The clash of different power systems would make it interesting. Naruto has his chakra - based ninja techniques, like the Shadow Clone Jutsu and Rasengan. Xehanort has his Keyblade and his dark magic. Seeing how these powers interact, whether Naruto can use his speed and clones to outmaneuver Xehanort's attacks or if Xehanort's magic can nullify Naruto's jutsu, would be exciting.
The character development of Naruto in Xehanort's world would be a major draw. Naruto is a character who has grown from an outcast to a hero in his own story. In a fanfiction where he is in Xehanort's world, we could see him develop new relationships, face new moral dilemmas. For example, if he has to choose between saving his new friends in Xehanort's world or going back to his own world to protect his old friends. This kind of internal struggle and growth would make the fanfiction really interesting.
I'm not sure if there is an exact 'naruto is xehanort fanfiction' out there. But if it existed, it might be a really strange and creative crossover. It could potentially involve Naruto somehow getting involved in Xehanort's schemes or world, maybe Naruto's powers being used in the context of Xehanort's story. It would be a very wild combination of two very different fictional universes.
An interesting Naruto - Okami fanfiction could involve Naruto learning the powers of the Celestial Brush. It would be cool to see him use those powers in his own unique way, like drawing with his chakra instead of ink. For example, he could draw a giant fox using the Celestial Brush techniques, but with his own ninja - style twist.
Seeing Naruto's growth in a new context. In his own story, he grows as a ninja. But in a Green Lantern fanfiction, he would have to adapt to new rules, new enemies, and a whole new way of using his powers. His relationship with the Green Lantern Corps and how he earns their respect would be an interesting aspect. And the idea of him facing off against some of the Green Lantern's iconic villains with his ninja - like strategies and the power of the ring would make for a very engaging read.
He might capture her for power. Kairi is an important figure, and her capture could give him an edge.
Maybe a really dark and twisted backstory. For example, if he grew up in extreme poverty where stealing was the only way to survive, and that habit carried over into his later life even when he didn't need to steal. Or perhaps he was influenced by some sort of evil entity that made him develop kleptomaniac tendencies.
Aqua, if she were involved, would be determined to save Kairi. She has a strong sense of justice and protecting the innocent. She would likely use her magic to try and track Xehanort and Kairi. Donald and Goofy would be loyal to Sora and follow him into the fray, but also try to keep Sora from making hasty decisions. They would offer their support in combat and also try to think of practical ways to free Kairi, like finding Xehanort's weaknesses.
Power is a common theme. Xehanort is often a power - hungry character, and in crossovers, his pursuit of power is pitted against the powers and rules of the new universe he enters. For example, if he crosses over into a universe with a strict moral code regarding magic use, his power - hungry ways will be challenged.
You can often find such fanfiction on dedicated fanfiction websites. Some popular ones include Archive of Our Own. Just search for 'Young Xehanort and Eraqus' on the site, and you'll get a list of relevant stories.
Perhaps if it delved into the idea of friendship boundaries. Maybe Naruto starts to rely too much on Sasuke in a way that Hinata misinterprets as something more than friendship. The fanfiction could explore how Naruto realizes his mistake, the importance of clear communication in relationships, and how to repair the bond with Hinata. It would be interesting to see the character growth of all three characters in such a scenario.
I think Kakashi and Genie from 'Aladdin' would make an amazing combination. Kakashi is always mysterious with his covered - up eye and his vast knowledge of ninjutsu. Genie, on the other hand, is full of magic and humor. Genie could use his magic to play pranks on Kakashi, and Kakashi could try to teach Genie some ninja moves. And then there's Ino and Ariel. Ino's strong - willed and confident personality paired with Ariel's curiosity about the human world could create some really fun and engaging interactions.