One idea could be a crossover with a supernatural detective show. The Hathaways could team up with the detective to solve a mystery that involves both their worlds. Maybe a powerful spirit is causing chaos in both the Hathaways' haunted house and the city where the detective operates.
Perhaps a crossover with a time - traveling show. The Hathaways get caught up in a time - traveling event and end up in different eras. They have to work with the ghosts in their family to find a way back home while also dealing with the challenges of each time period. This would allow for a lot of historical settings and interactions that would be exciting to write about.
A pairing between Taylor Hathaway and a young, brave character from another show could be interesting. Taylor's practical nature could balance out the more impulsive nature of the other character. They could face the challenges of the crossover world together.
Frankie and Louie are popular in fanfiction because they both have a deep connection to the haunted house. Their relationship can be developed in many ways within the context of the house's mysteries and the supernatural elements. Writers can create stories where they rely on each other to deal with the strange happenings, which makes for engaging reading. For example, a story could be about them using their combined skills to banish an evil spirit that is causing trouble in the house. Also, their friendship has room for growth and development, which is always appealing for fanfiction writers.
One great 'The Haunted Hathaways' Frankie x Louie fanfiction could be one where they go on a supernatural adventure together in their haunted house. It might involve them solving a mystery that threatens their family's harmony in the house.
A third idea is to cross it with a post - apocalyptic world. The haunted mansion becomes a refuge in a desolate world. However, it has its own set of challenges as the ghosts and spirits within the mansion are not used to the new outside threats. The survivors from the apocalypse have to team up with the mansion's spectral inhabitants to defend against new, more dangerous threats.
One idea could be a story where the characters discover a hidden room in the haunted mansion that holds the key to the mansion's dark past. Another could be about a group of friends who get trapped in the mansion during a storm and start experiencing strange paranormal events. Maybe a story where a character has the ability to communicate with the spirits in the mansion and tries to help them find peace.
One idea could be a crossover with the Dragon Ball Super universe and the DC Comics universe. Zamasu could team up with Darkseid, believing they share a similar view of bringing 'order' to their respective realms. Another idea is a crossover with the Naruto universe, where Zamasu tries to impose his will on the ninja world, facing off against powerful shinobi like Naruto and Sasuke. Or perhaps a crossover with the Star Wars universe, with Zamasu as a Sith - like figure, trying to gain control over the Force.
One idea could be that the turtles from 2012 somehow get transported to the 2018 universe. They could be really confused by the different art styles and the new gadgets the 2018 turtles have. The 2018 turtles, on the other hand, would be intrigued by the more traditional look of the 2012 turtles. This could lead to some funny moments as they try to communicate and figure out how to get the 2012 turtles back to their own universe.
One idea could be a Vampyr and The Witcher crossover. The main character from Vampyr could find himself in the world of The Witcher, facing different monsters and having to adapt to the new magic system there. He might encounter Geralt and they could either team up or be at odds due to their different views on handling supernatural beings.
One idea could be a Moana crossover with Frozen. Moana could end up in Arendelle due to a magical storm. She teams up with Elsa and Anna to stop an approaching iceberg that is threatening both her island and Arendelle. Moana's skills in sailing and her connection with the ocean could be combined with Elsa's ice powers to find a solution.
One idea could be that Greninja, being a ninja - like Pokémon, somehow gets transported to the Naruto universe. It could team up with Naruto and use its water - based attacks in combination with Naruto's Rasengan. Maybe Greninja's ability to blend into the shadows could be used in stealth missions in the Hidden Leaf Village.