I think Mabel would just use a celestial bronze version of her grappling hook and maybe a sword if she needs a backup weapon. (I don't think grappling hooks would be that effective anyway..."
Dipper would use a knife, why a knife? I dunno, it just seems to fit.
Pacifica would either use a knife or bow and arrows.
Bill would use... I have no idea actually.
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Demigod Twins AU
Hayran KurguBasically headcannons about the Mystery Twins (and others) as demigods. Gravity Falls (And characters) (c) Alex Hirsch Percy Jackson/Heroes of Olympus (And Characters) (c) Rick Riordan