Maybe Naruto finds out that there are some English magic users who mistake him for a powerful wizard due to his chakra abilities. This misunderstanding could create some really interesting and comical situations, like when they try to enroll him in their magic school and he has to explain his ninja powers.
One possible plot twist could be that Naruto's unorthodox training methods clash with the more traditional approach of Team 10. For example, Naruto might try to introduce his shadow clone training, but the members of Team 10, like Shikamaru who prefers more strategic and less energy - consuming methods, initially resist. This could lead to some interesting character development as they learn from each other. Another plot twist could be Naruto's relationship with Ino. Since Naruto has a history with Sakura, Ino might be jealous or feel threatened at first. But as they work together on missions, they could develop a unique bond, perhaps even a friendly rivalry that helps both of them grow stronger.
A plot twist could be related to Yugito's tailed beast. Maybe the power of the two - Naruto's Nine - Tails and Yugito's Two - Tails - has some unforeseen consequences when they get married. It could attract the wrong kind of attention from those who seek to use tailed - beast power for evil. Or perhaps the tailed beasts themselves have some sort of reaction to their union that changes the relationship between Naruto and Yugito, like they start to communicate with each other in a new and strange way through the beasts.
One possible plot twist could be that Tsunade trains Naruto not just in physical combat like she did with others, but also in medical ninjutsu. This would be unexpected as Naruto is more known for his brute force. Maybe Naruto uses his new medical skills in a creative way during a battle, like healing his opponents to show mercy and then defeating them when they are off - guard.
Another plot twist could be that Naruto getting the Sharingan is part of a much larger conspiracy. The Akatsuki might be behind it, trying to create a super - powerful being that they can control. So Naruto has to figure out who's behind this while also dealing with the new power. He might find that there are some hidden motives among his own allies as well, which would really shake up the story.
One possible plot twist could be that Naruto's stand has a power that is completely opposite to his normal ninja abilities. For example, if Naruto is known for his brute strength and large - scale attacks, his stand could have the power of stealth and infiltration, forcing him to adapt to a different style of combat. Another twist could be that the stand is linked to an ancient evil, and Naruto has to struggle not to be consumed by its power while still using it to protect his village.
Well, a great plot twist could be that Naruto, as a cat, gets adopted by Sasuke unknowingly. Sasuke then starts to notice some strange things about this cat, like it seems to understand complex ninja concepts when he talks about them. This could lead to some really interesting interactions as Sasuke tries to figure out what's so special about this cat. And maybe Naruto, in cat form, has to protect Sasuke from a new threat without revealing his true identity.
One possible plot twist could be that the kidnappers are actually being controlled by an old enemy of Naruto's village who wants to use him as a bargaining chip to get some ancient scrolls. Another could be that Naruto is kidnapped by someone who thinks he is the key to a powerful jutsu they want to unlock, but in reality, they have the wrong idea about Naruto's abilities. Maybe the kidnappers are from a hidden group within the ninja world that has a grudge against the Uzumaki clan and Naruto specifically.
Well, perhaps in the fanfic, the Gunbai is actually a key to a different dimension. Naruto, while wielding it, accidentally opens this dimension and has to face new and strange enemies. He then has to figure out how to use the Gunbai not just as a weapon but also as a tool to close this dimension before it's too late.
A really interesting plot twist could be that Zabuza has a hidden past or connection to Naruto's family. For instance, perhaps he knew Naruto's father in a different context than what was previously known. This could change Naruto's whole perspective on his family and his place in the ninja world. Or, Zabuza could have been given a secret mission long ago related to Naruto that he never fully completed, and now raising Naruto becomes a way to fulfill that mission. This would add a whole new layer of mystery and depth to the fanfic.
A plot twist could be that Slade has an ulterior motive for training Naruto. Maybe he plans to use Naruto as a weapon against Konoha in the future. He might be secretly feeding information about the village's defenses to an enemy while training Naruto. So, when Naruto discovers this, he has to find a way to stop Slade and also deal with the fact that he has been unknowingly part of a scheme against his own home.