One possible plot could be that Naruto and his friends are transported to the Nickelodeon universe. They end up in Bikini Bottom and have to team up with SpongeBob and his pals to stop an evil force that threatens both their worlds. Maybe an old enemy of Naruto uses some sort of magic to merge the two universes and create chaos.
Naruto and Timmy Turner could be an interesting pairing. Naruto is all about achieving his dreams through hard work and determination, while Timmy has his fairy godparents to grant his wishes. They could learn a lot from each other. Naruto could teach Timmy about perseverance, and Timmy could show Naruto the power of imagination.
Begin by deciding on a central plot. Let's say you're doing a crossover of 'Aang' from 'Avatar: The Last Airbender' and 'CatDog'. Maybe there's a strange spirit that has the power to split CatDog apart, and Aang has to use his airbending skills to put them back together. You also need to get the voices of the characters right. Read up on how they talk in their original shows. And don't forget to set the scene, whether it's in the world of 'Avatar' or the wacky world of CatDog.
One idea could be Danny Phantom teaming up with characters from other Nickelodeon shows to fight a common supernatural threat. For example, he could join forces with the Teenage Mutant Ninja Turtles. They could use their unique skills, Danny with his ghost powers and the Turtles with their ninja skills, to take on a powerful ghost - mutant hybrid enemy.
One popular Nickelodeon crossover fanfiction could be one that combines 'SpongeBob SquarePants' and 'The Fairly OddParents'. Maybe Timmy Turner visits Bikini Bottom and chaos ensues as he tries to use his fairies' magic there. Another could be a crossover of 'Avatar: The Last Airbender' with 'Teenage Mutant Ninja Turtles', where the bending powers meet the ninja skills.
The Fairly OddParents' Timmy Turner could be a fun character to include. He has his own set of magical fairy godparents. Imagine the chaos that could ensue when Danny's ghost powers and Timmy's fairy - granted wishes interact. They could accidentally create some really wild situations as they try to solve a problem together in a shared Nickelodeon universe.
A Naruto and Albedo fanfiction crossover could be really interesting. It could start with Naruto somehow ending up in the world where Albedo exists. Maybe he gets there through a strange jutsu gone wrong. Naruto's positive and determined personality could contrast with Albedo's more complex nature. They could team up to face a common enemy, with Naruto's combat skills and Albedo's knowledge of her world combining to create a unique dynamic.
In a Naruto - Skullgirls fanfiction, Sakura could team up with one of the Skullgirls. Sakura's medical ninjutsu combined with the brute force of a Skullgirl character would make a formidable duo. They could go on adventures together, facing off against common enemies. It would also be fun to see how the two different art styles blend in the fanfiction, like Naruto's more traditional anime look with the unique, somewhat gothic style of Skullgirls.
One possible scenario in a Naruto - Kaneki fanfiction could be that Kaneki somehow ends up in the Naruto world. Maybe through a strange portal or some sort of jutsu gone wrong. He might initially struggle to adapt to the different environment and the presence of chakra. But his own unique kagune abilities could be seen as a strange new form of power in the Naruto universe.
A Naruto and Albedo fanfiction crossover could be really interesting. They are from different fictional universes, Naruto from the ninja - filled world of Hidden Leaf Village and Albedo from the more fantastical world of Genshin Impact. In this fanfiction, perhaps they could meet through some sort of interdimensional rift. Naruto's skills as a ninja, like his shadow clone jutsu, could be a source of amazement for Albedo, who is more into alchemy and magic in his own world. They could team up to face a common enemy that somehow threatens both of their worlds, learning from each other's unique abilities along the way.