One idea could be a crossover with the Harry Potter universe. The Addams family could visit Hogwarts. Gomez could be fascinated by the magic spells and try to learn some dark arts in his own Addams - like way. Morticia might be intrigued by the Forbidden Forest and its strange creatures. Wednesday could make friends with the more outcast students at Hogwarts, like Luna Lovegood. They would bring their unique Addams family charm and macabre sense of humor to the magical world.
A crossover with the Scooby - Doo gang could also be great. The Addams family would be perfect in a mystery - solving adventure with Scooby and the gang. They might find themselves in a spooky old mansion that the Scooby gang is investigating. The Addams family would be unfazed by the supposed ghosts and monsters, while Shaggy and Scooby would be both terrified and intrigued by the Addams family's odd behavior. The contrast between the two groups would make for a really fun and comical fanfic.
One idea could be a time - travel plot where a member of the Addams family goes back in time to meet their ancestors. Another could be a story where they adopt a new and very strange creature into the family. Maybe a story about the Addams family hosting a very unusual party and inviting all their odd friends from different dimensions.
One idea could be a crossover with 'The Simpsons'. Imagine Peter Griffin and Homer Simpson getting into a wacky competition, like a donut - eating contest that somehow gets out of control. Another could be a crossover with 'South Park'. Maybe the kids from South Park visit Quahog and chaos ensues as the different humor styles clash. A third idea might be a crossover with a superhero universe. Picture Stewie teaming up with Spider - Man to save the day in a very 'Family Guy' - style adventure.
A plot could involve the Volturi from Twilight coming to the Addams family's town. The Addams family, not ones to be intimidated, stand up to them. Gomez and Morticia show the Volturi that their family has its own set of rules and powers that are not to be trifled with.
One idea could be that the Addams Family, being the strange and macabre family they are, somehow get involved in the vampire - hunting activities of the Hellsing Organization. Maybe they see the vampires as kindred spirits in a way, but also recognize the danger they pose. Another could be a situation where a member of the Addams Family becomes a target of the vampires in the Hellsing universe, and the Hellsing crew has to work with the family to protect them.
One idea could be that a college student from the Addams family decides to study a very unusual major like 'The Art of Torture Through Music'. They could create chaos in the music department with their dark and spooky compositions. Another plot could involve an Addams family member falling in love with a 'normal' college student and trying to introduce them to the family's strange ways. Maybe they take their love interest to a family gathering where the usual Addams family antics like summoning the dead for a party game are on full display.
One idea could be that the Addams family somehow ends up in the wizarding world of Harry Potter. Maybe Wednesday Addams could be a transfer student to Hogwarts. She would be really unique among the students, with her strange interests and dark sense of humor. She might not be too impressed with the magic at Hogwarts as she has her own 'creepy' ways of doing things at home.
One interesting crossover could be the Addams family's spooky mansion being a hidden location in the wizarding world. Maybe the ghosts in the Addams family mansion are actually the result of some botched wizarding spell long ago.
One idea could be to cross it with a superhero universe. For example, Anya could suddenly gain real superpowers and the Forger family has to deal with that while still maintaining their cover. Twilight might have to figure out how to use Anya's powers for his missions without blowing their family facade.
One popular plot idea could be a new adventure for the Addams family in a modern setting. Maybe they have to deal with a new neighbor who is initially scared of them but then learns to accept their unique ways. Another could be a family member getting into trouble at school or work because of their Addams - like behavior and the rest of the family coming to their rescue.
A popular 'The Addams Family' fanfic is 'Wednesday's New School'. It focuses on Wednesday's experiences at a new school full of normal kids. It's really interesting to see how she interacts with them and how the Addams Family values play out in that setting. There are also some really well - written fanfics that explore the relationship between Gomez and Morticia in different situations, like 'Gomez and Morticia: Love in the Shadows'.