Gravity Falls
9 stories
Megatron, The Dimensional Tyrant by GamingLichdom
GamingLichdom
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Megatron was defeated in the final battle for Autobot City, abandoned in its ruins by his treacherous Second in Command. However, when death tried to claim him, the Decepticon Leader found himself alive and in a brand new world that reminded him too much of his old one - human insects infest the surface, much like a virus, along with his arch nemesis Optimus Prime. With no other option but to ransack the new Earth to produce Energon Cubes, Megatron begins rebuilding his empire, piece by piece, whilst searching for a means to return to his original dimension so that he may conquer the universe. This mission leads him on a strange path across infinite dimensions - worlds that he never believed existed. Follow the tyrant Megatron as he rushes through bizarre realities with the intent of returning home, all the while facing against alien warriors, overlords, and other strange beings who want nothing more than to see him fail. --------------------------------------- NOTE: This story is a mass-crossover fanfiction, with each world/crossover split into different arcs. Megatron will be a combination of the classic G1 show and a large inspiration of IDW comics.
That Axe Loving Readhead: A Gravity Falls Insert/ X Male Reader  by LRDiazz
LRDiazz
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    Parts 24
You just moved to Gravity Falls with your parents and decide to explore the town where you find the Mystery Shack. You than meet Wendy. You two talk and hit it off well. She also thinks you're kinda cute. Find out how your relationship grows in this story!
[ Reverse Falls ] Dipper x Mabel by Muta_La_Dumkop
Muta_La_Dumkop
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Reverse version of Dipper and Mabel. Both of them have feelings for each others
Dipper? (ADOPTED FROM MADTAD13) by tthill70
tthill70
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    Parts 28
Dipper has been gone for two weeks now and his family has been searching for him to no avail. But suddenly a mysterious demon going by the name Alcor shows up and claims he knows what happened to him. Is this too good to be true...? (First 2 chaps are not mine, are tweaked very, very slightly.)
Bill Cipher's Son by BlueCipher0
BlueCipher0
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    Parts 42
Bill wanted someone to care for and share his knowledge with, just between the two of them. But Bill never wanted a lover, being a demon was an advantage because they were a mix of both genders. Then when it's almost time for the baby to come, Stanford enters and banishes Bill into a deep place into the mindscape. After the banishment the container hatches and a baby boy is born, so Stanford gives the demon child to his relatives to care for along with their new born baby girl to be raised human. Dipper and Mable's first summer is almost about to end, but Dipper shines some black light over Bill's page and finds out he has a son. With the emotions of betrayal and distrust lingering on him how will he handle what's to come. Now that Bill's back he wants his Son no matter what! And Bill has a way of knowing where he is. Join them for a life of fun and conflict! Disclaimer: I DO NOT OWN GRAVITY FALLS!!! Or the pics and music :p P.s the is BoyxBoy relationships in here, leave now if you don't like Under cleaning at the moment
American Dad x Male Reader by readboy101
readboy101
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    Parts 6
Y/N L/N, a CIA agent is sent to Langley Falls under orders to keep an eye on the Smiths from his superior. He thought it would be a simple mission but as time goes on he finds himself surrounded by weirdness...and women. Just put this in now, but ain't mine. Only my cool bru, @Hotstreak Crossover stories.
Fight Falls AU {BOOK 1_BillDip Series} by Sweetiepie670
Sweetiepie670
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    Parts 34
Dipper and Mabel get into some trouble and are sent to Fight Falls for the summer. They will have to live with their Grunkle for the summer. There is a new guy in town called Kill Cipher and he has a murderous secret. Dipper can't seem to stay away from Kill since they have so much in common. They become best friends but friendship soon becomes more. Kill is afraid of one thing though. He is afraid dipper might find out who he really is and will Dipper still love him when he finds out? Evil also lurks around and tries to separate them. Read on! {I don't own Gravity Falls and the characters certainly don't belong to me! Reminder that this is an AU!} {COMPLETED}
Demon Dipper by Mable6893
Mable6893
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After being sucked into the portal Dipper becomes a demon...... after giving up Mabel lives her life like normal.... now see what happens when Mabel's daughter Trixie gets a demonic guardian.... who just so happens to be Mabels long lost brother.