reviews
Long after the Human-Monster war, the surface fell into a state of total chaos and became an unending nightmare. The eighth human, someone broken and reshaped by that nightmare, is about to enter the Underground, and is bringing far more than a simple stick or dull kitchen knife... Soulsborne Series crossover AU, OC Undead protagonist.
Crossover - Dark Souls & Undertale - Rated: M - English - Adventure/Romance - Chapters: 37 - Words: 192,699 - Reviews: 236 - Favs: 634 - Follows: 667 - Updated: 8/21 - Published: 10/27/2015 - [Wanderer, Toriel] Asriel
Hero of the nights tide Undyne! by Howeverhell reviews
This is a MHA X Undertale story. 20 years before the canon of my hero acidemia a girl is born with deep blue skin, shining scales, glowing yellow eyes, teeth sharp as razors and claws to match. due to no fault of her own this girl is given up for adoption mere days after her birth. and this is the story of that young girl and how she became a true hero
Crossover - My Hero Academia/僕のヒーローアカデミア & Undertale - Rated: T - English - Adventure/Humor - Chapters: 1 - Words: 8 - Reviews: 1 - Favs: 7 - Follows: 11 - Published: 8/20
Fallen Spider by Cap10FroggerGuy reviews
When Peter Parker wakes up in some strange cavern after a long fall, he quickly finds the world he is in is full of monsters: Most friendly, but a few wanting him dead. Along with a snarky disembodied voice, he travels this world to find his way home... hopefully in one piece. NOTE: Spoilers for Undertale and FFH. I have also made Chara specifically female for simplicity's sake.
Crossover - Avengers & Undertale - Rated: T - English - Adventure/Friendship - Chapters: 37 - Words: 65,404 - Reviews: 64 - Favs: 117 - Follows: 103 - Updated: 8/13 - Published: 5/22/2020 - Complete
Redemption is a world away by W.D. Helvectic reviews
Finding himself in a new body after committing suicide, Akaza sees the struggle of survival through the memories of his new body. He never thought he could redeem himself, but the opportunity seemed to be a gift from the very gods that had forsaken him long ago. Hopefully, this time around he can be worthy to join Koyuki in the after-life.
Crossover - Undertale & Demon Slayer: Kimetsu No Yaiba - Rated: T - English - Hurt/Comfort/Humor - Chapters: 2 - Words: 5,208 - Reviews: 1 - Favs: 6 - Follows: 7 - Updated: 7/20 - Published: 4/10 - Papyrus, Sans
Forsaken Light by La fille du Temps reviews
After a nearly infinitly RESET genocide run, StoryShift!Chara wake up at the surface, changed from her memories and mostly unknown. Under the surveillance of the heroes, she'll wander in the heroe's lands with a new emotion filling her SOUL. (StoryShift!Chara. SS!Chara. Fem!Chara. Potential yuri.) (Rated M for future darker moment and atmosphere)
Crossover - My Hero Academia/僕のヒーローアカデミア & Undertale - Rated: M - English - Chapters: 1 - Words: 1,455 - Reviews: 5 - Favs: 13 - Follows: 23 - Published: 7/16 - Toshinori Y./All Might, Shouta A./Eraserhead, 1-A Students, Chara
Re:Darkness by AMGv12321 reviews
A young man is being ripped out of his universe just like how Natsuki Subaru was supposed to, but in it's way through the void Satella's magic lost grasp of him, the void started consuming him but before he was kill, something changed.
Crossover - Undertale & Re:Zero - Rated: M - English - Romance/Adventure - Chapters: 1 - Words: 1,391 - Reviews: 2 - Favs: 1 - Follows: 1 - Published: 7/16 - OC, Gaster, Emilia, Rem
Undertale multiverse meets with my hero academia by wolffrankie.14 reviews
What would happen if the Undertale multiverse collided with the My Hero Academia multiverse? First off, I may not continue the story. I'm just trying to practice, so don't expect any more. But if people like the idea, I can try.
Crossover - Undertale & My Hero Academia/僕のヒーローアカデミア - Rated: T - English - Mystery/Drama - Chapters: 1 - Words: 250 - Reviews: 3 - Favs: 2 - Follows: 4 - Published: 7/6 - Sans, All For One, Izuku M., Toshinori Y./All Might - Complete
Hiccup the flower by TheFuriousNightFury reviews
What would happen if Flowey came to the HTTYD world? (This story needs serious work)
Crossover - How to Train Your Dragon & Undertale - Rated: K - English - Chapters: 5 - Words: 5,990 - Reviews: 7 - Favs: 13 - Follows: 14 - Updated: 7/2 - Published: 12/22/2016 - Hiccup, Flowey
An Underground Trip by BirdWatcher2 reviews
This is a story of Percy Jackson falling into the world of Undertale sometime after the Heroes of Olympus series. He goes through the journey of the game you know, but with some twists along the way. When Sans comes face-to-face with Percy Jackson and sees his insanely high level, how will he react? And what will Percy decide? Find out if you wish.
Crossover - Percy Jackson and the Olympians & Undertale - Rated: K+ - English - Angst/Humor - Chapters: 14 - Words: 24,031 - Reviews: 5 - Favs: 38 - Follows: 40 - Updated: 6/30 - Published: 8/6/2022 - Percy J., Sans, Toriel - Complete
Strykertale by Charisonic558 reviews
This small spinoff story of "Journey of a Saiyan" follows Stryker; a human with the ability to manipulate ki who manages to find himself in the underground and is on a quest to escape and free everyone. He'll need all the determination he has to make it through without the help of Cherik at his side.
Crossover - Dragon Ball Z & Undertale - Rated: T - English - Adventure/Friendship - Chapters: 9 - Words: 30,465 - Reviews: 2 - Favs: 5 - Follows: 8 - Updated: 6/26 - Published: 5/27/2017 - Complete
When a Rose has to choose between two Thorne's by annie4life
When Rose Bakugo comes home for a vacation she has a choice to make , will she be able to make the right choice I don't own my hero or Undertale I just own Rose my oc Full credit for the summer goes to my friend Dillon editing is done by him and one other friend of mine.
Crossover - My Hero Academia/僕のヒーローアカデミア & Undertale - Rated: T - English - Adventure/Romance - Chapters: 4 - Words: 4,009 - Favs: 1 - Follows: 1 - Published: 6/21 - Katsuki B., 1-A Students, OC, Sans
To Remember by Maazen reviews
He just wanted to leave it all behind and when he thought that his death gave him exactly that, a reprieve from the family he hated, he woke up again. Well, if they cant reach him and only memories remain, then maybe, just maybe he can start over. Maybe he can live a life free of solitude and hatred. Yes, that sounds nice. Gamer/OC Harem
Crossover - High School DxD/ハイスクールD×D & Undertale - Rated: M - English - Adventure/Supernatural - Chapters: 6 - Words: 60,011 - Reviews: 40 - Favs: 166 - Follows: 226 - Updated: 6/18 - Published: 5/27
Sum Of Parts by RpgNot reviews
They had just died, he had just woken up in his own mind and they were just created an hour ago. Now, after some messing around by a higher power, all three end up in the same body with a system that entered lockdown mode after having its connection with the host severed. Now, they have to figure out how to get their own bodies while also having to put in effort for once.
Crossover - High School DxD/ハイスクールD×D & Undertale - Rated: T - English - Adventure/Angst - Chapters: 1 - Words: 10,439 - Reviews: 1 - Favs: 7 - Follows: 7 - Published: 6/18 - OC, Papyrus, Sans
Stupid Dance Forbidden by Yoshizilla-Rhedosaurus
Meloetta gets hungry and wants to have a bunch of spider cookies from Muffet who challenges her to a match.
Crossover - Pokémon & Undertale - Rated: T - English - Fantasy/Humor - Chapters: 1 - Words: 531 - Published: 5/20 - Meloetta, Muffet
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 - Updated: 5/1 - Published: 5/21/2022 - Kai, Sans, Toriel, Flowey
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