One possible reason could be a threat from Iwa to Konoha. If Iwa was planning an unprovoked attack on Konoha, Naruto might take it upon himself to destroy Iwa to protect his village.
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.
A young and talented Iwa ninja who feels left out could be the main character. He or she might be frustrated with how their village is always in the shadow compared to Konoha and wants to change that perception.
Maybe in the 'naruto neglected iwa fanfiction', there's a story where Iwa has a secret technique that could have been useful in the great ninja wars, but because they are neglected, they are not invited to share this knowledge. As a result, a young Iwa ninja goes on a journey to find a way to make the other villages recognize their worth and the importance of their techniques.
Another theme is the idea of duty vs. personal feelings. The characters are often in the arranged marriage for the sake of their villages' alliances. So they have to balance their duty to their villages with their own growing personal feelings for each other. This creates a lot of internal conflict and drama.
There might be characters from Iwa who oppose Naruto. For example, the Tsuchikage of Iwa would surely be involved as the leader of the village Naruto is attacking.
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.
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 popular 'Naruto Iwa arranged marriage fanfiction' is 'The Stone's Bride'. It delves into the complex relationship between a character from Konoha and an Iwa-nin due to an arranged marriage. The story is filled with cultural clashes and the slow - building of an unexpected bond.
His character might be more rough - around - the - edges. Iwa has a harsher environment, so Naruto could be less of an idealist compared to his Konoha self. He might be more focused on survival and power - grabbing in the early days.