One plot idea could be that the Sound Spy has the ability to copy not just jutsus like a certain Uchiha, but also the emotions and memories associated with them. This could lead to some really complex character interactions within the Naruto universe. Another idea is that the Sound Spy is actually a double agent working for Konoha all along, and their mission is to expose Orochimaru's true plans from the inside of the Sound Village.
Well, perhaps they are sent to spy on a powerful and mysterious clan. Naruto's rasengan ability might come in handy if they are discovered, while Hinata can use her Gentle Fist techniques to defend and also gather intel. They could start to uncover a dark secret about the clan that has implications for the entire ninja world. Maybe the clan is trying to revive an ancient and dangerous jutsu, and Naruto and Hinata need to stop them.
One idea could be a story where a spy is tasked with infiltrating the Hidden Leaf Village to steal a secret jutsu. Another could be a fanfic about a ninja spy who discovers a conspiracy within their own village. Maybe a story of a spy from a minor village trying to gather intel on the major villages' alliances.
One idea could be to create an alternate origin story for the main character in Spy Game. Maybe they were initially a hacker who got recruited into the spy world after accidentally uncovering a major conspiracy. Another idea is to have a cross - over with another popular spy franchise, where characters from both worlds have to team up to take down a common enemy.
Maybe a plot where Naruto's Sound Release is related to an ancient and forgotten clan. He has to learn about his heritage to fully master this power. He could go on a journey to find the remnants of this clan and uncover secrets about his newfound ability along the way. This would involve a lot of exploration and interaction with different characters from the Naruto universe.
The Sound Spy's character can be developed by giving them a unique fighting style. For example, they could use sound - based jutsus in a very creative way, like creating illusions through sound vibrations. Also, their backstory is crucial. Maybe they were forced into spying for the Sound Village due to a threat against their family.
One idea could be a Spy x Spy fanfic where the two spies have to team up against a common enemy that is far more powerful than any they've faced before. This could lead to some interesting character development as they learn to trust each other.
An interesting plot idea for Naruto fanfic might be to focus on the life of a minor character. For instance, what if we told the story of a genin who never made it to be a chunin but still had a significant impact on the village in some other way? Or a story where all the ninja abilities are suddenly switched among the characters, and they have to adapt to these new powers while still facing their usual enemies. This could lead to some really fun and unexpected character interactions.
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 possible plot could be Naruto getting lost in the Sound Village territory and being mistaken for a spy. He then has to prove his innocence while also learning about the Sound ninja's way of life. This could lead to some interesting battles and cultural exchanges.
Perhaps a fanfiction where one of the children discovers a hidden talent for music composition. They start creating their own music, and Maria helps them to develop this talent further. It could involve them performing their original compositions at a big event in Salzburg.