Undertale Crossovers
Filters
1.7K | Page 1 2 3 4 11 .. Last Next »

Hopes, Dreams, And DELTARUNE, Book 2: Cyber World by Dragonsrule18 reviews
Frisk and Susie are left reeling from their adventures in the Dark World, but there's no time to take a deep breath. As the Knight blows another fountain open, Frisk and Susie, along with little sister Tina, Berdly and Noelle, must seal it and stop an "evil" queen from taking over. And who is the man beckoning from Frisk's dreams, the one who speaks in hands?
Crossover - Undertale & Deltarune - Rated: T - English - Adventure/Friendship - Chapters: 8 - Words: 50,904 - Reviews: 29 - Favs: 10 - Follows: 9 - Updated: 2h - Published: 1/8 - Frisk, Noelle Holiday, Ralsei, Susie
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: 12 - Words: 76,727 - Reviews: 2 - Favs: 15 - Follows: 13 - Updated: 10h - Published: 2/8/2021 - [Yuya S., Frisk] [Yuzu H., Asriel]
Hogwarts Determination: The Chamber of Secrets by sparrow0sborne
Frisk Dreemur is entering her second year when all of a sudden, fellow muggle borns are being petrified, and blood messages start appearing on the wall. As muggle born Slytherin, Frisk doesn't know if she is safe or not...
Crossover - Undertale & Harry Potter - Rated: K+ - English - Fantasy/Friendship - Chapters: 3 - Words: 9,859 - Favs: 2 - Follows: 1 - Updated: 14h - Published: 2/23
Hogwarts School of Magic and Monsters! by LeahLovesPotterUndertale reviews
A young girl named Arial discovers she is a halfling. Half witch, half skeleton. This is her story. There will be adventure, horror, and most of all, skeleton puns. Sans and Arial are sister and brother, and the first few chapters will be not that Undertale-y. I will try my best. This is my second fanfic. (other is still in progress also btw). My OC is in the place of Harry.
Crossover - Harry Potter & Undertale - Rated: T - English - Humor/Adventure - Chapters: 6 - Words: 4,065 - Reviews: 3 - Favs: 2 - Follows: 4 - Updated: 22h - Published: 1/21 - Hermione G., Dudley D., Sans, Flowey
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: 15 - Words: 108,623 - Reviews: 3 - Favs: 15 - Follows: 11 - Updated: 2/24 - Published: 9/11/2020 - Ryoga K./Shark, Rio K., OC, Frisk
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: CosmicPixel (Twitter)
Crossover - Undertale & Cuphead - Rated: K+ - English - Adventure/Fantasy - Chapters: 5 - Words: 37,660 - Reviews: 1 - Favs: 14 - Follows: 7 - Updated: 2/23 - Published: 7/16/2021 - Papyrus, Sans, Cuphead, Mugman
Hogwarts Determination: The Sorcerer's Stone by sparrow0sborne reviews
Frisk, Chara and Asriel were your typical human and monster children raised by monsters. Until they recieve a letter letting them know they have been accepted in Hogwarts School of Witchcraft and Wizardry!
Crossover - Undertale & Harry Potter - Rated: K+ - English - Fantasy/Friendship - Chapters: 15 - Words: 39,374 - Reviews: 1 - Favs: 3 - Follows: 6 - Updated: 2/23 - Published: 2/15 - Complete
LOUDERTALE but my version by Loudcrowd111 reviews
Lincoln discovers a legend about a mysterious mountain, he tried to prove to his sisters than the legend is true, but lincoln ends up falling into the underground, will Lincoln ever return?
Crossover - Loud House & Undertale - Rated: T - English - Adventure/Hurt/Comfort - Chapters: 30 - Words: 103,899 - Reviews: 27 - Favs: 30 - Follows: 35 - Updated: 2/21 - Published: 9/4/2021 - Lincoln L.
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: 10 - Words: 21,771 - Reviews: 18 - Favs: 72 - Follows: 97 - Updated: 2/19 - Published: 5/7/2021 - [H. Issei, Ravel P.] Yubelluna, Orange Soul
UnderPiece! The Story of The Upcoming Pirate Queen! 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 - Fantasy/Hurt/Comfort - Chapters: 64 - Words: 348,680 - Reviews: 1 - Favs: 3 - Follows: 5 - Updated: 2/16 - Published: 2/8 - Frisk, Sans, Undyne, Muffet
Paranormal Academia (Version réécrite) by MonstaLia reviews
La vie de Léa change du tout au tout quand des monstres surgissent de nulle part pour l'attaquer et qu'elle se retrouve contrainte de vivre dans une académie loin des humains.
Crossover - Slender & Undertale - Rated: M - French - Adventure/Horror - Chapters: 26 - Words: 94,041 - Reviews: 1 - Updated: 2/15 - Published: 2/7/2020
Shattered and Broken, I Will Never Leave by MistraltheSkelegirl reviews
Dr. W. D. Gaster has been in the Void for years, and has come to terms to the fact that he can't be seen or heard by anyone. But when one broken child can see him, he stays with them, and becomes the one to heal their broken Soul. FemHarry, Fatherly!Gaster, Manip!Dumbles. Please Review!
Crossover - Harry Potter & Undertale - Rated: T - English - Family - Chapters: 2 - Words: 780 - Reviews: 18 - Favs: 108 - Follows: 135 - Updated: 2/15 - Published: 2/10/2020 - Harry P., Hedwig, Gaster
Dream Potter? Wait, WHAT! by MistraltheSkelegirl reviews
Dream and Nightmare weren't actually related, though no one else knew that but them. So what happens when Dream's original world brings her back? Will they be ready to deal with her and all the crazy that decided to follow? Fem!Dream, Fem!Harry, BigBrother!Nightmare, and Multiships, including Cream and Insomnia. Now cross-posted on Wattpad.
Crossover - Harry Potter & Undertale - Rated: T - English - Adventure/Family - Chapters: 10 - Words: 12,539 - Reviews: 73 - Favs: 215 - Follows: 228 - Updated: 2/15 - Published: 1/11/2020 - Harry P., Albus D., Luna L., Sans
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: 11 - Words: 23,460 - Reviews: 12 - Favs: 7 - Follows: 6 - Updated: 2/10 - Published: 6/13/2021 - [Zane, Mettaton Ex] Alphys, Asgore D.
Genietale by Dream Dragoness reviews
Centuries ago, the people of Ebbot Island fought a terrible war with monsters, sealing them under Mount Ebbot and earning the ire of Sequin Land. Frisk, a young half-genie, received visions about the war and a feeling telling her to go to the mountain, only for her to fall into the monster kingdom. Now, Frisk must travel the Underground, harness her magic, and find a way home.
Crossover - Shantae & Undertale - Rated: T - English - Adventure/Fantasy - Chapters: 3 - Words: 14,541 - Reviews: 4 - Favs: 5 - Follows: 4 - Updated: 2/8 - Published: 5/9/2021 - OC, Shantae, Frisk, Flowey
Maelstromtale by hussbek reviews
Stories speak of a mountain where children have gone and never returned, unknown of the mystery which lies within it. Now history repeats itself as a child falls but with a twist as another joins...and to think a mild stroll got him into something thought of as fairy tales.
Crossover - Naruto & Undertale - Rated: T - English - Adventure/Supernatural - Chapters: 13 - Words: 96,034 - Reviews: 107 - Favs: 267 - Follows: 312 - Updated: 2/8 - Published: 5/25/2020 - Naruto U., Frisk
Deathbattle! Undertale vs Xenoblade Chronicles! by CrumpsCrumbs
Soul vs Heart! Magic vs Ether! Monsters vs Homs! It's time for a collection of Deathbattles between Undertale and Xenoblade Chronicles!
Crossover - Xenoblade Chronicles & Undertale - Rated: K+ - English - Friendship - Chapters: 6 - Words: 13,522 - Favs: 1 - Updated: 2/4 - Published: 1/28 - [Reyn, Papyrus] [Shulk, Sans] - Complete
The Storm of Eyes by TheOriginalWriterGuy reviews
/\A Two Kinds x Undertale Crossover/\ On the journey to the Basitin Isles, Trace's voyage is intercepted by a mysterious storm, which was not predicted by Captain Eric's navigator. Hesistant to stray too far off-course, they decide to brave the storm- only to find themselves seeing into another universe. There, they traverse into a world entirely hostile to them...
Crossover - Two Kinds & Undertale - Rated: T - English - Mystery/Adventure - Chapters: 22 - Words: 34,178 - Reviews: 23 - Favs: 9 - Follows: 9 - Updated: 2/3 - Published: 4/15/2021
Nostalgia Critic Eats Asriel by callofdutyFTWnintendoFTL reviews
The Nostalgia Critic is hungry and really wants to devour something, or someone, who will fill his stomach full.
Crossover - Jimmy Neutron & Undertale - Rated: M - English - Friendship/Suspense - Chapters: 1 - Words: 441 - Reviews: 1 - Published: 1/26 - Principal Willoughby, Asriel - Complete
Children of Darkness (Soul of Void) by LuAO0 reviews
For ages, the Void godness has to sit and see how her multiverse was fill and filled by AUs of her Universe, Undertale, she hated them at first, but now all her hate fall in their creator, Fate's spawn, Ink. Meanwhile, in another Multiverse, other Void God makes a deal with the ruler of Hallownest.
Crossover - Undertale & Hollow Knight - Rated: T - English - Hurt/Comfort/Family - Chapters: 12 - Words: 25,129 - Reviews: 8 - Favs: 36 - Follows: 43 - Updated: 1/26 - Published: 1/31/2021 - Sans, The Hollow Knight, the Knight
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: 4 - Words: 7,505 - Reviews: 1 - Favs: 1 - Follows: 2 - Updated: 1/25 - Published: 1/16 - Frisk, OC, Sans, Chara
The Void Altar by Ghosttheknight
In the deepnest Ghost and Den found a void altar unlike The Shade Lord Void this one is different, they jump into and found Ink and Erorr fight...
Crossover - Undertale & Hollow Knight - Rated: T - English - Chapters: 1 - Words: 1,434 - Favs: 1 - Follows: 1 - Published: 1/25
Journey of SOUL's by Dasansi reviews
When Harry is whisked away into UNDERTALE's dimension, what happens when he meets Frisk. What happens when Frisk looks to him for guidance. Will he change the underground for better or worse? Xover Harry Potter and Undertale.
Crossover - Harry Potter & Undertale - Rated: T - English - Hurt/Comfort/Adventure - Chapters: 8 - Words: 14,058 - Reviews: 14 - Favs: 25 - Follows: 30 - Updated: 1/20 - Published: 12/7/2021 - Harry P., Frisk, Sans, Flowey
Multiversal Christmas by Professor Orio
Temporary file, to be deleted soon
Crossover - Steven Universe & Undertale - Rated: T - English - Humor - Chapters: 1 - Words: 11,544 - Favs: 2 - Published: 1/18 - Complete
Skeleton monster of Beacon by CykaBlyatintensifies reviews
During the absolute genocide run, Sans killed the human. Instead of letting their soul shatters, he took the shards and absorbed it. After absorbing the soul, he turned into a human and absorbed the other 7 to break the barrier. He then found himself in an anime-ish world. Now, he must fight against a darkness that lingers in this world. Finally, the art is not mine.
Crossover - RWBY & Undertale - Rated: T - English - Humor/Hurt/Comfort - Chapters: 23 - Words: 67,985 - Reviews: 50 - Favs: 201 - Follows: 246 - Updated: 1/16 - Published: 9/28/2020 - Sans, Team RWBY, Team JNPR, Chara
1.7K | Page 1 2 3 4 11 .. Last Next »