They could bring new ideas. For example, if they come from a different place, their cultural ideas might influence Konoha's fashion or food. Their presence might also inspire the local kids to work harder in their ninja training, seeing two new and exciting role models.
Naruto would probably be conflicted. On one hand, he has a deep love for Konoha, his home. But on the other hand, he might have been hurt by the past events that led to his departure. He could initially be hesitant, but eventually be swayed by the thought of seeing his friends again.
Well, I'm not entirely sure if there's a specific 'Naruto is Konoha's Batman' fanfiction. However, given the popularity of both Naruto and Batman, it's very likely that someone has thought about this concept and created a fanfic. It could be really interesting, imagining Naruto with Batman - like qualities in the context of Konoha. Maybe he would use his ninja skills in a more detective - like way, similar to how Batman operates in Gotham.
One possible reason could be that Konoha has made decisions without considering Naruto's opinions. Maybe they have made policies that Naruto believes are unjust towards certain groups, like the treatment of the Uchiha clan in the past. Naruto, who values fairness and friendship, would be angry at such insensitivity from his village.
Perhaps Naruto discovers some dark secrets about Konoha that go against his values. Like if the village has been involved in unethical practices that he can't overlook. This could be things like using underhanded tactics against other villages, which would make Naruto, with his strong sense of justice, turn against Konoha.
Well, it could be that the wielder of the Rinnegan has the ability to control powerful forces like the Six Paths techniques. They might use the Deva Path to create massive gravitational pulls that start to crumble the buildings in Konoha. Or perhaps with the Preta Path, they could drain the chakra from all the ninja in Konoha, leaving them defenseless against further attacks, which eventually leads to the destruction of the village.
His anger might cause a strain in his relationship with his friends at first. They may not understand why he is so angry and feel hurt by his sudden change in attitude. For example, Sasuke might be confused by Naruto's anger towards Konoha as he has his own complex feelings about the village.
Perhaps he discovered some dark secrets about Konoha that made him lose faith in the village. For example, if he found out that the village leaders were involved in unethical or immoral activities that were against his values, it could make him hate Konoha. He might also feel betrayed if his so - called friends turned their backs on him for some reason.
One possible reason could be a sense of betrayal. Maybe he felt abandoned or mistreated by Konoha in some way. For example, if he was shunned because of the power within him that others feared.
In this fanfiction, the reception could be mixed. On one hand, the older generation who remembered Minato and Kushina would be very glad to see them return. They were important figures in Konoha's history. But on the other hand, some of the younger shinobi who didn't know them might be a bit cautious at first. Still, once they learn about their heroic deeds, they would likely warm up to them.