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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: 68 - 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: 23 - Follows: 32 - 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: 4 - Favs: 4 - Follows: 3 - Published: 6/25 - Frisk, Ralsei, Susie - Complete
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: 17 - Words: 29,379 - Reviews: 16 - Favs: 9 - Follows: 8 - Updated: 6/24 - Published: 6/13/2021 - [Zane, Mettaton Ex] Alphys, Asgore D.
Firsk And The Ink Demon by Empv reviews
25 years after the pacifist route today was Firsk’s 25th birthday and Toriel was going to head to the grocery store but she never came back and Firsk was on her way to find her but what she stumble upon was a old wooden workshop that seemed abandoned for centuries...
Crossover - Undertale & Bendy and the Ink Machine - Rated: T - English - Romance/Drama - Chapters: 30 - Words: 7,202 - Reviews: 7 - Favs: 23 - Follows: 20 - Updated: 6/17 - Published: 5/28/2018 - Bendy, Frisk
Edd-Tale by Z.P.I
When Eddy's scam fails again, the Eds and another kid must work together to escape (or save) the underground. Will they survive? Will they make friends? Read and find out. Ed, Edd, n Eddy by Danny Antonucci. Undertale by Toby Fox
Crossover - Ed, Edd n Eddy & Undertale - Rated: T - English - Adventure/Friendship - Chapters: 1 - Words: 1,893 - Published: 6/12 - Eds, Frisk, Chara
Welcome to the Underground, you have never been here before by RealEdgeQuarter
Omori had been repeating the same adventure for two whole years now. Some people might think Omori would hate how repetitive it all was, but they would be wrong. Omori loved the repetitive nature of his life since it made his job so much easier. So that’s why Omori was annoyed by the fact he fell down a mountain filled with monsters instead of going on his usual adventure
Crossover - OMORI & Undertale - Rated: T - English - Adventure - Chapters: 1 - Words: 1,900 - Favs: 3 - Follows: 4 - Published: 6/7 - Chara, Flowey
When There's A Whip, There's A Way - (Outdated) by GreaterAxelord reviews
Richter's past few years were a living hell for him. So, when he got the chance to redeem himself by killing Shaft and Dracula for the second time, he gladly took it. Too bad a Belmont's life is an unlucky one. In the end, he found himself in a completely different world of monsters; one where they weren't constantly attacking him. Good for a dying man like himself, he guessed.
Crossover - Castlevania & Undertale - Rated: T - English - Chapters: 13 - Words: 75,576 - Reviews: 12 - Favs: 25 - Follows: 18 - Updated: 6/4 - Published: 10/7/2016 - Richter B., Frisk, Asriel, Toriel - Complete
Nightmare Chores (Nightmare Fredbear x Child reader by GlitterdragonTGPOU YT reviews
you were adopted by Nightmare Fredbear and his family. you were given chores that you have difficulty completing.
Crossover - Five Nights at Freddy´s & Undertale - Rated: K+ - English - Fantasy/Family - Chapters: 1 - Words: 1,286 - Reviews: 1 - Published: 6/3 - Nightmare, Fredbear - Complete
Overlord x undertale by FusingHorse9806 reviews
Año 2138,Hoy , el juego en linea que tanto alboroto ocasiono ,Yggdrasil,Pondrá silenciosamente fin a su servicio...Bueno se suponía que eso pasaría... Sin embargo el juego no se desconectó después de la hora final.Y un jugador asalariado fue arrastrado a ...¿Una cama de flores dorada en medio de las profundidades de una cueva? ¿Que ara el mago mas fuerte de todos en el subsuelo?
Crossover - Overlord/オーバーロード & Undertale - Rated: T - Spanish - Chapters: 1 - Words: 7,431 - Reviews: 5 - Favs: 9 - Follows: 10 - Published: 6/2 - Ainz, Sans, Toriel, Flowey
GodVirus by DarkTaleSans
Its an undertale au.
Crossover - Undertale & JoJo's Bizarre Adventure - Rated: T - English - Fantasy/Adventure - Chapters: 1 - Words: 136 - Published: 6/2
A Dimensional Scatter by SkyBenny10 reviews
Sonic and his friends are teleported into an unknown area, separated from each other. There, they meet an unknown tribe of people called "Monsters" who are trapped in this place. When the Monsters find what they are looking for, however, the morales between them and the Sonic gang clash for what's right and wrong. (Rated T for some instances of swearing.)
Crossover - Sonic the Hedgehog & Undertale - Rated: T - English - Adventure/Drama - Chapters: 3 - Words: 6,099 - Reviews: 13 - Favs: 17 - Follows: 23 - Updated: 5/31 - Published: 2/7/2020
Edwin-tale by Bakaforhire reviews
With no memory of how he got there, Frisk has to work together with another kid to survive(and maybe save) the underground. But how can they do that if they can't reset and the other kid is less smarter (and way stronger) than them? (Prequel to Doki Eddy Literature Club)
Crossover - Ed, Edd n Eddy & Undertale - Rated: T - English - Adventure - Chapters: 12 - Words: 50,276 - Reviews: 7 - Favs: 11 - Follows: 2 - Updated: 5/27 - Published: 1/7/2019
Principal Willoughby in Undertale 2 by callofdutyFTWnintendoFTL
Principal Willoughby has a grand adventure in the new game on the Intellivision Amico, Undertale 2, and fights a lot of evil villains in the universe of this game.
Crossover - Jimmy Neutron & Undertale - Rated: M - English - Adventure/Horror - Chapters: 1 - Words: 2,494 - Published: 5/22 - Principal Willoughby, Asriel - Complete
LOUDERTALE but my version… Genocide… by Loudcrowd111 reviews
A while ago to prove the legend was trueLincoln had accidentally fell into a mountain called Mount Ebott and met the monsters and made some friendsAfter completing the True Pacifist Undertale route, Lincoln had gotten curious, what if instead of Sparing everyone… he killed everyone? And this time… things will be slightly different than normal Undertale..,
Crossover - Loud House & Undertale - Rated: T - English - Tragedy/Drama - Chapters: 9 - Words: 46,702 - Reviews: 14 - Favs: 6 - Follows: 7 - Updated: 5/22 - Published: 3/16 - Lincoln L., Sans - Complete
Frisk's secret by Blacmage reviews
WBWL, Frisk is fem harry, summary inside. Frisk is still gender neutral oc's
Crossover - Harry Potter & Undertale - Rated: K+ - English - Mystery/Hurt/Comfort - Chapters: 4 - Words: 2,680 - Reviews: 22 - Favs: 86 - Follows: 88 - Updated: 5/22 - Published: 3/25/2020 - Complete
La Historia Del Protector Multidimensional Y La Princesa Carmeci by Renjicorrupt09
Hola a todos soy epic-sans y soy un escritor el cual renji:Hey sans ya terminaste la- en eso estoy tomate! ejem bueno solo dire que Disfruten el contenido
Crossover - High School DxD/ハイスクールD×D & Undertale - Rated: M - Spanish - Adventure/Supernatural - Chapters: 2 - Words: 2,591 - Favs: 1 - Follows: 1 - Published: 5/21 - [OC, H. Akeno, Rias G., Chara]
His Timeline by Alenshi
Kai Smith. In the Underground. Surrounded by monsters unlike anything he's ever seen before. All sorts of shenanigans ensue. This should be pretty self-explanatory, let's be real here.
Crossover - Ninjago & Undertale - Rated: M - English - Adventure/Drama - Chapters: 3 - Words: 4,460 - Favs: 1 - Follows: 1 - Published: 5/21 - Kai, Sans, Toriel, Flowey
Beastar Tales by Snivy the Hero reviews
4 years since Asriel was reborn and now he is a 16 year old, who is now being transferred to Cherryton Academy! Due to Asgore could do nothing about certain school systems, Asriel chose this way to finally to get a high school education. Something sinister goes down in the school and he is involved whether he likes it or not. Can he and his friends solve this crime in time?
Crossover - Undertale & Beastars/ビースターズ - Rated: M - English - Mystery/Adventure - Chapters: 4 - Words: 8,168 - Reviews: 1 - Favs: 9 - Follows: 11 - Updated: 5/21 - Published: 12/2/2021 - Asriel, Legosi, Haru, Juno
Frisk Potter (rewritten ver of frisk's sercets) by Blacmage reviews
summary inside fem!harry
Crossover - Harry Potter & Undertale - Rated: K - English - Family/Hurt/Comfort - Chapters: 1 - Words: 1,351 - Reviews: 4 - Favs: 34 - Follows: 40 - Published: 5/18
Oh Boy, what I have gotten myself into now? by BlackMoon3464 reviews
Harry James potter the master of death has seen many things. Through his many years of being alive, while trying to run away from death himself his responsibilities as master of death, but walking up as a skeleton and being in a house surrounded by other skeletons and while the only human in the house keeps harassing him.
Crossover - Harry Potter & Undertale - Rated: M - English - Fantasy/Romance - Chapters: 4 - Words: 9,215 - Reviews: 17 - Favs: 97 - Follows: 98 - Updated: 5/10 - Published: 5/4/2021 - Harry P., Papyrus, Sans
Wind and Fire by Redwood Sorrow reviews
The Avatar has the greatest power of all. Determination. The ability to persist through even the most trying of circumstances. But with the weight of the world on his shoulders, and an equally determined princess after him, will it be enough to restore balance?
Crossover - Avatar: Last Airbender & Undertale - Rated: T - English - Adventure/Drama - Chapters: 32 - Words: 183,838 - Reviews: 41 - Favs: 38 - Follows: 43 - Updated: 4/27 - Published: 4/7/2018 - [Aang, Azula] Katara, Frisk
Not a Nobody by Taliax reviews
The town called Hometown isn't Papyrus's home. But until he can find his way back to his universe, he'll cheer up the melancholy ghost who sounds like Mettaton. (Papyton AU where Undertale's Papyrus ends up stranded in the Deltarune universe.)
Crossover - Undertale & Deltarune - Rated: K+ - English - Romance/Hurt/Comfort - Chapters: 2 - Words: 8,939 - Reviews: 2 - Favs: 2 - Follows: 5 - Published: 4/23 - [Papyrus, Mettaton]
Welcome To The Underground by SwiftAuditore
Two people from our world were going about their business when they individually get kidnapped and they find themselves in the world of Undertale. While traveling undertale one of the two people manages to return to our world briefly and reunites with someone close to her but they get captured after putting up a fight and end up back in undertale.
Crossover - Undertale & JoJo's Bizarre Adventure - Rated: T - English - Adventure/Romance - Chapters: 7 - Words: 10,226 - Favs: 4 - Follows: 7 - Updated: 4/20 - Published: 2/18/2018 - [OC, Joseph J.] OC - Complete
Closed eyes by Blank-name26 reviews
"Where the fuck are we?" -A quote from Chara
Crossover - Young Justice & Undertale - Rated: M - English - Adventure - Chapters: 1 - Words: 5,627 - Reviews: 4 - Favs: 35 - Follows: 51 - Published: 4/10 - Frisk, Chara
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