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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: 51 - Words: 78,175 - Reviews: 25 - Favs: 110 - Follows: 108 - Updated: 3h - Published: 11/28/2020 - Luffy, Frisk
Hopes, Dreams, And DELTARUNE, Book 2: Cyber World by Dragonsrule18 reviews
Frisk and Susie are left reeling from their adventures in the Dark World, but there's no time to take a deep breath. As the Knight blows another fountain open, Frisk and Susie, along with little sister Tina, Berdly and Noelle, must seal it and stop an "evil" queen from taking over. And who is the man beckoning from Frisk's dreams, the one who speaks in hands?
Crossover - Undertale & Deltarune - Rated: T - English - Adventure/Friendship - Chapters: 9 - Words: 56,127 - Reviews: 31 - Favs: 11 - Follows: 10 - Updated: 3/5 - Published: 1/8 - Frisk, Noelle Holiday, Ralsei, Susie
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: 13 - Words: 79,755 - Reviews: 2 - Favs: 16 - Follows: 13 - Updated: 3/4 - Published: 2/8/2021 - [Yuya S., Frisk] [Yuzu H., Asriel]
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: 63 - Words: 217,448 - Reviews: 2100 - Favs: 2,117 - Follows: 2,433 - Updated: 3/2 - Published: 8/1/2016 - Sirius B., Sans
Harry Potter-Ex and the Goblet of Fire by CreativeCollective reviews
Harry Ex, adopted son of Mettaton and Papyrus, was happy. He loved his life since being taken from his abusive family. However, when he disappeared from the stage of one of his shows and appeared in the great hall at Hogwarts, he wasn't that surprised. Now he's got to do some dumb tournament? Fine. Harry has D.I.D No bashing of Weasleys or Hermione Includes UT AU's and ships
Crossover - Harry Potter & Undertale - Rated: K - English - Drama/Adventure - Chapters: 7 - Words: 10,961 - Reviews: 19 - Favs: 110 - Follows: 124 - Updated: 3/1 - Published: 10/12/2019 - Harry P., Papyrus, Mettaton Ex
Hogwarts Determination: The Chamber of Secrets by sparrow0sborne reviews
Frisk Dreemur is entering her second year when all of a sudden, fellow muggle borns are being petrified, and blood messages start appearing on the wall. As muggle born Slytherin, Frisk doesn't know if she is safe or not...
Crossover - Undertale & Harry Potter - Rated: K+ - English - Fantasy/Friendship - Chapters: 5 - Words: 17,636 - Reviews: 1 - Favs: 3 - Follows: 3 - Updated: 2/28 - Published: 2/23
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: 16 - Words: 116,158 - Reviews: 4 - Favs: 15 - Follows: 11 - Updated: 2/28 - Published: 9/11/2020 - Ryoga K./Shark, Rio K., OC, Frisk
LOUDERTALE but my version by Loudcrowd111 reviews
Lincoln discovers a legend about a mysterious mountain, he tried to prove to his sisters than the legend is true, but lincoln ends up falling into the underground, will Lincoln ever return?
Crossover - Loud House & Undertale - Rated: T - English - Adventure/Hurt/Comfort - Chapters: 31 - Words: 110,760 - Reviews: 30 - Favs: 31 - Follows: 36 - Updated: 2/28 - Published: 9/4/2021 - Lincoln L.
Underleague by sen whitefox mako red demon reviews
Here we are we made it. The Underleague, the most difficult challenge for any pokemon champion out there. 8 Gyms, 4 Elite members, 1 ultimate pokemon master. Their latest opponent? A...ten year old kid, without a license and and little eevee...Um is-is this normal? Oh, so your Frisk and you literally fell down here? Well in order to get out you have to go through the league. Sorry
Crossover - Undertale & Pokémon - Rated: T - English - Adventure/Family - Chapters: 43 - Words: 88,663 - Reviews: 51 - Favs: 101 - Follows: 110 - Updated: 2/28 - Published: 9/11/2016 - Frisk, Asriel, Papyrus, Sans
Winnie the Pooh's Undertale Adventure by TurboTasticKingCandy reviews
Pooh and his friends begin a whole new adventure, way down in the Underground... (Note: Story will take a Pacifist Route)
Crossover - Winnie the Pooh & Undertale - Rated: T - English - Adventure/Friendship - Chapters: 5 - Words: 10,795 - Reviews: 9 - Favs: 7 - Follows: 9 - Updated: 2/26 - Published: 4/27/2016 - Pooh, Frisk, Flowey
Hogwarts School of Magic and Monsters! by LeahLovesPotterUndertale reviews
A young girl named Arial discovers she is a halfling. Half witch, half skeleton. This is her story. There will be adventure, horror, and most of all, skeleton puns. Sans and Arial are sister and brother, and the first few chapters will be not that Undertale-y. I will try my best. This is my second fanfic. (other is still in progress also btw). My OC is in the place of Harry.
Crossover - Harry Potter & Undertale - Rated: T - English - Humor/Adventure - Chapters: 6 - Words: 4,065 - Reviews: 3 - Favs: 2 - Follows: 5 - Updated: 2/25 - Published: 1/21 - Hermione G., Dudley D., Sans, Flowey
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: CosmicPixel (Twitter)
Crossover - Undertale & Cuphead - Rated: K+ - English - Adventure/Fantasy - Chapters: 5 - Words: 37,660 - Reviews: 1 - Favs: 15 - Follows: 8 - Updated: 2/23 - Published: 7/16/2021 - Papyrus, Sans, Cuphead, Mugman
Hogwarts Determination: The Sorcerer's Stone by sparrow0sborne reviews
Frisk, Chara and Asriel were your typical human and monster children raised by monsters. Until they recieve a letter letting them know they have been accepted in Hogwarts School of Witchcraft and Wizardry!
Crossover - Undertale & Harry Potter - Rated: K+ - English - Fantasy/Friendship - Chapters: 15 - Words: 39,461 - Reviews: 1 - Favs: 4 - Follows: 7 - Updated: 2/23 - Published: 2/15 - Complete
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: 10 - Words: 21,771 - Reviews: 18 - Favs: 72 - Follows: 97 - Updated: 2/19 - Published: 5/7/2021 - [H. Issei, Ravel P.] Yubelluna, Orange Soul
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: 26 - Words: 94,041 - Reviews: 1 - Updated: 2/15 - Published: 2/7/2020
Shattered and Broken, I Will Never Leave by MistraltheSkelegirl reviews
Dr. W. D. Gaster has been in the Void for years, and has come to terms to the fact that he can't be seen or heard by anyone. But when one broken child can see him, he stays with them, and becomes the one to heal their broken Soul. FemHarry, Fatherly!Gaster, Manip!Dumbles. Please Review!
Crossover - Harry Potter & Undertale - Rated: T - English - Family - Chapters: 2 - Words: 780 - Reviews: 18 - Favs: 108 - Follows: 135 - Updated: 2/15 - Published: 2/10/2020 - Harry P., Hedwig, Gaster
Dream Potter? Wait, WHAT! by MistraltheSkelegirl reviews
Dream and Nightmare weren't actually related, though no one else knew that but them. So what happens when Dream's original world brings her back? Will they be ready to deal with her and all the crazy that decided to follow? Fem!Dream, Fem!Harry, BigBrother!Nightmare, and Multiships, including Cream and Insomnia. Now cross-posted on Wattpad.
Crossover - Harry Potter & Undertale - Rated: T - English - Adventure/Family - Chapters: 10 - Words: 12,539 - Reviews: 73 - Favs: 217 - Follows: 230 - Updated: 2/15 - Published: 1/11/2020 - Harry P., Albus D., Luna L., Sans
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: 11 - Words: 23,460 - Reviews: 12 - Favs: 7 - Follows: 6 - Updated: 2/10 - Published: 6/13/2021 - [Zane, Mettaton Ex] Alphys, Asgore D.
Genietale by Dream Dragoness reviews
Centuries ago, the people of Ebbot Island fought a terrible war with monsters, sealing them under Mount Ebbot and earning the ire of Sequin Land. Frisk, a young half-genie, received visions about the war and a feeling telling her to go to the mountain, only for her to fall into the monster kingdom. Now, Frisk must travel the Underground, harness her magic, and find a way home.
Crossover - Shantae & Undertale - Rated: T - English - Adventure/Fantasy - Chapters: 3 - Words: 14,541 - Reviews: 5 - Favs: 5 - Follows: 4 - Updated: 2/8 - Published: 5/9/2021 - OC, Shantae, Frisk, Flowey
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: 13 - Words: 96,034 - Reviews: 108 - Favs: 271 - Follows: 315 - Updated: 2/8 - Published: 5/25/2020 - Naruto U., Frisk
Deathbattle! Undertale vs Xenoblade Chronicles! by CrumpsCrumbs
Soul vs Heart! Magic vs Ether! Monsters vs Homs! It's time for a collection of Deathbattles between Undertale and Xenoblade Chronicles!
Crossover - Xenoblade Chronicles & Undertale - Rated: K+ - English - Friendship - Chapters: 6 - Words: 13,522 - Favs: 1 - Updated: 2/4 - Published: 1/28 - [Reyn, Papyrus] [Shulk, Sans] - Complete
The Storm of Eyes by TheOriginalWriterGuy reviews
/\A Two Kinds x Undertale Crossover/\ On the journey to the Basitin Isles, Trace's voyage is intercepted by a mysterious storm, which was not predicted by Captain Eric's navigator. Hesistant to stray too far off-course, they decide to brave the storm- only to find themselves seeing into another universe. There, they traverse into a world entirely hostile to them...
Crossover - Two Kinds & Undertale - Rated: T - English - Mystery/Adventure - Chapters: 22 - Words: 34,178 - Reviews: 23 - Favs: 9 - Follows: 9 - Updated: 2/3 - Published: 4/15/2021
Nostalgia Critic Eats Asriel by callofdutyFTWnintendoFTL reviews
The Nostalgia Critic is hungry and really wants to devour something, or someone, who will fill his stomach full.
Crossover - Jimmy Neutron & Undertale - Rated: M - English - Friendship/Suspense - Chapters: 1 - Words: 441 - Reviews: 1 - Published: 1/26 - Principal Willoughby, Asriel - Complete
Children of Darkness (Soul of Void) by LuAO0 reviews
For ages, the Void godness has to sit and see how her multiverse was fill and filled by AUs of her Universe, Undertale, she hated them at first, but now all her hate fall in their creator, Fate's spawn, Ink. Meanwhile, in another Multiverse, other Void God makes a deal with the ruler of Hallownest.
Crossover - Undertale & Hollow Knight - Rated: T - English - Hurt/Comfort/Family - Chapters: 12 - Words: 25,129 - Reviews: 8 - Favs: 37 - Follows: 44 - Updated: 1/26 - Published: 1/31/2021 - Sans, The Hollow Knight, the Knight
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: 4 - Words: 7,505 - Reviews: 1 - Favs: 1 - Follows: 2 - Updated: 1/25 - Published: 1/16 - Frisk, OC, Sans, Chara
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