Undertale Crossovers
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We're Screwed by boredgrace23
Asgore finds an old, incomplete painting he did of a man playing the piano.
Crossover - Undertale & Deltarune - Rated: T - English - Angst/Romance - Chapters: 3 - Words: 11,720 - Updated: 2h - Published: 7/10 - [Asgore D., Gaster] Toriel, Kris Dreemurr
A life-long story by bonan4398
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: 5 - Words: 14,514 - Favs: 1 - Follows: 1 - Updated: 20h - Published: 7/6 - The Murderer/William Afton, Big Brother, The One You Should Not Have Killed, Elizabeth Afton
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. (Cover by ArtBichon on Twitter)
Crossover - Undertale & Hazbin Hotel - Rated: M - English - Adventure - Chapters: 6 - Words: 18,660 - Reviews: 51 - Favs: 133 - Follows: 178 - Updated: 7/14 - Published: 5/7/2022 - Sans, Alastor, Charlie, Blitzo
Anomaly Between Worlds I by Danny RPG NineTwoOak
In a nutshell, a younger fictionalized version of myself got stuck in "Food Fantasy" as a dragon during the shit pandemic and has been forced to adapt to that reality ever since. That's it; that's the whole thing.
Crossover - Undertale & Food Fantasy - Rated: T - English - Parody/Adventure - Chapters: 2 - Words: 7,508 - Published: 7/13
Antebellum by Novice Lowland
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: 3 - Words: 9,272 - Favs: 3 - Follows: 5 - Updated: 7/11 - Published: 7/3
Closed eyes by Blank-name26 reviews
"Where the fuck are we?" -A quote from Chara
Crossover - Young Justice & Undertale - Rated: M - English - Adventure - Chapters: 2 - Words: 11,458 - Reviews: 12 - Favs: 55 - Follows: 68 - Updated: 7/10 - Published: 4/10/2022 - Frisk, Chara
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? Spoilers for Undertale and Fnaf Security Breach
Crossover - Five Nights at Freddy´s & Undertale - Rated: T - English - Horror/Family - Chapters: 24 - Words: 33,193 - Reviews: 25 - Favs: 34 - Follows: 40 - Updated: 7/10 - Published: 5/19/2022 - Vanny/Reluctant Follower, Gregory, Frisk, Sans
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: 73 - Words: 114,881 - Reviews: 62 - Favs: 235 - Follows: 236 - Updated: 7/10 - Published: 11/28/2020 - Luffy, Frisk
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: 25 - Words: 108,231 - Updated: 7/9 - Published: 10/5/2022 - Frisk, Sans, Toriel, Mettaton
(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: 19 - Words: 67,443 - Reviews: 2 - Favs: 22 - Follows: 24 - Updated: 7/8 - Published: 2/16 - [OC, Momo Y.] [Tooru H., M. Ojiro]
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: 1 - Words: 2,452 - Published: 7/4
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: 22 - Words: 169,818 - Reviews: 201 - Favs: 390 - Follows: 440 - Updated: 7/3 - Published: 5/25/2020 - Naruto U., 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 me.
Crossover - Undertale & Cuphead - Rated: K+ - English - Adventure/Fantasy - Chapters: 9 - Words: 65,435 - Reviews: 5 - Favs: 26 - Follows: 22 - Updated: 6/30 - Published: 7/16/2021 - Papyrus, Sans, Cuphead, Mugman
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: 44 - Words: 88,483 - Reviews: 21 - Favs: 53 - Follows: 57 - Updated: 6/28 - Published: 4/18/2017 - Maxwell/William C., Wilson H., Frisk, Chara
YellowTale by YellowCaballeroFan reviews
Ever since Toby Fox made the RPG game know as Undertale 5 years ago, many people made their own versions of it, known as AUs, or Alternate Universes. Here is my AU, which stars a most likely forgotten character from the Pokemon Adventures Manga: Yellow. This is also kind of takes place after a whole bunch of stories that expand on Yellow's character. Hope you enjoy!
Crossover - Pokémon & Undertale - Rated: T - English - Adventure/Friendship - Chapters: 32 - Words: 26,103 - Reviews: 6 - Favs: 10 - Follows: 11 - Updated: 6/26 - Published: 11/9/2020 - Yellow, Pikachu
Golden Flowers Fill My Dreams by Endralis reviews
Ruby Rose recognized that person in the tree. They certainly stood out with their disheveled hair, tattered yellow and green shirt and sharp red eyes; yet she couldn't place where she had seen them before. They also had a strange name, and coming from a family with names like theirs that was saying something. Really, who names their child Chara? What kind of color is that?
Crossover - RWBY & Undertale - Rated: T - English - Mystery/Friendship - Chapters: 6 - Words: 31,324 - Reviews: 9 - Favs: 32 - Follows: 39 - Updated: 6/25 - Published: 10/8/2022 - Ruby R., Yang X.L., Chara, Flowey
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: 6 - Words: 20,173 - Reviews: 2 - Favs: 8 - Follows: 13 - Updated: 6/23 - Published: 12/4/2022 - Compa, IF, Frisk, Sans
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: 18 - Words: 19,182 - Reviews: 20 - Favs: 62 - Follows: 69 - Updated: 6/22 - Published: 7/9/2017
A Blazing A Blue Eye by ZCL9822 reviews
I don't own Undertale or MHA. They are owned by Toby Fox and Kohei Horikoshi respectively. I'm rather garbage at summaries and descriptions, so I guess you'll have to read to find out.
Crossover - My Hero Academia/僕のヒーローアカデミア & Undertale - Rated: T - English - Crime/Humor - Chapters: 3 - Words: 2,218 - Reviews: 2 - Favs: 12 - Follows: 15 - Updated: 6/21 - Published: 6/15
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: 14 - Words: 28,507 - Reviews: 21 - Favs: 138 - Follows: 168 - Updated: 6/21 - Published: 5/7/2021 - [H. Issei, Ravel P.] Yubelluna, Orange Soul
Mario Eats Asriel's Boogers by callofdutyFTWnintendoFTL
Mario eats Asriel's boogers from his nostrils inside his nose. Mario loves to eat Asriel's mucus very much! Bing bing wahoo!
Crossover - Mario & Undertale - Rated: M - English - Humor/Parody - Chapters: 1 - Words: 615 - Published: 6/21 - Mario, Asriel - Complete
Principal Willaby Kills Miss Fowl by callofdutyFTWnintendoFTL
Principal Willaby is very tired of Miss Fowl being a Channel Awesome fan, and he must do something about it!
Crossover - Jimmy Neutron & Undertale - Rated: M - English - Supernatural/Fantasy - Chapters: 1 - Words: 1,162 - Published: 6/15 - Ms. Fowl, Principal Willoughby, Asriel, Asgore D. - Complete
Rising of the Motherly Shield by Pezil 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: 9 - Words: 30,828 - Reviews: 39 - Favs: 121 - Follows: 149 - Updated: 6/15 - Published: 3/7 - Toriel, Rifana, Raphtalia
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: 68 - Words: 240,510 - Reviews: 2205 - Favs: 2,368 - Follows: 2,675 - Updated: 6/12 - Published: 8/1/2016 - Sirius B., Sans
Pokétales by Moonwatcher425
Frisk used the reset button, but it glitched and instead of resting like normal. Everything reset to a new and different world. Sans, Papyrus, and the other Monsters were brought along too. Frisk was not sure what was going on at first but she soon figures out where they were.
Crossover - Pokémon & Undertale - Rated: T - English - Adventure/Mystery - Chapters: 3 - Words: 5,091 - Favs: 3 - Follows: 2 - Published: 6/12 - [Ash K./Satoshi, Serena] [Sans, OC]
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