Undertale Crossovers
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Of Shadows and Hopes by Nadia42 reviews
Finally finding an escape from the world of Don't Starve, Wilson finds himself in a world unfamilliar from the one he knew before. He isn't alone, though, Frisk and the monsters he calls his family will be there. Somehow... Wilson P. Higgsbury knows this won't be as easy as keeping himself alive in his old prison.
Crossover - Don't Starve & Undertale - Rated: T - English - Adventure - Chapters: 45 - Words: 89,667 - Reviews: 21 - Favs: 52 - Follows: 58 - Updated: 10/25/2023 - Published: 4/18/2017 - Maxwell/William C., Wilson H., Frisk, Chara
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: 12 - Words: 45,044 - Reviews: 108 - Favs: 319 - Follows: 393 - Updated: 10/22/2023 - Published: 3/18/2022 - Jaune A., Undyne, Toriel, Asgore D.
We're Screwed by boredgrace23 reviews
Asgore finds an old, incomplete painting he did of a man playing the piano.
Crossover - Undertale & Deltarune - Rated: T - English - Angst/Romance - Chapters: 5 - Words: 24,394 - Reviews: 3 - Follows: 1 - Updated: 10/5/2023 - Published: 7/10/2023 - Asgore D., Gerson, Gaster, Kris Dreemurr
Unmei Force Shattered Heroes: Dawn of Despair by Xovercreator reviews
The X-Event finally makes their moves, as the member of the Unmei Force, as well as those of the Future Seekers, seek to pursue the X-Event, so that they can find X-Gaster, and put an end to his genocidal plans once and for all. However, it seems that their quest will not be without its own problems, and it's only a matter of time until Richard awakens...
Crossover - X-overs & Undertale - Rated: T - English - Chapters: 6 - Words: 78,560 - Reviews: 1 - Favs: 1 - Follows: 2 - Published: 10/2/2023 - Complete
When She Loved Me by Dragonsrule18 reviews
Every story has a beginning, and Frisk and Ralsei's childhood friendship is no exception. A collection of oneshots of Frisk and Ralsei's lives together, from when they met at five until they were separated at seven. Set as a prequel to the Hopes, Dreams, And DELTARUNE universe.
Crossover - Undertale & Deltarune - Rated: T - English - Friendship/Hurt/Comfort - Chapters: 2 - Words: 4,638 - Reviews: 1 - Favs: 3 - Follows: 3 - Published: 9/30/2023 - Frisk, Ralsei
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: 11 - Words: 59,433 - Reviews: 2 - Favs: 15 - Follows: 12 - Updated: 9/25/2023 - Published: 6/30/2022 - Dragonborn/Dovahkiin, Delphine, Frisk, Chara
Skeletal Shenanigans by Possession Unknown reviews
Once the monsters and Frisk left the Underground, after the events of the pacifist route they find themselves in Japan next to the small town of Kouh. The group decided they wanted to set up residence in Kouh, Now all they needed to do was greet the locals, Frisk being their ambassador... Turns out they seemed a bit monstrous themselves, well at least some of them.
Crossover - High School DxD/ハイスクールD×D & Undertale - Rated: M - English - Supernatural/Friendship - Chapters: 1 - Words: 2,325 - Reviews: 2 - Favs: 8 - Follows: 11 - Published: 9/23/2023 - Rias G., Frisk, Sans, Papyrus
Frisk Dreemurr and the Sorcerer's Stone by sparrow0sborne reviews
Frisk Dreemurr is an ordinary eleven year old girl, aside from the fact she freed all monster kind from the underground almost two years ago. But shortly after her eleventh birthday, she discovers something shocking. She's a magical witch and she's been accepted into Hogwarts School of Witchcraft and Wizardry!
Crossover - Harry Potter & Undertale - Rated: K+ - English - Fantasy/Adventure - Chapters: 1 - Words: 1,331 - Reviews: 3 - Favs: 4 - Follows: 7 - Published: 9/22/2023
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: 30 - Words: 208,349 - Reviews: 4 - Favs: 27 - Follows: 20 - Updated: 9/19/2023 - Published: 9/11/2020 - Ryoga K./Shark, Rio K., OC, Frisk
Antebellum by Novice Lowland reviews
After the events of Undertale, peace has been brought to the above ground and a new nation is formed. However, a Ebott science project goes wrong, Frisk going missing in the process and ending up in a strange new world. Sans going in to save them, what comes next is filled with slice of life fun and jaw dropping action. [Updates every Sunday]
Crossover - Touhou Project & Undertale - Rated: T - English - Adventure/Mystery - Chapters: 7 - Words: 25,945 - Reviews: 4 - Favs: 6 - Follows: 8 - Updated: 9/17/2023 - Published: 7/3/2023
Chocolate and Cinnamon by Scrappymocha reviews
What if Izuku had a dog called Mighty and didn't save bakugo? What if Chara wasn't some psychopathic demon and got teleported into Izuku's room? Well that happens in this fic. Looking for a better name lol.
Crossover - My Hero Academia/僕のヒーローアカデミア & Undertale - Rated: M - English - Chapters: 2 - Words: 2,541 - Reviews: 21 - Favs: 27 - Follows: 43 - Updated: 9/15/2023 - Published: 8/26/2023 - [Izuku M., Chara]
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: 40 - Words: 138,732 - Reviews: 1 - Updated: 9/15/2023 - Published: 2/7/2020 - Complete
Sierra by bayramlit7
Legendary Celeste Mountain. Mythical Mount Ebott. The tales of these two ancient places are over. But what about those who came out victorious from their depths? Their stories were far from over. Thanks to a twist of fate, Madeline embarks on an unexpected adventure that shatters the boundaries of her world and intersects with the path of the young ambassador of monsterkind.
Crossover - Undertale & Celeste - Rated: K - English - Friendship/Supernatural - Chapters: 1 - Words: 1,363 - Favs: 2 - Follows: 2 - Published: 9/10/2023
Into a New Reality by attripae reviews
After fighting in Chara's genocide run for what seemed like a lifetime now, Sans devised a new plan to get rid of the wraith, in the hopes of giving his brother a happier life. In doing so, there were unintentional side effects and Sans found himself in an entirely new world. Undertale—more specifically, Sans, meet the Marvel Cinematic Universe.
Crossover - Marvel & Undertale - Rated: K+ - English - Sci-Fi/Fantasy - Chapters: 37 - Words: 79,942 - Reviews: 10 - Favs: 68 - Follows: 90 - Updated: 9/8/2023 - Published: 2/7/2023 - Sans
A Monsoon Of Determenation by darkshadowmaverick
one night Monsoon who's married to sailor Pluto has a nightmare in which the aftermath requires the intervention of both Jack/Raiden & JetStream Sam and thats not even the half of it all...
Crossover - Metal Gear & Undertale - Rated: M - English - Drama/Tragedy - Chapters: 1 - Words: 1,600 - Published: 9/1/2023 - Monsoon, Frisk, Chara
The Surface by Polarfog
Monsters are freed from Mt. Ebott by a military group. Many monsters are already free, as Mt. Ebott monsters were freed last for being known as the most dangerous monsters. Can they adjust to a society critical of their merciless killings?
Crossover - Undertale & OMORI - Rated: T - English - Chapters: 8 - Words: 8,593 - Favs: 2 - Follows: 1 - Published: 8/30/2023 - Frisk, Sans - Complete
Meeting of the Worlds: Beneath the Multiverse by DouglasJack reviews
In a twist of fate, Ben Tennyson, the intergalactic hero, is transported from his cosmic battles to an unfamiliar underground w what will he do without friends and allies? Will he be able to stop his old enemies as they unite to defeat him? (only M rating because i thought about adding blood and profanity)
Crossover - Ben 10 & Undertale - Rated: M - English - Adventure - Chapters: 4 - Words: 23,279 - Reviews: 16 - Favs: 14 - Follows: 14 - Updated: 8/27/2023 - Published: 8/18/2023
Healing the Broken Soul Extras by Fallen Dreamer666 reviews
Oneshots, Worldbuilding, and Scrapped Chapters that don't fit within Healing the Broken Soul. Mainly stuff to tide y'all over if I'm having trouble getting a chapter up in the main fic. Will occasionally hold spoilers for the main fic
Crossover - Naruto & Undertale - Rated: M - English - Chapters: 2 - Words: 1,875 - Reviews: 2 - Favs: 1 - Follows: 3 - Updated: 8/22/2023 - Published: 7/28/2023
Amalgamation by Sengu de Janang
Hermaphroditus, pitiful Hermaphroditus Trapped in the true lab, Because they are "freakishly weird", Waiting for eternity, Hermaphroditus
Crossover - Greek Mythology & Undertale - Rated: T - English - Poetry - Chapters: 2 - Words: 581 - Published: 8/18/2023
TrueFate: Arc 0 by DarkSunsets
A crossover between Kagerou Project and Glitchtale. A scientific breakthrough in one, and an impossible tragedy in another. The first reset since the loop's end brings two worlds together, intertwining destinies... with someone pulling the strings behind the scenes.
Crossover - Kagerou Days/カゲロウデイズ & Undertale - Rated: T - English - Adventure/Sci-Fi - Chapters: 1 - Words: 1,135 - Favs: 1 - Published: 8/15/2023
Friends and family can be found in the most unlikely places by Dr.Bodymelt21
A series of one shots where I give Frederick and Sotpf!Freddie(Ember) actual good friends and found families that care for him. I take suggestions from readers on what characters you'd like to see our depressed prince/princess befriend and or be adopted by. I also take suggestions from Tumblr @yaminobean.
Crossover - Misc. Comics & Undertale - Rated: T - English - Humor/Adventure - Chapters: 3 - Words: 10,353 - Updated: 8/10/2023 - Published: 7/4/2023
LouderTale the series by Loudcrowd111 reviews
After completing the 2 main Undertale routes. Lincoln isn’t the same person anymore. As something happens to him that even slightly changes his appearance. How will his sisters react? Will they accept him for having determination powers after being gone for so long?
Crossover - Loud House & Undertale - Rated: T - English - Adventure/Suspense - Chapters: 12 - Words: 46,756 - Reviews: 23 - Favs: 23 - Follows: 27 - Updated: 8/8/2023 - Published: 9/4/2022 - Lincoln L., OC
Rising of the Motherly Shield by Pezil the Brazilian Writer reviews
after opening up a mysterious book she found in her bookshelf, Toriel is transported to a new world and she will have to protect it from the threat of the Waves, follow Toriel as she and the other three heroes make bonds and rivalries while adventuring (On hiatus for now. PS: don't spam or comment on things not related to the fanfic please)
Crossover - Rising of the Shield Hero/盾の勇者の成り上がり & Undertale - Rated: T - English - Fantasy/Adventure - Chapters: 11 - Words: 48,208 - Reviews: 48 - Favs: 170 - Follows: 212 - Updated: 8/7/2023 - Published: 3/7/2023 - Toriel, Rifana, Raphtalia
Healing the Broken Soul (New) by Fallen Dreamer666 reviews
What happens when Fem!Naruto falls in the Underground and stays with everyone's favorite Goat Mom? What changes and what stays the same?
Crossover - Naruto & Undertale - Rated: T - English - Chapters: 2 - Words: 2,765 - Reviews: 6 - Favs: 16 - Follows: 24 - Updated: 8/3/2023 - Published: 6/10/2023
(Not) Quirk Of Judgement by Burger Tower reviews
Imagine a world where every person with a Quirk is equal to every Quirkless one. A world where no one has to die. A world where Heroes and Villains don't have to exist and no civilian or innocent has to be in a crossfire... Such a world can exist, But everything comes at a price...
Crossover - My Hero Academia/僕のヒーローアカデミア & Undertale - Rated: M - English - Adventure - Chapters: 20 - Words: 70,753 - Reviews: 3 - Favs: 29 - Follows: 30 - Updated: 7/23/2023 - Published: 2/16/2023 - [OC, Momo Y.] [Tooru H., M. Ojiro]
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