One idea could be Naruto having to adapt to the different social expectations placed on girls in the ninja world. For example, she might struggle with the more restrictive clothing styles at first but then find ways to make it her own while still being a capable ninja. Another plot point could be how her relationships with other characters change. Sasuke might initially be confused by Naruto's new form but then come to see that she's still the same person deep down. Also, Naruto as a girl could inspire a new generation of female ninjas in the village, showing them that they can be just as strong and important as male ninjas.
In a fanfic where Naruto becomes a girl, a possible plot could be her journey to find a way to change back. Along the way, she has to deal with the strange looks and comments from the villagers. However, she also starts to enjoy some aspects of being a girl, like the way she can use her charm to get information from people. She might also get involved in a love triangle, with some characters falling for her new female form while others still see her as the old Naruto. This could create a lot of drama and interesting character development.
One idea could be that Naruto dresses as a girl for a mission. Maybe it's a stealth mission where he has to infiltrate a female - only place. He initially struggles with acting like a girl but then starts to learn the nuances and even uses his new identity to gain unexpected allies.
One idea could be that Sasuke, as a girl, has to deal with different social expectations in the ninja world. For example, she might face more discrimination or different forms of training. Another plot could involve her relationships with other characters changing drastically. Naruto, for instance, might see her in a new light and their friendship could take on a different dynamic, perhaps with some romantic undertones.
One idea could be Naruto fully embracing the Kyuubi's power and using it in unique ways. For example, he might be able to transform into a new, more powerful form that combines his own skills with the raw power of the Kyuubi. He could also use the Kyuubi's chakra to perform new jutsus that are previously unthinkable. Another plot idea is that Naruto starts to think and act more like the Kyuubi in some aspects, which causes conflict among his friends and allies as they try to figure out if he's still the same Naruto they know.
A possible plot is that Naruto accidentally drinks a magic potion created by an eccentric inventor. This potion makes him handsome but also gives him some strange powers related to charm. He has to learn to control these new powers while dealing with the attention he gets from everyone, including some unwanted attention from villains who want to use his new charm for their own evil purposes. In the end, he figures out how to reverse the potion but decides to keep some of the confidence his new looks gave him.
One plot idea could be Naruto facing an extremely difficult mission during the Chunin Exams that tests not only his combat skills but also his strategic thinking. For example, he might have to rescue hostages in a complex maze-like fortress while being outnumbered by enemy ninja. Another idea is that Naruto discovers a new and unique jutsu during his training for the Chunin rank, which gives him an edge in the exams but also draws unwanted attention from other villages. Maybe he could form an unexpected alliance with a rival ninja during the exams to overcome a common enemy.
One idea could be that Naruto has to go through a series of ancient trials in a hidden and dangerous realm to become a sage. He might face illusions of his past failures and have to overcome them. Another could be that he has to learn from a reclusive and cranky old sage who initially doesn't trust him but Naruto wins him over with his determination. And a third could be that Naruto discovers a new form of chakra related to sage mode that he has to master while also fending off enemies who want to steal this power for themselves.
One idea could be that Naruto becomes undead and has to deal with the fact that he's no longer fully human. He might struggle with his new identity and how his friends will react. For example, Sasuke could be initially suspicious and conflicted about this new Naruto.
One interesting plot idea could be the challenges they face in ruling the Hidden Leaf together. For example, dealing with political unrest within the village. Another could be Hinata's role in supporting Naruto as he adjusts to the responsibilities of being Hokage. Maybe she uses her Byakugan to help gather intelligence for the village's security. Also, their family life could be explored, like how they raise their children in the midst of their busy lives as leaders of the village.
One idea could be Naruto facing unexpected challenges right before his coronation as Hokage. Maybe a new enemy emerges that questions his worthiness, leading to a final battle where he has to prove himself not just as a powerful ninja, but also as a true leader. Another plot could involve Naruto dealing with internal village politics. As he is about to become Hokage, different clans start vying for more power and influence, and Naruto has to balance their demands while still maintaining the unity of the village.
One interesting plot could be Naruto, now as a girl, having to deal with the different expectations in the ninja world. For example, she might face discrimination at first because of the sudden change, but then use her unique skills and understanding of both genders to her advantage. Maybe she could infiltrate an all - female group that was previously off - limits to boys and uncover a hidden plot.