Well, you could do a time - travel Disney Infinity crossover fanfiction. Let's say Baymax from Big Hero 6 accidentally activates a time - traveling device and ends up in the world of Aladdin. There, he meets Aladdin and they team up. Then, other characters like Mulan start popping up in different time periods of the Disney Infinity universes due to the time - travel glitches, and they all have to work together to set things right.
One idea could be a crossover between characters from different Disney Infinity franchises in a post - apocalyptic world. For example, Jack Sparrow from Pirates of the Caribbean and Elsa from Frozen teaming up to find a way to restore their shattered universes. Another idea is to have Buzz Lightyear and Stitch on an intergalactic adventure where they have to stop an evil force that is threatening multiple Disney worlds.
One idea could be to have the Infinity Armor cross over with a superhero universe. The wearer of the armor could team up with popular superheroes to fight a common enemy. Maybe they battle an interdimensional threat that only their combined powers can defeat.
One idea could be that Goku ends up in the world of Aladdin. He might mistake the flying carpet for a new kind of Ki - powered vehicle. And he could use his martial arts skills to help Aladdin fight off Jafar's minions in a really action - packed way.
One idea could be that Elsa accidentally travels to another Disney world like Aladdin's Agrabah. There, she could use her ice powers in the desert, creating ice sculptures that amaze the locals. Another could be a crossover with The Little Mermaid. Maybe Ariel discovers an iceberg with Elsa trapped inside and helps her get free. They could then explore each other's worlds together.
One idea could be having Maleficent and Ursula team up. Maleficent could use her dark magic to help Ursula get more powerful in the ocean realm. Maybe they plot to take over both the land and the sea. They could start by causing chaos in the kingdoms near the shore, like making storms and scaring the fishermen.
One idea could be that the Avengers get transported to a Disney fairy - tale world. For example, they end up in Arendelle from 'Frozen'. Iron Man could try to figure out how to adapt his suit to the cold, while Captain America tries to lead the way through the icy terrain. Thor might find similarities between the magic in Arendelle and Asgardian magic.
A great Disney crossover fanfic idea is to cross "Moana" with "Mulan". Moana's seafaring skills and Mulan's warrior abilities could combine in an adventure. Maybe they team up to fight a common enemy that threatens both their lands. Also, a "Cinderella" and "Sleeping Beauty" crossover would be interesting. They could both face challenges in a new, combined story.
One idea could be that the Hogwarts students take a field trip to Disneyland. They could be amazed by the magical rides and meet Disney characters. For example, Hermione might be fascinated by the technology behind the rides and try to figure out how they work while Harry and Ron are more interested in the food. Another idea is that Disney villains team up with Voldemort. The Evil Queen could use her magic mirror to help Voldemort find Harry Potter. And Maleficent could use her dark powers to assist in the battles at Hogwarts.
One interesting idea could be characters from Disney movies interacting with Star Wars characters in unexpected ways. For example, Mickey Mouse might find himself on the Millennium Falcon, causing chaos with his cheerful and curious nature. Another idea could be a Disney princess using the Force. Maybe Belle could use her intelligence and newfound Force powers to outwit the Sith Lords. And then there's the concept of Disney sidekicks in the Star Wars universe. Like how Dopey from Snow White could accidentally cause a distraction during a lightsaber battle.
Another plot could be that there is a magical rift that opens between the 'Twitches' world and Disney World. This causes some Disney characters to be transported to the 'Twitches' realm and vice versa. The 'Twitches' characters have to help the Disney characters adapt to their new, more magical - chaos - filled world, while also trying to find a way to close the rift before it causes more chaos. There could be a lot of fun cultural clashes and misunderstandings between the two groups of characters.
One idea could be a crossover between Mickey Mouse and Elsa from Frozen. Imagine Mickey trying to skate on Elsa's ice creations. Another could be a meeting of Stitch and Simba. Stitch's wacky antics in the Pride Lands would be really fun to write about. And a crossover of Aladdin and Tinker Bell, with Tinker Bell using her pixie dust to help Aladdin's magic carpet fly even better.