Well, it could be about Naruto somehow being transported to the Star Wars universe of The Force Awakens. Maybe he teams up with Rey. He could use his ninja skills along with the Force, like using his chakra control to enhance his use of the Force.
One interesting plotline could be about Naruto learning new and unique jutsu from the Force. Maybe he combines his chakra with the Force in unexpected ways, like creating a new type of Rasengan infused with Force energy.
Naruto and Rey would be likely to interact. Naruto's positive and determined nature would complement Rey's own strong will. They could exchange knowledge about their respective powers, with Naruto showing Rey how to control her chakra (if she had it) and Rey teaching Naruto about the Force.
I think Naruto and Maz Kanata would be really interesting. Maz is this wise old being who has seen a lot. Naruto could learn a great deal from her about the ways of the Star Wars universe, and in return, he could show her some of his ninja techniques. They could exchange stories about their different worlds and the powers that exist within them.
Perhaps Sasuke could be like a Sith - like character in this fanfiction. He is drawn to the dark side of the Force due to his own inner turmoil and thirst for power. His Sharingan could have some interesting interactions with the Force - related abilities, like being able to sense the presence of other Force - users more acutely.
Another theme is the cultural exchange. The characters from the two universes come from very different backgrounds. So, in the fanfiction, you might see how a female Harry Potter adapts to the Star Wars universe and vice versa. This could include things like how she reacts to the different social hierarchies or the technology in the Star Wars world.
One possible plot could be that Harry Potter, while exploring new magical realms, stumbles upon a portal that leads him to the Star Wars universe. There, he meets Rey and they discover that magic and the Force have some similarities. They could team up to fight against a new dark force that is threatening both their worlds.
Obviously, Harry Potter and Rey could be the main characters. Harry has his skills in magic and combat against dark forces, and Rey has her connection to the Force and her combat skills. They could be the central duo, with each learning from the other.
Another idea could be that the Star Wars droids end up in the Naruto universe. C - 3PO and R2 - D2 could be mistaken for some kind of strange summons. Their technological knowledge could be used to either help or disrupt the shinobi world. For instance, they could help in deciphering some ancient shinobi texts that are encrypted in a way similar to Star Wars' galactic codes.
Archive of Our Own (AO3) is a great platform. It has a large collection of fanfictions, including many related to The Force Awakens. The site is well - organized, making it easy to search for specific stories or characters. Another one is FanFiction.net. It has been around for a long time and has a huge community of writers and readers. You can find a lot of different interpretations of The Force Awakens there.