Another great pair could be Stan and Rick. Stan is a con - man at heart, always looking for ways to make money or get ahead. Rick has all this advanced technology. Stan would probably try to swindle Rick out of some of his inventions, and Rick would see through Stan's schemes. Their cat - and - mouse game could be really entertaining, with Morty and the Gravity Falls kids getting caught in the middle at times.
Definitely Rick and Dipper. Rick is this super intelligent, jaded scientist who has seen so much of the multiverse, and Dipper is this young, eager mystery - solver. Their interactions would be really interesting as Dipper would be constantly asking Rick questions and Rick would be either annoyed or reluctantly impressed by Dipper's inquisitiveness.
I think Mabel and Morty would be an interesting pair. Mabel is all about fun, friendship, and her sweaters. Morty is often the more timid and normal one in his adventures with Rick. Mabel could bring out Morty's more fun - loving side and Morty could introduce Mabel to some of the strange things he's seen in his travels with Rick. They could have some really cute and wacky adventures together.
Rick and Dipper would be really interesting. Rick's cynical and scientific view would clash with Dipper's curious and somewhat naive nature. Dipper would be both fascinated and a bit intimidated by Rick's intelligence and his access to other dimensions. Rick might see Dipper as a young, impressionable mind that he could either corrupt or mentor in a strange way.
Rick and Grunkle Stan would be really interesting. They're both kind of cynical in their own ways. Rick could be dismissive of Stan's 'hustles' at first, but then they might find common ground in their experiences dealing with the strange and unknown. They could end up swapping stories about the weird things they've seen in their respective universes.
In a crossover fanfiction, Rick could be intrigued by the strange anomalies in Gravity Falls. He decides to study them, dragging Morty along. They run into the Pines family, and Rick starts making deals with Grunkle Stan to get access to some of the more mysterious areas of the town. However, his actions start to awaken some long - dormant and dangerous entities in Gravity Falls that both sets of characters have to deal with.
A possible crossover fanfiction could involve Dipper and Mabel trying to get Rick to help them solve some of the really tough mysteries in Gravity Falls. Rick might initially refuse, but then Morty convinces him. And along the way, they get into all sorts of misadventures with Bill Cipher maybe getting involved and trying to use Rick's technology for his own evil purposes.
Rick would be the most interesting. His unpredictable nature and vast scientific knowledge would create a lot of chaos and new possibilities. He could mess with Naruto's world in ways that no one else could, like creating new types of jutsu through his technology or transporting Naruto to bizarre dimensions.
One possible plot could be that Rick and Morty accidentally portal into the Gravity Falls universe. They meet Dipper and Mabel, and Rick's technology starts malfunctioning because of the strange magical forces in Gravity Falls. Morty and Dipper team up to try and fix it while Mabel tries to get Rick to participate in some of her wacky Gravity Falls activities.
Hermione and Mabel would be an amazing pair. Hermione's intelligence and studious nature would contrast with Mabel's fun - loving and creative personality. They could work together to solve problems in Gravity Falls. For example, Hermione could use her magic to analyze the strange symbols and creatures, while Mabel could come up with out - of - the - box ideas to deal with them, like using her knitting skills to create something that can trap a supernatural being.
I think Dipper and Star would be a really interesting pair. Dipper is all about mystery - solving and Star is this wild magic - using princess. They could learn a lot from each other. Dipper could help Star with his logical thinking when it comes to dealing with some of the more complex magical problems she faces, and Star could show Dipper some really cool magic that he's never seen before.
Rick and Tony Stark would be a really interesting pairing. They are both super - intelligent inventors. Rick's off - the - wall and often unethical scientific methods would clash with Stark's more morally - guided approach. It would be fascinating to see them argue over the best way to build a device or solve a problem.
Rick and the Warden would be really interesting. Rick is so used to being in control and having his own set of rules in his own dimension. The Warden, on the other hand, is in charge of the chaotic Superjail. Their clash of egos and different ways of handling things would make for great drama. Rick would probably try to outwit the Warden, and the Warden would try to assert his authority over Rick.