The main antagonists could be some of the conservative Iwa ninjas who oppose Naruto joining their village. They might see him as a threat to their traditional ways and values. Also, there could be some rogue ninjas from other villages who target Naruto because they see him as an easy target now that he's in a new and unfamiliar environment.
One possible plot development could be Naruto facing initial hostility in Iwa. Since he's from Konoha, the Iwa ninjas might be suspicious of him at first. But Naruto, with his determination and unique skills like the Rasengan, could gradually earn their respect. He might also learn new jutsu unique to Iwa and form new alliances, perhaps even finding a way to bridge the gap between Konoha and Iwa in the long run.
Well, one possibility could be that Naruto is banished from Konoha due to some false accusations. When he joins Iwa, he might start learning their unique jutsu and fighting styles. He could also face a lot of distrust at first from the Iwa ninjas because he's from Konoha. But as time passes, he proves himself and becomes an important part of Iwa, maybe even leading some missions against common enemies of both villages.
Maybe there's a corrupt elder in Iwa who doesn't trust outsiders. This elder sees Naruto as a threat to Iwa's traditional ways and tries to get rid of him. He might spread false rumors about Naruto within the village and try to turn the other ninjas against him.
Well, in fanfiction, if Naruto joins Iwa, he'd likely bring his unique skills and determination. His Rasengan and his never - give - up attitude could shake things up in Iwa. He might also face some initial distrust from the Iwa ninjas as he's from Konoha. But eventually, he could form new bonds and teach them some of Konoha's ways while also learning from Iwa's techniques.
Well, one possibility is that Naruto would face a lot of distrust in Iwa at first. He's from Konoha, after all, which has had a history of conflict with Iwa. But Naruto being Naruto, he might gradually win over some of the Iwa ninjas with his determination and unique skills. He could learn new jutsus specific to Iwa's style of fighting, which would make him an even more formidable ninja.
If Naruto joins Iwa in fanfiction, his character development could be significant. He'd have to deal with being an outsider at first. This would test his resolve and make him grow in patience. He may also start to see the world from a different perspective, as Iwa's goals and values might be different from Konoha's. This could lead to him becoming more diplomatic and understanding of different ninja cultures.
One possibility in the 'Naruto banished joins Akatsuki' fanfiction is that Naruto's presence would create a lot of internal conflict. Some members of Akatsuki might see him as a threat to their plans, while others might be intrigued by his power and ideals. Naruto, on the other hand, might be constantly torn between his loyalty to the Hidden Leaf (even though he was banished) and his new position in Akatsuki. He could also try to use Akatsuki's resources and connections to find out more about his own past and the secrets of the ninja world that the Leaf Village might have been hiding from him.
In this kind of fanfiction, Naruto might face a whole new set of challenges in Suna. He could bring his unique skills and determination to Suna. Maybe he'd form new friendships with Suna ninjas and help improve Suna's overall strength. He could also share his knowledge about certain jutsus that are unique to Konoha.
Well, he could gain new and powerful abilities. Maybe he discovers a hidden bloodline within himself or through some encounter related to the new bloodline he joins. He might use these new powers to prove his worth to those who banished him.