In this fanfiction, Naruto might be adopted by a family with a mysterious past. They could be descendants of an ancient ninja clan that was banished from Konoha long ago. As Naruto grows up with them, he uncovers secrets about his own family and the old grudges that led to his adoption outside Konoha. This could lead to a series of events where Naruto tries to reconcile the differences between his new family and Konoha.
One possible plot could be that Naruto is adopted by a powerful ninja from another village. This new family might train him in different techniques and he could grow up with a new perspective on the ninja world. Maybe he would form alliances with his new village against Konoha at first, but later realize the importance of unity among all villages.
Maybe an old hermit who lives in the mountains outside Konoha adopts Naruto. The hermit could be a master of some long - forgotten ninjutsu. Under his tutelage, Naruto would learn these ancient techniques and use them to protect the land around the hermit's dwelling. He might also gain a deeper understanding of nature and chakra from the hermit.
One possibility could be that Naruto leaves Konoha due to feeling ostracized still despite his efforts. He might start a new life in a small village on the outskirts. There, he could train in solitude, learning new jutsus that are unique to the local environment. He may also encounter new characters who help him see a different side of the ninja world, away from the politics and rigid structure of Konoha.
It could be that Naruto has a vision of a different kind of life or place where he can truly be at peace. He might meet someone from another village or group who shows him an alternative way of living that is more appealing than staying in Konoha. And so, he gives up on Konoha to pursue this new path.
Well, perhaps in this 'naruto invasion of konoha fanfiction', Naruto is actually being mind - controlled to lead the invasion himself. It would be a huge shock for his friends and allies when they find out. This could lead to a lot of internal conflict as they try to figure out how to stop him without hurting him.
One possible reason could be that Naruto discovers some dark secrets about the village leadership that go against his values. For example, if he finds out that they have been using underhanded means to maintain power.
Another plot development could be that with Sarutobi as his adoptive father, Naruto has access to different mentors. Sarutobi could call in favors from other great ninjas to train Naruto. This would expose Naruto to a wider variety of fighting styles and strategies. Maybe he gets trained by Kakashi earlier, or even has the chance to learn from some of the retired or older ninjas who usually keep to themselves.
One possible motive could be a misunderstanding. Maybe Naruto discovers some false information that makes him believe Konoha has betrayed him. For example, if he's wrongly led to think that the village elders are planning to harm his friends or his sensei. Another motive could be the influence of a powerful and evil entity that has somehow managed to control Naruto's mind. It could use Naruto's strength to achieve its own goal of destroying Konoha.
In fanfiction, Naruto might kill Konoha if he's under some sort of mind control. Maybe an enemy manages to manipulate his thoughts and turn him against the village. Also, if Naruto experiences a great loss because of Konoha's actions or inactions. Say, if his friends are killed due to Konoha's negligence in protecting them, and he blames the village as a whole. Or if he realizes that Konoha's system is so corrupt that it's causing more harm than good to the world.
In fanfiction, Naruto might snap at Konoha if he feels betrayed by his friends or the village. For example, if they don't support him when he tries to make important changes or if they side with someone who has wronged him. Also, if the village starts to become too controlling or authoritarian in the fan - created story, Naruto, with his free - spirited nature, would likely snap.
Maybe Naruto has seen too many unrealistic or out - of - character portrayals of Konoha in the fanfiction. For example, some might make Konoha overly cruel or its people too stupid, which goes against his understanding and love for his village.