One possible storyline could be a friendly sparring session between Naruto characters and Avengers characters. For example, Naruto could show off his Rasengan to the Avengers while Iron Man shows off his latest suit upgrades. They could learn from each other's combat techniques.
Another interesting storyline could be a cultural exchange. The Naruto characters could introduce the Avengers to the concept of chakra and ninja training, while the Avengers could introduce modern technology and Western superhero ethics to the Naruto characters. This would lead to some funny and thought - provoking interactions, like Naruto trying to figure out how to use a smartphone or Captain America trying to do a tree - climbing exercise like a ninja.
One possible plotline could be that Naruto and Sonic meet in a strange dimension. They start off as rivals, each thinking their own skills are superior. But as they face various challenges in this new dimension, like powerful monsters or tricky mazes, they gradually learn to work together. Sonic's speed helps Naruto get to places quickly, and Naruto's ninjutsu gives Sonic an edge in combat.
One possible storyline could be Hanabi looking up to Naruto as a role model and trying to follow in his footsteps in terms of becoming a great shinobi. This could involve her training hard and seeking Naruto's advice on various ninja techniques.
One possible theme could be their rivalry turned into friendship. Maybe in the fanfiction, they start off with their typical squabbles but then gradually come to understand and respect each other more. For example, Squidward could initially be annoyed by Spongebob's antics as usual, but then through some shared experience like a big event in Bikini Bottom, they start to see the good in each other.
Perhaps there is a powerful artifact that both Spiderman and the Avengers are after. They end up in a conflict over it. Spiderman, with his street - smart ways, tries to outwit the Avengers and get the artifact for himself, believing he can use it for good in his own way.
A storyline might be that fem Kyuubi is in love with Naruto and Naruto, as her master, has to deal with these complicated feelings while also protecting the village. There could be a lot of internal conflict for Naruto as he tries to balance his duties and this new emotional situation.
A third theme could be the discovery of new worlds. The Naruto world with its hidden villages and the Pokemon world with its various regions are both full of mysteries. A fanfiction could be about characters from one world exploring the other, learning about the new cultures, creatures, and ways of life. This can be a great theme to build a family - friendly 'Naruto and Pokemon' fanfiction around.
One possible plotline could be a story where Deidara and Ino are forced to work together on a mission. They start off distrusting each other because of their different allegiances, but as they face challenges, they begin to understand and respect one another. This could involve them using their respective skills, like Deidara's explosive art and Ino's mind - related jutsu, to overcome obstacles.
One possible plotline could be that Bella and Draco meet in a magical crossover event. They initially dislike each other due to their different upbringings, but as they are forced to work together to solve a mystery that threatens both their worlds, they start to understand and respect each other. There could be no romantic or inappropriate elements, just a story of two characters from different universes finding common ground.
Perhaps there's a power - stealing device in the fanfiction. It's stolen by a villain and used on the Avengers, but Gwen is immune. So the Avengers, now with reduced powers, end up fighting Gwen who is trying to get the device back. Or it could be that Gwen discovers a threat to her world that the Avengers don't believe in, and they try to stop her from taking action, leading to a conflict.
One possible storyline could be that Desmond has a hidden power that only he and a secret villain know about. The Avengers initially suspect him of being a threat, but as the story unfolds, they realize he's been trying to protect them all along. Another could be that Desmond is from a parallel universe and his presence in the Avengers' world starts causing glitches in the space - time continuum.