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Ruby Red Eyes by DazMaZ reviews
The war of Heroes and Villians rages on, but what happens when DETERMINATION appears in their world?
Crossover - My Hero Academia/僕のヒーローアカデミア & Undertale - Rated: T - English - Adventure/Friendship - Chapters: 8 - Words: 50,953 - Reviews: 130 - Favs: 395 - Follows: 509 - Updated: 10/10 - Published: 8/28/2020 - Katsuki B., Frisk, Chara
A light in the void by Autumn Galactica reviews
Summer and Autumn were very close because both of them are twins... Years passed by, Summer was sent on a mission and didn't came back, Autumn Rose who came from a far location had gone back to Vale to meet her family and lastly her twin, a shocking news that will break Autumn's heart will change her forever however she won't stop until she sees her whether dead or alive
Crossover - RWBY & Undertale - Rated: K - English - Hurt/Comfort/Adventure - Chapters: 4 - Words: 1,365 - Reviews: 2 - Favs: 5 - Follows: 5 - Published: 10/10 - Team RWBY, Team STRQ, OC, Sans
UnderDxDTale by Jack No in Heaven reviews
(Crossover con Undertale) (Male Frisk). Después de Lograr salvar a todos Y crecer juntos, Frisk disfruta de una vida tranquila hasta el momento que lo manda lejos de todo lo que conoce. Ahora lejos en un lugar que apenas conoce, esta seguro de algo... Esta lleno de Determinación. Una que hara cambiar el mundo.
Crossover - High School DxD/ハイスクールD×D & Undertale - Rated: M - Spanish - Adventure/Romance - Chapters: 5 - Words: 26,118 - Reviews: 40 - Favs: 48 - Follows: 51 - Updated: 10/10 - Published: 3/13/2017 - Frisk
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: 3 - Words: 4,146 - Reviews: 6 - Favs: 38 - Follows: 50 - Updated: 10/10 - Published: 5/18
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: 33 - Words: 191,290 - Reviews: 41 - Favs: 39 - Follows: 44 - Updated: 10/9 - Published: 4/7/2018 - [Aang, Azula] Katara, Frisk
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: 7 - Words: 26,768 - Reviews: 72 - Favs: 220 - Follows: 243 - Updated: 10/9 - Published: 3/18 - Jaune A., Undyne, Toriel, Asgore D.
Socrates in the caves by HushBugger reviews
What if Socrates fell into the underground?
Crossover - Misc. Books & Undertale - Rated: K - English - Chapters: 5 - Words: 2,855 - Reviews: 7 - Favs: 10 - Follows: 10 - Updated: 10/8 - Published: 8/14/2017 - Papyrus, Undyne, Toriel, Mettaton
Batmantale by AlithiaSigma reviews
Batman finds himself in the Underground with nothing but his clothes and the drive to continue on. Really, it's Batman in Undertale. And Batman does have one power. He never gives up.
Crossover - Batman & Undertale - Rated: T - English - Chapters: 9 - Words: 16,801 - Reviews: 117 - Favs: 133 - Follows: 195 - Updated: 10/6 - Published: 2/21/2016 - Bruce W./Batman, Sans
LoudTale by Scourge7
What happens when three kids fall into Mt. Ebott? What will they do? How will they survive? And most importantly, how will their choices affect everything? Find out in this tale...LoudTale
Crossover - Undertale & Loud House - Rated: T - English - Adventure/Humor - Chapters: 1 - Words: 4,212 - Favs: 4 - Follows: 5 - Published: 10/6
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: 21 - Words: 33,644 - Reviews: 16 - Favs: 11 - Follows: 10 - Updated: 10/5 - Published: 6/13/2021 - [Zane, Mettaton Ex] Alphys, Asgore D. - Complete
Ancient Magickes by Flying Dragonite reviews
"Legend has it, an 'angel' who has seen the surface will descend from above and bring us freedom." Upon Harry Potter's 16th birthday, he finds himself receiving a creature inheritance of such monumental importance, that he may be the key to peace between monsters and humans, purebloods and muggleborns, wizards and muggles. And he had always said he simply wanted to be "just Harry".
Crossover - Harry Potter & Undertale - Rated: T - English - Hurt/Comfort/Angst - Chapters: 25 - Words: 42,207 - Reviews: 159 - Favs: 720 - Follows: 811 - Updated: 10/3 - Published: 12/28/2016 - Harry P., Papyrus, Sans, Chara
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: 66 - Words: 229,162 - Reviews: 2161 - Favs: 2,278 - Follows: 2,581 - Updated: 9/30 - Published: 8/1/2016 - Sirius B., Sans
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: 32 - Words: 58,866 - Favs: 1 - Follows: 1 - Updated: 9/30 - Published: 3/30/2021 - [Alphys, Sans, Undyne] Frisk
Titantale by Kaiju Enjoyer reviews
Frisk has freed the monsters from the underground, and a new era is about to begin. But the monsters are about to return to a world very different from the one they left when they were imprisoned. A world that has changed the moment humans learned a thing that the monsters will learn too: that this world always belonged to Godzilla, and that humans and monsters just lived in it.
Crossover - Godzilla & Undertale - Rated: T - English - Adventure/Fantasy - Chapters: 2 - Words: 3,797 - Reviews: 4 - Favs: 11 - Follows: 10 - Updated: 9/27 - Published: 9/16
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: 12 - Words: 12,049 - Reviews: 2 - Updated: 9/25 - Published: 7/5 - Sans
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: 8 - Words: 57,526 - Reviews: 4 - Favs: 25 - Follows: 21 - Updated: 9/23 - Published: 7/16/2021 - Papyrus, Sans, Cuphead, Mugman
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: 13 - Words: 26,847 - Reviews: 20 - Favs: 98 - Follows: 124 - Updated: 9/22 - Published: 5/7/2021 - [H. Issei, Ravel P.] Yubelluna, Orange Soul
DoubleTale: When Devils Cry by lmao-imdeadaf reviews
21 iterations of W.D Gaster each brought a child with unlimited potential through from our world to theirs. These are the ones we know of. Somewhere, not too far from The Angel's own 'verse, another child is brought in, along with a few other…things. (Or, I'm a nerd so I inserted myself into a DT fic with DMC crap.) / ON HIATUS DUE TO PERSONAL SHIT - WILL CONTINUE AS SOON AS ABLE
Crossover - Undertale & Devil May Cry - Rated: T - English - Humor/Fantasy - Chapters: 5 - Words: 8,670 - Reviews: 1 - Favs: 2 - Follows: 3 - Updated: 9/20 - Published: 1/16 - Frisk, OC, Sans, Chara
Digitale by Razorwolfie
A crossover fanfiction of Digimon and Undertale, I have been thinking about this for a long time, so I decided to make this fanfic. This also happens to be my first fanfic so it's probably not that good, but I hope you enjoy it regarless.
Crossover - Digimon & Undertale - Rated: T - English - Adventure/Fantasy - Chapters: 1 - Words: 9,824 - Published: 9/3 - [Lunamon, Shoutmon] Toriel, Flowey
Corpse And Decay by Anime0CC0Manga
The Minus Among Minuses And The Cute Loveless Has Taken Quite The Fall Underground (I Own Nothing)
Crossover - Medaka Box/めだかボックス & Undertale - Rated: K - English - Adventure/Fantasy - Chapters: 1 - Words: 1,124 - Favs: 6 - Follows: 5 - Published: 9/2 - M. Kumagawa, Mukae E., Papyrus, Sans
Sonic in Undertale by Archaeopteryx108
(This is a work in progress. I own nothing. Sonic is owned by SEGA, and Undertale is a product of Toby Fox.) When a blue hedgehog that can go faster than the speed of sound and a small child fall into a mountain… they will find something quite unexpected… This is a version of the Pacifist Route with Sonic in it. I will upload infrequently. Review if you enjoy!
Crossover - Sonic the Hedgehog & Undertale - Rated: K+ - English - Adventure/Friendship - Chapters: 4 - Words: 3,605 - Favs: 5 - Follows: 5 - Updated: 9/1 - Published: 6/17 - Sonic, Frisk, Chara
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: 2 - Words: 1,816 - Favs: 1 - Follows: 1 - Updated: 8/30 - Published: 7/3 - OC, Toriel
The Evil of Principal Willaby by callofdutyFTWnintendoFTL
The horror of Principal Willaby is truly horrifying.
Crossover - Jimmy Neutron & Undertale - Rated: M - English - Horror/Angst - Chapters: 1 - Words: 1,058 - Published: 8/28 - Principal Willoughby, Asriel, Toriel, Asgore D. - Complete
Sinstale by Pikachu the critic
Taking under a nickname, you explore the underground where the demons were sealed. Will you make peace with them or make them face true wrath? The choice is yours.
Crossover - Seven Deadly Sins/七つの大罪 & Undertale - Rated: T - English - Adventure/Supernatural - Chapters: 2 - Words: 2,349 - Updated: 8/28 - Published: 8/24
Worlds above the Underground (Rewrite) by bopdog111 reviews
(Rewrite of Ulrich's idea) Frisk Dreemurr did the impossible and freed the monsters from their prison under Mt. Ebott. She saved all of monster kind and even went the extra mile to try and bring back Chara and Asriel and succeeded. Now on the Surface the three Dreemurr children have a new goal, becoming three great Entertainment Duelists. Co-Write with Ulrich362
Crossover - Yu-Gi-Oh! Arc-V & Undertale - Rated: T - English - Suspense/Adventure - Chapters: 17 - Words: 104,575 - Reviews: 2 - Favs: 20 - Follows: 20 - Updated: 8/16 - Published: 2/8/2021 - [Yuya S., Frisk] [Yuzu H., Asriel]
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