Well, it would completely disrupt the original plot. Naruto's loyalty to Konoha was a big part of his character. If he joined Iwa, he'd be seen as a traitor in Konoha. His relationships with friends like Sasuke and Sakura would be severely strained. And his goal of becoming Hokage in Konoha would no longer make sense. Instead, he might aim for a high position in Iwa. His training might also change as Iwa has different jutsu and fighting styles compared to Konoha.
With his family - like figures in Konoha, such as Iruka, the relationship would be put to the test. Iruka would probably be heartbroken but also hope that Naruto is doing what he thinks is right. In Iwa, Naruto might find a new mentor - like figure who could teach him different things compared to what he learned in Konoha. This new relationship could shape his ninja path in a whole new way.
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.
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.
Maybe Naruto has some sort of disagreement or falling - out with his family. This could lead him to seek a new start in Kiri. For example, if there are differences in values or expectations within his family that he can't reconcile with, he might choose to leave.
He might face a lot of challenges at first. The people in Kiri may not trust him easily as he is an outsider. But Naruto, with his determination, would start to prove himself by showing his ninja skills and his good heart.
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 he feels ostracized in Konoha. If for some reason the villagers still don't fully accept him despite his heroics, he could be lured by the idea of a fresh start in Iwa.