Okay, so I was looking for exactly this kind of thing a while back, and honestly, it’s less common than you’d think considering the source material is already paranormal. Most of the big supernatural crossovers lean into ‘Supernatural’ the TV show, which… fits, but feels a bit obvious sometimes. There’s a decent one called ‘Hunters of the Falls’ where Sam and Dean roll into Gravity Falls after a case leads them there, and Bill immediately pegs them as interesting new toys. The dynamic of the Winchesters trying to deal with a threat they can’t just salt and burn is pretty fun.
What really stood out to me, though, was a much weirder, older fic that crossed over with ‘The Magnus Archives’. It was called something like ‘Ceaseless Watcher in the Pine Trees’. The concept was that the Fear entities were bleeding into Gravity Falls through the weirdness magnetism of the town, and Bill was basically trying to broker alliances or manipulate them. It was super atmospheric and creepy in a different way than usual Bill chaos. It hasn’t been updated in years, but the vibes were immaculate.
Most of the good supernatural crossovers I’ve found are from authors who are deep into multiple fandoms. They’ll write Billdip into a ‘Hellboy’ universe or have Dipper summon something from ‘The Old Gods of Appalachia’ podcasts. The appeal isn’t just the romance; it’s watching how Bill’s brand of reality-warping chaos bounces off other established mythologies. The tone shifts completely depending on the crossover—it can go from apocalyptic horror to weird comedy. You have to search by the crossover tag rather than just the ship tag to find the really niche ones.
I actually got bored of the pure Gravity Falls fics a few years back and went digging for crossovers specifically to see how Bill would interact with other cosmic horrors. The ‘Welcome to Night Vale’ crossover scene had a moment. There was this fic where Cecil’s broadcast started reporting on weird triangular activity in a forest town, and it escalated into a sort of psychic war between Bill and the Smiling God. It was less about a romantic ship and more about two incomprehensible forces acknowledging each other. The writing was very stylistic, mimicking the podcast’s prose.
Another one tossed Bill into the world of ‘The Sandman’. He tried to make a deal with Dream, which went about as well as you’d expect. It was a short story, but the idea of Bill being put in his place by an even older, more powerful entity was deeply satisfying. Those fics are harder to find because they’re not tagged as Billdip per se, but more as general crossovers where the pairing happens incidentally.
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Gravity Falls fanfiction is such a treasure trove of creativity, and Dipper and Mabel are the heart of so many amazing stories. One standout is 'Twisted Pines'—a sprawling AU where the twins return to Gravity Falls years later, only to find the town eerily different. The author nails their sibling dynamic, blending humor and mystery in a way that feels true to the show. Mabel’s relentless optimism clashes perfectly with Dipper’s paranoia as they uncover a new conspiracy. The fic also weaves in lesser-known cryptids from the series, like the Shapeshifter, which adds depth. Another gem is 'Journal 4,' a pseudo-canon expansion where Dipper secretly continues Ford’s research. The emotional beats hit hard, especially when Mabel discovers his hidden notes and realizes how much he’s still grappling with their summer adventures.
For something lighter, 'Mabel’s Guide to Chaos' is pure joy—a series of vignettes where Mabel drags Dipper into increasingly absurd schemes, from starting a underground glitter empire to befriending a group of rebellious gnomes. The dialogue crackles with energy, and it captures the show’s balance of heart and absurdity. If you’re into crossovers, 'Falls Beyond' merges Gravity Falls with 'Rick and Morty,' but keeps the twins’ bond front and center. Dipper’s existential crises meet Mabel’s unshakable love for sweaters, and it’s weirdly touching. Honestly, half the fun is seeing how writers reinterpret their relationship post-Weirdmageddon—some go fluffy, others delve into trauma, but the best fics make them feel like real siblings.
You're hitting on one of those pairings that's just built for unbearable slow burns. The sheer difference between Dipper's analytical curiosity and Bill's chaos makes every charged glance feel like a ticking bomb. I still think about 'A Shift in Gravity' as a masterwork in that department—the author nails Dipper's frantic attempts to outsmart a Bill who's temporarily stuck in a human-ish form. The power imbalance is always there, but it's channeled into this intellectual dance full of barbed compliments and veiled threats that somehow morph into something else. The romantic tension isn't in grand declarations, but in the quiet moments where Bill's amused fascination seems a little too genuine, and Dipper's hatred starts looking suspiciously like obsession.
For a completely different flavor, 'Pine Tree's Puzzle' takes a lighter, almost rom-com approach that still builds a fantastic push-pull dynamic. It's set in a weirdness-free AU where Bill is just a frustratingly charming grad student and Dipper is the TA. The tension comes from their constant bickering that feels like flirting, and the mystery of whether Bill is actually into him or just messing with him for fun. It’s less cosmic horror and more about the thrill of the chase, and the will-they-won't-they is sustained right up until the very satisfying end.