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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: 65 - Words: 225,069 - Reviews: 2131 - Favs: 2,208 - Follows: 2,522 - Updated: 17h - Published: 8/1/2016 - Sirius B., Sans
A Devil May Fall by Burning burning burning reviews
"What is good? Everything that heightens the feeling of power in man, the will to power, power itself. What is bad? Everything that is born of weakness. What is happiness? The feeling that power is growing, that resistance is overcome. Not contentedness but more power; not peace but war; not virtue but fitness." Yet... is sanity, the price to pay... For this power? Vergil?
Crossover - Devil May Cry & Undertale - Rated: M - English - Spiritual/Adventure - Chapters: 14 - Words: 115,227 - Reviews: 34 - Favs: 32 - Follows: 44 - Updated: 18h - Published: 6/16 - Vergil, Chara, Asgore D., Alphys
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: 58 - Words: 86,847 - Reviews: 38 - Favs: 152 - Follows: 154 - Updated: 7/17 - Published: 11/28/2020 - Luffy, Frisk
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: 16 - Words: 106,895 - Reviews: 137 - Favs: 309 - Follows: 358 - Updated: 7/15 - Published: 5/25/2020 - Naruto U., Frisk
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: 6 - Words: 6,105 - Reviews: 1 - Updated: 7/15 - Published: 7/5 - Sans
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: 30 - Words: 111,757 - Reviews: 1 - Updated: 7/15 - Published: 2/7/2020
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: 15 - Words: 33,469 - Reviews: 8 - Favs: 49 - Follows: 59 - Updated: 7/14 - Published: 1/31/2021 - Sans, The Hollow Knight, the Knight
Aster Chronicles: Convergence by Eraclese reviews
Those who would tamper with fate will meet one beyond their hopes and despair. Those who would seek to make a better world will always have the misfortune of never living within it. Some might not have a choice, however. A choice to live a happy life. A choice to tamper with fate. Or a choice to destroy the world. Not all are fortunate enough to choose their fates.
Crossover - RWBY & Undertale - Rated: K - English - Adventure/Fantasy - Chapters: 1 - Words: 1,929 - Reviews: 6 - Favs: 15 - Follows: 19 - Updated: 7/11 - Published: 2/5/2021
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: 25 - Words: 74,872 - Reviews: 52 - Favs: 222 - Follows: 267 - Updated: 7/10 - Published: 9/28/2020 - Sans, Team RWBY, Team JNPR, Chara
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: 15 - Words: 32,005 - Updated: 7/8 - Published: 3/30/2021 - [Alphys, Sans, Undyne] Frisk
Copy Cat! Or Bear- by GlitterdragonTGPOU YT
Fredbear had been through a lot in the underground, and now Springbonnie is no longer the person he once knew... but Fredbear learns there's a monster that can help.
Crossover - Undertale & Five Nights at Freddy´s - Rated: T - English - Angst - Chapters: 1 - Words: 1,159 - Published: 7/7 - Fredbear, Springtrap - Complete
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: 21 - Words: 81,820 - Reviews: 148 - Favs: 199 - Follows: 249 - Updated: 7/7 - Published: 2/21/2018
Minami American General Highschool - New Beginning by maken.bialy2
After leaving BC Freedom Academy because of it's toxicity, Andou had to find a new answer to the troublesome necessity of finding herself a highschool. And what place could be the answer if not ambitious highschool far away south with talented students, questionably powerful leader and new Sensha-do team being created from leftovers? (AU after Das Finale)
Crossover - Girls und Panzer/ガールズ&パンツァー & Undertale - Rated: T - English - Adventure/Friendship - Chapters: 20 - Words: 53,889 - Favs: 4 - Follows: 3 - Updated: 7/6 - Published: 4/2 - [OC, Andou] Rosehip, Eclair
Madokatale by Finalcool720
in this tale madoka falls down into the underground and has the power to save and reset and each time she does someone else is with her and monsters do not want to fight her ( M for future chapters )
Crossover - Puella Magi Madoka Magica/魔法少女まどか★マギカ & Undertale - Rated: M - English - Chapters: 3 - Words: 2,448 - Favs: 1 - Follows: 1 - Updated: 7/5 - Published: 3/31/2021 - Madoka K., Frisk, Flowey
Crimson Hunt by TheOriginalTale reviews
When a hiking accident sends Frisk to the depths of Mount Ebott, he's forced to adapt to his new surroundings. Meanwhile a restless prince seeks for adventure...and a new visitor just might provide the means to fulfill his cravings.
Crossover - Undertale & Deltarune - Rated: T - English - Adventure/Fantasy - Chapters: 17 - Words: 33,977 - Reviews: 2 - Favs: 7 - Follows: 13 - Updated: 7/5 - Published: 9/28/2021
UnderShield by Bloodwolf11 reviews
Naofumi ends up in the Underground with no idea how he got there or what he was trying to do before that. What will he do in a world where the monsters are trapped and the key to their freedom is taking his soul?
Crossover - Rising of the Shield Hero/盾の勇者の成り上がり & Undertale - Rated: T - English - Fantasy/Humor - Chapters: 6 - Words: 39,751 - Reviews: 29 - Favs: 130 - Follows: 162 - Updated: 7/4 - Published: 9/12/2021 - Naofumi I., Papyrus, Sans, Toriel
A Rabbit In The Underground by SbOcean reviews
The Underground had seen an incalculable number of resets. Frisk, Sans and Flowey are tired of each reset, but in one reset, two new people fall into the Underground. Will these two break the cycle or will they become a part of it?
Crossover - Five Nights at Freddy´s & Undertale - Rated: T - English - Horror/Family - Chapters: 5 - Words: 8,335 - Reviews: 7 - Favs: 14 - Follows: 15 - Updated: 7/3 - Published: 5/19 - Vanny/Reluctant Follower, Gregory, Frisk, Sans
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: 1 - Words: 891 - Follows: 1 - Published: 7/3 - OC, Toriel
Cuphead In Undertale by jdeese
What if Mt.Ebbot was in Inkwell Isle 3
Crossover - Cuphead & Undertale - Rated: M - English - Adventure/Supernatural - Chapters: 1 - Words: 188 - Published: 7/2 - Cuphead
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: 5 - Words: 28,255 - Favs: 3 - Follows: 3 - Published: 6/30 - Dragonborn/Dovahkiin, Delphine, Frisk, Chara
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?(MAJOR UPDATE TO Ch 13)
Crossover - Undertale & Deltarune - Rated: T - English - Adventure/Friendship - Chapters: 13 - Words: 91,606 - Reviews: 47 - Favs: 14 - Follows: 16 - Updated: 6/30 - Published: 1/8 - Frisk, Noelle Holiday, Ralsei, Susie - Complete
I Am Frisk: An UndertaleWorm CYOA Story by Tempest2077 reviews
After waking up in the body of the protagonist of Undertale. The newly named Frisk has to find a way to deal with the consequences of actions he doesn't even remember taking. And find a way to not only save the underground, but also himself.
Crossover - Worm & Undertale - Rated: M - English - Adventure/Fantasy - Chapters: 7 - Words: 14,345 - Reviews: 4 - Favs: 24 - Follows: 30 - Updated: 6/28 - Published: 6/27 - OC, Papyrus, Sans, Toriel
The Duelist of Determination by Ulrich362 reviews
After freeing the monsters from the Underground what's next for young Frisk? Well, there's always the world's most popular trading card game Duel Monsters. With a deck based off of her adventures it's time for the monster ambassador to show everyone what she's made of. Though with dark forces around every corner, she'll need to remember one thing, always stay determined.
Crossover - Yu-Gi-Oh & Undertale - Rated: T - English - Chapters: 17 - Words: 18,125 - Reviews: 20 - Favs: 59 - Follows: 65 - Updated: 6/28 - Published: 7/9/2017
The Huntress Who Speaks In Hands by mamamimikyu64 reviews
Time. Space. Reality. It's more than a linear path. Far from the Remnant you know, there are infinite others, each only a fraction different. Here, we see the results of an astronomical fluke. One that granted a child the powers of the most powerful Monster who ever lived. I'd say more, but you know what they say. It's rude to talk about people who are listening.
Crossover - RWBY & Undertale - Rated: T - English - Fantasy/Romance - Chapters: 2 - Words: 1,896 - Reviews: 5 - Favs: 20 - Follows: 28 - Updated: 6/27 - Published: 6/24
HDAD-DR- Susie The Teddy Bear by Dragonsrule18 reviews
It's midnight in Castletown, and Frisk and Ralsei are asleep on the couch, using Susie as a pillow/teddy bear. Susie finds herself not minding. Just a little drabble set in my Hopes, Dreams, And DELTARUNE universe, sometime after the second book, though it can be read alone.
Crossover - Undertale & Deltarune - Rated: T - English - Friendship - Chapters: 1 - Words: 460 - Reviews: 3 - Favs: 4 - Follows: 3 - Published: 6/25 - Frisk, Ralsei, Susie - Complete
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