Basically, Bill Cipher (triangle) and Tad Strange (square) have been assigned to be the guardians of Dipper and Mabel Pines. Tad is very kind and mom-like to Mabel,
while Bill is very cruel and annoying to Dipper.
That's pretty much it. It's interesting seeing them interact with one another, and I absolutely love the idea of Bill being forced to (kind of) care for Dipper.
This AU belongs to StarFleetRambo on tumblr. I'd also like to mention there's some fanart for other characters' guardians too.
The next AU I'll cover is Fullmetal Falls/Alchemy 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.