Undertale Crossovers
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Batmantale by AlithiaSigma reviews
Batman finds himself in the Underground with nothing but his clothes and the drive to continue on. Really, it's Batman in Undertale. And Batman does have one power. He never gives up.
Crossover - Batman & Undertale - Rated: T - English - Chapters: 9 - Words: 16,801 - Reviews: 116 - Favs: 131 - Follows: 194 - Updated: 10/6 - Published: 2/21/2016 - Bruce W./Batman, Sans
LoudTale by Scourge7
What happens when three kids fall into Mt. Ebott? What will they do? How will they survive? And most importantly, how will their choices affect everything? Find out in this tale...LoudTale
Crossover - Undertale & Loud House - Rated: T - English - Adventure/Humor - Chapters: 1 - Words: 4,212 - Favs: 4 - Follows: 5 - Published: 10/6
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: 21 - Words: 33,644 - Reviews: 16 - Favs: 10 - Follows: 9 - Updated: 10/5 - Published: 6/13/2021 - [Zane, Mettaton Ex] Alphys, Asgore D. - Complete
Ancient Magickes by Flying Dragonite reviews
"Legend has it, an 'angel' who has seen the surface will descend from above and bring us freedom." Upon Harry Potter's 16th birthday, he finds himself receiving a creature inheritance of such monumental importance, that he may be the key to peace between monsters and humans, purebloods and muggleborns, wizards and muggles. And he had always said he simply wanted to be "just Harry".
Crossover - Harry Potter & Undertale - Rated: T - English - Hurt/Comfort/Angst - Chapters: 25 - Words: 42,207 - Reviews: 159 - Favs: 717 - Follows: 807 - Updated: 10/3 - Published: 12/28/2016 - Harry P., Papyrus, Sans, Chara
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: 66 - Words: 229,162 - Reviews: 2159 - Favs: 2,271 - Follows: 2,575 - Updated: 9/30 - Published: 8/1/2016 - Sirius B., Sans
republictale: uncharted wasteland by bigswaggy123
a couple weeks after the continent warped into their realty the throupel were spending their time before they left . now with a war on their hands they set out with the 2 stand users who warped into their world Okusayu and Josuke to explore this continent.( mainly undertale but mlp , Jojos bizarre adventures, fallout) ( art by /users/w3ndig0
Crossover - My Little Pony & Undertale - Rated: M - English - Romance/Drama - Chapters: 32 - Words: 58,866 - Favs: 1 - Follows: 1 - Updated: 9/30 - Published: 3/30/2021 - [Alphys, Sans, Undyne] Frisk
Titantale by Kaiju Enjoyer reviews
Frisk has freed the monsters from the underground, and a new era is about to begin. But the monsters are about to return to a world very different from the one they left when they were imprisoned. A world that has changed the moment humans learned a thing that the monsters will learn too: that this world always belonged to Godzilla, and that humans and monsters just lived in it.
Crossover - Godzilla & Undertale - Rated: T - English - Adventure/Fantasy - Chapters: 2 - Words: 3,797 - Reviews: 4 - Favs: 11 - Follows: 10 - Updated: 9/27 - Published: 9/16
SnAns and read Riding hood sace the e with Nostalgia Crittc by MrTheB reviews
This sotory has unintentional duaguise vore, Napolean Bonapaet speaking english ,mental issues, crowdfunded warships, dark but not evil Peter Griffin, plastic guns, santaclause , hewvyjanded shipping, Apollo Justice, emotioanl truama from DDLC (this was written in 2019.),and sasquaches brutal death. AND DOCTOR CHIEMRA!
Crossover - Little Red Riding Hood & Undertale - Rated: T - English - Humor/Parody - Chapters: 12 - Words: 12,049 - Reviews: 1 - Updated: 9/25 - Published: 7/5 - Sans
Cuptale (CupheadxUndertale) by Kale Bishop reviews
Mt Abott suddenly appears out of nowhere and Cuphead, dragging Mugman along, runs to the mountain to investigate. Soon they fall into the chasm and are attacked by the monsters of the underground. As they explore, they discover a tragedy that befell the underground, make friends along the way, and have a bro jolly fun adventure of a lifetime. Cover photo by me.
Crossover - Undertale & Cuphead - Rated: K+ - English - Adventure/Fantasy - Chapters: 8 - Words: 57,526 - Reviews: 4 - Favs: 25 - Follows: 21 - Updated: 9/23 - Published: 7/16/2021 - Papyrus, Sans, Cuphead, Mugman
The Mountain of two Legends! by bopdog111
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: 7 - Words: 36,244 - Favs: 4 - Follows: 5 - Updated: 9/22 - Published: 6/30 - Dragonborn/Dovahkiin, Delphine, Frisk, Chara
Brave Devil Fist by Son of Nightmare reviews
Before crashing the wedding, Issei has been having dreams of another life. A life of talking skeletons and fighting monsters. He now wishes to regain his memories and help those that truly need a true king, Ravel and others. His SOUL is filled with BRAVERY. (Evil Rias and Dusttale Sans) Martial Artist Issei! Issei x Ravel x Riser's Peerage Harem
Crossover - High School DxD/ハイスクールD×D & Undertale - Rated: M - English - Adventure/Romance - Chapters: 13 - Words: 26,847 - Reviews: 20 - Favs: 98 - Follows: 122 - Updated: 9/22 - Published: 5/7/2021 - [H. Issei, Ravel P.] Yubelluna, Orange Soul
DoubleTale: When Devils Cry by lmao-imdeadaf reviews
21 iterations of W.D Gaster each brought a child with unlimited potential through from our world to theirs. These are the ones we know of. Somewhere, not too far from The Angel's own 'verse, another child is brought in, along with a few other…things. (Or, I'm a nerd so I inserted myself into a DT fic with DMC crap.) / ON HIATUS DUE TO PERSONAL SHIT - WILL CONTINUE AS SOON AS ABLE
Crossover - Undertale & Devil May Cry - Rated: T - English - Humor/Fantasy - Chapters: 5 - Words: 8,670 - Reviews: 1 - Favs: 2 - Follows: 3 - Updated: 9/20 - Published: 1/16 - Frisk, OC, Sans, Chara
The Eight-Legged Bootlegger! by MULTUS reviews
Muffet D. Baker, a Spider-Girl in a world where there are pirates, ability-giving fruits, government oppression, and infinite islands must strive and try her hardest to claim the title Queen of The Pirates by finding the treasure that W. D. Gaster left! Collecting crewmates on her voyages, she will make sure that her extinct race may someday flourish. That is her wish as a pirate!
Crossover - One Piece & Undertale - Rated: M - English - Adventure/Fantasy - Chapters: 67 - Words: 369,558 - Reviews: 1 - Favs: 13 - Follows: 17 - Updated: 9/19 - Published: 2/8 - Frisk, Sans, Muffet, Gaster
MoniTale by Joker the prince of all crime reviews
"This was never meant to happen, you should have just brought them back." Player said as he went to delete her , but then something caught his eye. The Monika lover smiled as he looked at the Heart. "Maybe you can still learn." He moved her file over to UNDERTALE and opened it's files. He was finding a spot to put her, hovering over Frisk's. Then the lightning struck them..
Crossover - Undertale & Doki Doki Literature Club - Rated: T - English - Adventure/Hurt/Comfort - Chapters: 22 - Words: 87,315 - Reviews: 151 - Favs: 207 - Follows: 262 - Updated: 9/15 - Published: 2/21/2018
Digitale by Razorwolfie
A crossover fanfiction of Digimon and Undertale, I have been thinking about this for a long time, so I decided to make this fanfic. This also happens to be my first fanfic so it's probably not that good, but I hope you enjoy it regarless.
Crossover - Digimon & Undertale - Rated: T - English - Adventure/Fantasy - Chapters: 1 - Words: 9,824 - Published: 9/3 - [Lunamon, Shoutmon] Toriel, Flowey
Corpse And Decay by Anime0CC0Manga
The Minus Among Minuses And The Cute Loveless Has Taken Quite The Fall Underground (I Own Nothing)
Crossover - Medaka Box/めだかボックス & Undertale - Rated: K - English - Adventure/Fantasy - Chapters: 1 - Words: 1,124 - Favs: 5 - Follows: 4 - Published: 9/2 - M. Kumagawa, Mukae E., Papyrus, Sans
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: 4 - Words: 3,605 - Favs: 5 - Follows: 4 - Updated: 9/1 - Published: 6/17 - Sonic, 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: 3 - Words: 10,608 - Reviews: 34 - Favs: 81 - Follows: 104 - Updated: 8/31 - Published: 5/7 - Sans, Alastor, Charlie, Blitzo
TALE, told True by Razaraga
A Nation, left with it's King dead. A Village, with a pariah about to be tried. A Child, desperate for love. And a Queen, longing for children. I wonder... what do these have in common?
Crossover - X-overs & Undertale - Rated: M - English - Chapters: 2 - Words: 1,816 - Favs: 1 - Follows: 1 - Updated: 8/30 - Published: 7/3 - OC, Toriel
The Evil of Principal Willaby by callofdutyFTWnintendoFTL
The horror of Principal Willaby is truly horrifying.
Crossover - Jimmy Neutron & Undertale - Rated: M - English - Horror/Angst - Chapters: 1 - Words: 1,058 - Published: 8/28 - Principal Willoughby, Asriel, Toriel, Asgore D. - Complete
Sinstale by Pikachu the critic
Taking under a nickname, you explore the underground where the demons were sealed. Will you make peace with them or make them face true wrath? The choice is yours.
Crossover - Seven Deadly Sins/七つの大罪 & Undertale - Rated: T - English - Adventure/Supernatural - Chapters: 2 - Words: 2,349 - Updated: 8/28 - Published: 8/24
Unwavering Will in the Sea by dafid1 reviews
What if Frisk from Undertale went to the world of One Piece? See what happens as Frisk goes on a new adventure!
Crossover - One Piece & Undertale - Rated: K+ - English - Adventure/Friendship - Chapters: 59 - Words: 87,986 - Reviews: 43 - Favs: 166 - Follows: 170 - Updated: 8/28 - Published: 11/28/2020 - Luffy, Frisk
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: 17 - Words: 104,575 - Reviews: 2 - Favs: 19 - Follows: 17 - Updated: 8/16 - Published: 2/8/2021 - [Yuya S., Frisk] [Yuzu H., Asriel]
Error 404 is curious about MHA by wolffrankie.14 reviews
error 404 finds out about my hero Academia, and is curious about the world and even surprised. but he isn't one of the first undertale gods to find out about this universe.
Crossover - My Hero Academia/僕のヒーローアカデミア & Undertale - Rated: T - English - Chapters: 8 - Words: 3,780 - Reviews: 1 - Favs: 2 - Follows: 2 - Updated: 8/13 - Published: 8/9
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: 5 - Words: 5,638 - Reviews: 5 - Favs: 20 - Follows: 24 - Updated: 8/12 - Published: 6/5
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