Well, it might be that Naruto leaves the village to search for a new power source. In the context of a yaoi fanfic, he could meet a mysterious male stranger on his journey. They start off as comrades but gradually develop deeper feelings for each other. Their relationship could be full of drama, with Naruto having to balance his feelings for this new person and his ties to his old village friends.
It could change the power dynamics in the Naruto universe. If Naruto leaves the village in a yaoi fanfic, his absence might create a power vacuum. Enemies could see it as an opportunity to attack Konoha. Also, his new relationship with another male character could lead to new alliances or rivalries between villages depending on how the other villages view their relationship.
Well, Naruto could leave the village in a fanfic due to a prophecy. He might believe that leaving is the only way to fulfill a greater destiny that the village can't support. As he leaves, he starts to explore different cultures of the ninja world. He learns about new forms of jutsu and how other villages operate. He could also form a team with outcasts from different villages, and together they strive to change the way the ninja world views things.
Well, one possible plot could be Naruto starting from scratch. He might first gather like - minded ninjas who share his vision of a new kind of village. Then, they'd have to find a suitable location, perhaps a place rich in natural resources but also defensible. Naruto would use his charisma and his own experiences in Konoha to create rules that are fair and inclusive. For example, he could ensure that all ninja clans, no matter how small, have a voice in village matters. And he'd probably want to establish a ninja academy that focuses not only on combat skills but also on things like diplomacy and understanding different cultures among ninjas.
Maybe it's to protect the village. He could discover a threat that he can only face away from the Leaf Village, to keep the danger from directly reaching his home and loved ones. He leaves as a form of self - sacrifice.
In the sasunaru context, perhaps a rift between Sasuke and Naruto makes Naruto feel like he needs to leave to sort out his feelings. He might think that staying in the village constantly reminded of Sasuke and their complicated relationship is too much to bear, so he leaves to find his own path and hopefully reconcile with Sasuke on his own terms.
In one possibility, Naruto might leave the village to seek greater power on his own. He could feel that the village's teachings and training methods are limited. So, he embarks on a journey across different lands, meeting new shinobi and learning unique jutsu that the village doesn't offer. This could lead to him coming back much stronger, but also with a different perspective on the village and its values.
Perhaps Naruto in the Anbu has a personal mission that goes against the village's orders. For example, he might befriend someone from an enemy village who is actually innocent but is being targeted by Konoha. When the village refuses to listen to his pleas, he decides to leave. He'll use his Anbu abilities to protect his new friend and find a new place where they can both be safe, away from the political drama of the ninja villages.
The plot could involve a character from Naruto becoming the Kage of a village other than their own. For example, Naruto could end up as the Kage in the Sand Village. This would bring a whole new set of challenges and relationships. He'd have to deal with the different political situations, the unique shinobi culture of that village, and form new alliances or rivalries. Maybe he'd introduce new training methods inspired by Konoha, which could either be welcomed or resisted by the local shinobi.
One possible plot could be that an Uchiha, perhaps Sasuke or a new Uchiha character, decides to take over the village in a more peaceful way. He uses his sharingan powers to gain the trust of the villagers by showing them visions of a prosperous future under Uchiha leadership. He then reforms the village's political system to be more inclusive of the Uchiha clan's ideas and traditions.
Well, they could go on a journey to explore new lands. Maybe they'll discover a hidden village with unique ninja techniques. They might meet new friends or face new enemies along the way.