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A life-long story by bonan4398 reviews
A simple question arose one day. What happens if some fandoms and their events take place in the same universe, on the same planet and in the same world, while somehow intersecting with each other? Now with this answer I want to share with you. It all started with a kind fairy tale, telling about friendship and kindness, and a family where there is a child who owns a power...
Crossover - Five Nights at Freddy´s & Undertale - Rated: T - English - Friendship/Family - Chapters: 22 - Words: 57,860 - Reviews: 2 - Favs: 4 - Follows: 3 - Updated: 12h - Published: 7/6 - The Murderer/William Afton, Big Brother, The One You Should Not Have Killed, Elizabeth Afton
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 - Published: 8/30 - Frisk, Sans - Complete
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: 3 - Words: 2,644 - Reviews: 15 - Favs: 11 - Follows: 19 - Updated: 8/30 - Published: 8/26 - [Izuku M., Chara]
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: 15 - Favs: 8 - Follows: 7 - Updated: 8/27 - Published: 8/18
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: 75 - Words: 118,804 - Reviews: 68 - Favs: 239 - Follows: 242 - Updated: 8/26 - Published: 11/28/2020 - Luffy, Frisk
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: 69 - Words: 244,703 - Reviews: 2220 - Favs: 2,391 - Follows: 2,699 - Updated: 8/26 - Published: 8/1/2016 - Sirius B., 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: 35 - Words: 128,653 - Reviews: 1 - Updated: 8/26 - Published: 2/7/2020
The Duelist of Mt Ebott (Remastered) by bopdog111
Remake of my first SOUL Monsters installment! 2 years after releasing Mt. Ebott from the barrier, Frisk wins a contest hosted by Kaiba Corp. to gain tuition at Duel Academy. What awaits her are new friends, new rivals, and perhaps even some love while dealing with two shadowy groups known as the Shadow Riders, and Gastly Shadows for the Sacred Beasts. FemFrisk. FriskxChazz
Crossover - Yu-Gi-Oh GX & Undertale - Rated: T - English - Supernatural/Adventure - Chapters: 6 - Words: 38,869 - Favs: 6 - Follows: 7 - Updated: 8/25 - Published: 7/20 - [Chazz P./Manjōme J., Frisk] Jaden Y./Jūdai Y., Undyne
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: 11 - Words: 39,371 - Reviews: 98 - Favs: 288 - Follows: 346 - Updated: 8/23 - Published: 3/18/2022 - Jaune A., Undyne, Toriel, Asgore D.
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: 1 - Favs: 1 - Follows: 3 - Updated: 8/22 - Published: 7/28
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
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 - Published: 8/15
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: 23 - Words: 178,388 - Reviews: 208 - Favs: 404 - Follows: 455 - Updated: 8/15 - Published: 5/25/2020 - Naruto U., 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.
Crossover - Touhou Project & Undertale - Rated: T - English - Adventure/Mystery - Chapters: 5 - Words: 18,216 - Reviews: 1 - Favs: 5 - Follows: 7 - Updated: 8/13 - Published: 7/3
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 - Published: 7/4
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: 4 - Words: 18,461 - Reviews: 3 - Updated: 8/10 - Published: 7/10 - [Asgore D., Gaster] Toriel, Kris Dreemurr
WindWalker Determination by TwilightDawnRider reviews
Compa and Iffy were discovering a new mountain called mount Ebbot but they wind up falling into the cavern where the monsters reside. Would they have to fight to get free, or are these monsters not like the ones in Gamindustri? Will the folks in Gamindustri try to save them? Is there a dark secret in these Caverns? Will the two girls know what to do when the time comes?
Crossover - Hyperdimension Neptunia & Undertale - Rated: T - English - Humor/Friendship - Chapters: 8 - Words: 27,795 - Reviews: 1 - Favs: 8 - Follows: 13 - Updated: 8/10 - Published: 12/4/2022 - Compa, IF, Frisk, Sans
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: 22 - Favs: 22 - Follows: 25 - Updated: 8/8 - 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 (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: 47,867 - Reviews: 45 - Favs: 146 - Follows: 178 - Updated: 8/7 - Published: 3/7 - Toriel, Rifana, Raphtalia
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: 10 - Words: 50,135 - Reviews: 2 - Favs: 11 - Follows: 10 - Updated: 8/3 - Published: 6/30/2022 - Dragonborn/Dovahkiin, Delphine, Frisk, Chara
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: 5 - Favs: 9 - Follows: 17 - Updated: 8/3 - Published: 6/10
The Destination Follows the Journey by Shippo704
They just wanted to be themselves. Their parents didn't listen. They didn't understand. When their parents wanted to send them to a conversion camp, they decided it was time to run away. After an incident in the nearest national park, they find themselves in world of monsters and magic. Then, along their journey, they make friends and find themselves too.
Crossover - Undertale & Wayward Children series - Rated: T - English - Adventure/Hurt/Comfort - Chapters: 28 - Words: 122,657 - Updated: 8/1 - Published: 10/5/2022 - Frisk, Sans, Toriel, Mettaton
UnderDust - Volume 1 by Triple B Studios reviews
Frisk awakens from his slumber, with no memory of his past, except for his name. He befriends a kind, honest girl name Ruby Rose. Under the care and supervision of Glynda Goodwitch, he soon became the first child to intend Beacon with Ruby. Follow Frisk as he make new friends, go on adventures, all the while being filled with determination!
Crossover - RWBY & Undertale - Rated: T - English - Adventure/Fantasy - Chapters: 2 - Words: 5,466 - Reviews: 4 - Favs: 13 - Follows: 14 - Updated: 7/31 - Published: 7/28 - Frisk
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: 25 - Words: 106,855 - Reviews: 160 - Favs: 225 - Follows: 277 - Updated: 7/25 - Published: 2/21/2018
(Not) Quirk Of Judgement by maken.bialy2 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: 2 - Favs: 24 - Follows: 24 - Updated: 7/23 - Published: 2/16 - [OC, Momo Y.] [Tooru H., M. Ojiro]
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