Crossovers
3 stories
GravityTale by ANinnyMouse42
ANinnyMouse42
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    Parts 5
Last summer, Mabel and Dipper Pines vanquished the demon known as Bill Cipher. This summer, they're looking forward to a vacation in their favorite place on earth: Gravity Falls. Meanwhile, Sans is relatively happy. This is the first timeline in which the kid has gone completely pacifist, not gained even one EXP. Of course, he knows they'll likely reset in the end, but hey, he might as well enjoy the peace while it lasts, right? But when a shortcut goes awry and he and Frisk end up in a strange forest on the surface, things take a turn for the worse, and even with their new friends, it doesn't look like they're in for a good time. But hey, this is Gravity Falls! Weird things happen here, all you need is just a little bit of determination... (This is a SIDE PROJECT. Updates are sporadic and may be infrequent!)
Under the Veil by Poplasia
Poplasia
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    Parts 76
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.
A tale of Mages and Monsters (cancelled) by Elementisphere
Elementisphere
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    Parts 26
The barrier has been broken. Not due to SOULs, but due to a successful experiment by Doctor Gaster. Now, monsters must assimilate into the human world, where, apparently, the mages are in hiding. Hogwarts school is always a safe place from outside politics, but how will it adapt with literal monsters in its walls? Featuring Sans as the main character! (Multiple POVs at certain points, and maybe a few chapters with a different main character?)