Have you seen the anime Fullmetal Alchemist? Well, this is basically that but with Gravity Falls characters. Basically, all there is to understand is who matches up with who. There are three different versions. There will be two -s in between each one.
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Mabel and Dipper are basically both Edward, Grunkle Stan is Alphonse, Wendy and Soos are both Winry, Candy is Shou May, Toot-toot McBumbersnazzle(that's the only name I have sorry not sorry XD), Fiddleford is Marcho, Preston Northwest is King Bradley, the tattoo guy is Sloth, and Trigger are miscellaneous people in the military, Robbie is Ling/Greed, Tambry is Lan Fan, Pacifica is Olivier Mira Armstrong, Gideon is Pride, .GIFfany is Lust, Hohenheim is Ford.--
Dipper is Edward, Mabel is Alphonse, the rest is pretty much the same. This one isn't as big, so it's harder to find info on it.
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Stanley is Edward and Stanford is Alphonse. This one is also lesser known so again, less info.I used to have pictures for the last two but I can't find them...
Next AU: Gangster Falls
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Gravity Falls AUs
FanfictionDescriptions of all the Gravity Falls AUs I know of. None of the art or the AUs themselves belong to me unless stated. I created the cover photo using an app called LiveCollage and the background photo is just a background from Gravity Falls.