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Harry Potter and Undertale Crossovers
159 Harry Potter and the Muggles Who Needed Magic » by TheZorker It's been over two years since Frisk fell to the Underground, and was adopted by the Dreemurr family. One of her former foster parents has finally noticed, and come looking for her. Now, if Frisk can't find a way to bring her families together... it might just tear her apart. Book Three of The Underground's Saviour
K+, English, Adventure, chapters: 14, words: 45k+, favs: 236, follows: 286, updated: 5/3 published: 9/15/2018
1k+ Under the Veil » by poplasia 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)
T, English, Fantasy & Humor, chapters: 57, words: 194k+, favs: 1k+, follows: 2k+, updated: 3/15 published: 8/1/2016, Sirius B., Sans
1 The Hogwarts History part 1 by Mmonpaw-shine This is my version of the Hogwarts History. And the chapters 1-3 crossover of Black Butler, Harry Potter, and Sans Au WARNING - I DON'T OWN ALL OF THE CHARACTERS JUST THE FAMILY MEMBERS NOT SALAZAR,HELGA,GODRIC, AND ROWENA AND THE ONE WHO TURN INTO OTHER CHARCTERS
K, English, words: 924, favs: 1, 2/10
61 The Trail We Blaze » by Count Victor The demon stands there, coated in dust, a knife in one hand and a familiar paper in the other. He watches as IT crosses half the room and tosses the paper onto the bar top, slowly he picks it up. -'S Tab. There's dust coating it.
T, English, Adventure & Hurt/Comfort, chapters: 14, words: 21k+, favs: 220, follows: 259, updated: 2/6 published: 3/18/2017, Harry P., Frisk, Sans, Grillby
16 Shattered and Broken, I Will Never Leave » by MistraltheSkelegirl 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!
T, English, Family, chapters: 3, words: 873, favs: 100, follows: 128, updated: 1/5 published: 2/10/2020, Harry P., Hedwig, Gaster
68 Dream Potter? Wait, WHAT! » by MistraltheSkelegirl 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.
T, English, Adventure & Family, chapters: 11, words: 12k+, favs: 197, follows: 217, updated: 1/5 published: 1/11/2020, Harry P., Albus D., Luna L., Sans
4 Sans, Papy and happy Frog » by Isys Luna Skeeter Harry wanted that for himself. A family. Someone. Anyone. And he found it. A skeletal one. - !Complete!
K+, English, Family & Friendship, chapters: 2, words: 2k+, favs: 44, follows: 32, updated: 12/7/2020 published: 2/13/2020, Harry P., Papyrus, Sans, Flowey
15 Harry Potter-Ex and the Goblet of Fire » by CreativeCollective 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
K, English, Drama & Adventure, chapters: 4, words: 4k+, favs: 85, follows: 101, updated: 11/17/2020 published: 10/12/2019, Harry P., Papyrus, Mettaton Ex
150 Ancient Magickes » by Flying Dragonite "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".
T, English, Hurt/Comfort & Angst, chapters: 24, words: 42k+, favs: 641, follows: 741, updated: 11/10/2020 published: 12/28/2016, Harry P., Papyrus, Sans, Chara
2 The Crypt Lord by bluerayfanfiction A mixture of lots of different stories/games. Including: Harry Potter, Undertale, Pokemon, The Hunger Games, Tensura, Minecraft, Henry Stickmin Collection, Godzilla, Doraemon, How to train your dragon (book movie), Jurassic World, Jurassic Park...
K+, English, Humor & Supernatural, words: 711, favs: 4, follows: 5, 11/4/2020
9 This is a test i might update it though » by SpinningRatt2003 This is a test- but... if I continue it... sans is stuck, collapsed in the judgment hall. He is slowly turning to dust... His bro- his little papy- has long since been dusted. If only he could do it again- if only he could fix this! (Undertale time travel, not resets.)
T, English, Humor & Hurt/Comfort, chapters: 2, words: 971, favs: 5, follows: 9, updated: 11/3/2020 published: 10/30/2020, George W., Death, Papyrus, Sans
10 Devoid Of LOVE » by Barc6117 Devoid of LOVE is a Crossover fic. After A genocide Route, Chara notices somethings, very offputting and decides, to escape the nightmare, and presses Reset, but... they end up in a different world altogether? Toby fox owns Undertale, J.K. Rowling owns Harry Potter. Contains Swears.
T, English, Friendship, chapters: 5, words: 1k+, favs: 3, follows: 6, updated: 9/25/2020 published: 7/12/2020, Harry P., Frisk, Chara
84 Fate Versus Determination » by EpicFail236 Why is it, I wonder sometimes, that it took this long for it to happen? Was it because of you? Was I supposed to help you? To teach you something? No, no I think it was you that was supposed to teach me something. Fortunately for both of us, you did. (Set post True Pacifist Ending, post Chamber of Secrets.) Many thanks to reviewers! Updates Sundays or Mondays
T, English, Adventure, chapters: 17, words: 63k+, favs: 222, follows: 274, updated: 8/16/2020 published: 6/29/2016, [Frisk, Monster Kid] Harry P., Asriel
17 Frisk's secret » by The Ninja's Shadows WBWL, Frisk is fem harry, summary inside. Frisk is still gender neutral oc's
K+, English, Mystery & Hurt/Comfort, chapters: 2, words: 2k+, favs: 66, follows: 72, updated: 4/28/2020 published: 3/25/2020
59 Harry Potter and the Magic of Souls » by Redemerald6 Two lonely children met at a young age. One went missing, leaving the other alone. But, the first soon returns to offer the other what they'd longed for ever since they were both little. A family who loves them.
T, English, Family & Fantasy, chapters: 12, words: 16k+, favs: 176, follows: 240, updated: 4/25/2020 published: 4/14/2018, Harry P., Frisk, Asriel, Chara
1 A Change Made By a True Slytherin: Miss Snow » by AssiehorseLadyfanfictionElla Rewrite of my A Change Part 1 story. Snow was a bit different to everyone else, but she sure does change Harry's path when he sits with her instead of Ron. However, secrets hide in her shadow, what are they? Does she even know them?
T, English, Adventure, chapters: 6, words: 25k+, favs: 10, follows: 16, updated: 3/6/2020 published: 12/3/2017, [Harry P., OC] Padma P., Frisk
13 A Different Story » by Freohr Weohnata Kausta Something happens to Chara Dreemurr after the Player hands over Frisks's SOUL. After meeting an unfamiliar face, they are thrust into a world where magic, to some, is an everyday occurrence and to others simply exists in fantasy. Not knowing what to do in a world without MONSTERS, they must survive and thrive throughout this new and different world.
T, English, Adventure & Fantasy, chapters: 4, words: 6k+, favs: 20, follows: 27, updated: 11/3/2019 published: 10/22/2019, Albus D., Chara
49 Who Would Have Known? » by WolfHowler1 Harry is on the run from the Ministry because he used underage magic. Bendy is just tired and misses his friend, Error. Error is tired of doing a thankless job which he hates doing, but if he doesn't do it everyone will die. Freddy and his friends are tired of doing things they don't want to do. What happens when all of them meet? (Fnaf and BatIM included)
T, English, Hurt/Comfort & Adventure, chapters: 8, words: 22k+, favs: 104, follows: 117, updated: 8/18/2019 published: 7/21/2017, Harry P., Sans
121 Harry Potter Down Under » by AsculaRiddle "Harry, please don't weep, all will be okay. stand, dust off the flowers and continue on your path..." A abused child in dire need of friends and family, but how can you help a child who doesn't believe he deserves it?
K+, English, Drama, chapters: 44, words: 37k+, favs: 206, follows: 234, updated: 5/29/2019 published: 3/7/2017
27 Papyrus and the Prisoner of Azkaban » by RiverSong456 Papyrus knows his lines. He plays his role perfectly. Now he's on a strange stage with no background to his character. Will he be able to convince everyone that he's the Boy-Who-Lived?
T, English, chapters: 10, words: 13k+, favs: 64, follows: 81, updated: 12/25/2018 published: 8/11/2018, Papyrus
2 Changes (title subject to change) by Viralwolf02 Frisk completes the Pacifist run with a choice. Have her memories wiped to restart her life, or save two souls. Fast forward to January 1976, Frisk and Chara get accepted into Hogwarts by the Headmaster personally. James Potter notices the quiet Slythern sisters and forgets Lily.
T, English, Friendship, words: 657, favs: 10, follows: 12, 11/16/2018, James P., Chara
2 Synecdouche » by Trainer Fiona Synecdoche- *A part is used for the whole or the whole is used for a part. *simultaneous understanding. AKA where I take soul shattering and the Master of Death thing WAY out of hand. ON HIATUS
K+, English, Hurt/Comfort & Adventure, chapters: 2, words: 737, favs: 21, follows: 26, updated: 11/11/2018 published: 6/4/2017, Harry P., Frisk, Chara
3 alphys vs the forces of evil » by xDark-QueeeenX when voldemort attacks the underground and kills napstablok, alphys and her sister become the only hope of the monsters
T, English, Adventure & Crime, chapters: 3, words: 748, updated: 11/9/2018 published: 11/3/2018, Alphys, OC, Frisk, Voldemort
310 Harry Potter and Endless Possibilities » by TheZorker After Frisk's first year at Hogwarts, things should be looking up for the Dreemurr family, as the awarding of the Order of Merlin suggests. But the next new students at Hogwarts may tip some very delicate scales... and in the Underground Kurt Kairos and Sans have a project of their own. Sequel to Harry Potter and the Underground's Saviour.
K+, English, chapters: 33, words: 109k+, favs: 381, follows: 340, updated: 9/28/2018 published: 4/23/2017
104 Maraudertale » by under-the-blue-moonlight After being missing for a month, Remus Lupin's twin sister returns with a brand new set of...interesting...friends. After spending the rest of the summer hiding his true identity from his new family, Remus and his friends find a new subject on their Hogwarts timetable for their fourth year and the professor is all too familiar to the young lycanthrope.
T, English, Fantasy & Friendship, chapters: 24, words: 29k+, favs: 114, follows: 145, updated: 7/2/2018 published: 10/10/2017, Remus L., James P., Frisk, Sans
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