Headcannon where Dipper didn't really exist in the first place; he was made up by Mabel in an effort to cease her loneliness. Eventually, Bill came along and decided to make a deal with Mabel when she was five or four?? Anyway, she ended up with a real brother (Dipper) and Bill walked away with Mabel's zodiac secured for the apocalypse. That's why Bill picks on Dipper the most.
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Gravity Falls in a Nutshell
FanficHeadcannons and shitposts. Mostly canon. Please don't start a shipping war, I don't need that on my conscience. Updates daily-ish