It could be someone who was also reincarnated from the Naruto universe but with a twisted sense of purpose. Maybe Orochimaru was reincarnated and is now using his knowledge of the past and new - found powers in this new world to cause chaos and try to stop Naruto and Sasuke from reuniting and fulfilling their new destinies.
One idea could be that they are reincarnated in a modern world. Naruto could be a struggling artist and Sasuke a cold - hearted business tycoon. Their past memories start to resurface, and they have to figure out how to deal with their new identities while still having that underlying connection from their past lives.
One great 'Naruto Sasuke Crossover Fanfiction' is 'The Bond Beyond Worlds'. It delves into an alternate universe where Naruto and Sasuke are transported to a different realm. The story is amazing as it shows how they have to rely on each other more than ever, using their unique skills to survive and find a way back home. It also explores their relationship in a new light, with some really touching moments.
Well, it's also about the potential for new storylines. The Naruto and Sasuke characters are already so well - developed in the original series. When you put them in a crossover, you can create all sorts of interesting plotlines. Maybe they end up in a world where their ninja skills are useless, and they have to start from scratch. This kind of novelty attracts a lot of readers.
Love and friendship are also common themes. The relationship between Naruto and fem Sasuke can take on different forms, from a deep platonic bond to a romantic one. Writers often explore how their feelings for each other develop in new ways compared to the original story. In some fanfictions, they support each other through difficult times, showing a strong friendship. In others, there's a budding romance that adds a whole new layer of drama and emotion to the story.
In this type of fanfiction, the power levels would be really interesting to explore. Naruto has his chakra and all his powerful jutsu like the Rasengan. Sasuke has his Sharingan and his own array of attacks. When compared to the powers of the demigods in Percy Jackson's world, such as controlling water like Percy or having super strength like some of the other demigods, there could be some epic battles and team - ups. They could also learn from each other. For example, the demigods could teach Naruto and Sasuke about Greek mythology, while Naruto and Sasuke could show them some cool ninja techniques.
Well, it could be a really interesting exploration of their relationship in a different context. Maybe in this fanfiction, they get married to unite their clans in a new way, bringing peace to the ninja world. Their personalities, which are so different yet complementary, would create a lot of drama and sweet moments in their married life.
One common theme is probably the reconciliation of their past differences. Since they had a lot of conflict in the original story, in the fanfiction, their marriage would be a way to show that they've moved past all that. Another theme could be the exploration of a new kind of power couple in the ninja world. They are both extremely powerful, and together, they could be unstoppable.
It could be Orochimaru. He's always had his eyes on Sasuke and Naruto has also been in his crosshairs. He could return with some new and more powerful jutsu, forcing Naruto and Sasuke to put aside their differences and fight him together. Maybe he has a plan to take over the entire ninja world this time.
One possible plot could be that Naruto and Sasuke, married, are somehow transported to the DxD world. They have to adapt to the new rules and powers there while also dealing with the reactions of the DxD characters to their relationship.