Well, in Kumo, Naruto might face challenges related to power struggles. There could be certain groups or individuals in Kumo who see Naruto as a threat to their own influence. He's a powerful ninja from Konoha, and some in Kumo might not want him to gain too much power or popularity there. Another biggie is making new friends. It's not easy to break into an established social circle in a new village, and Naruto might find it hard to find people he can really trust and rely on.
He might meet a young and idealistic ninja in Kumo. This ninja could show Naruto a different way of looking at the ninja world. Maybe this Kumo ninja has a more peaceful approach to resolving conflicts, which makes Naruto re - evaluate his own views on fighting and rivalry between villages.
One possible reason could be a mission. Maybe the Hidden Cloud Village (Kumo) requests Naruto's help specifically for a very important and dangerous mission that can only be accomplished by him. So, he has to leave Konoha for Kumo.
The journey itself could be full of danger. There could be bandits or rogue ninja along the way who target Naruto because of his fame. Also, the terrain between Konoha and Kumo might be difficult to traverse, with mountains, rivers, and forests full of wild animals.
His relationships would become very complex. His friends in Konoha would be in shock. Naruto leaving Konoha for Kumo is like a slap in the face to them. They would wonder what drove him to such a decision. For example, Naruto had such a strong bond with Iruka - his first mentor. Iruka would be deeply saddened and would question if he had failed Naruto in some way. And Naruto's relationship with Kakashi would also take a hit. Kakashi would be worried about what this means for the future and how it could potentially lead to conflict between Konoha and Kumo.
He might gain unique lightning - based jutsu training in Kumo. Since Kumo is known for its strong lightning - style ninjas. Also, he could develop a new form of Rasengan that incorporates lightning chakra, which he may not have had the opportunity to do in Konoha.
Konoha would initially be in shock. Naruto is a hero to many in the village, and his sudden departure with Itachi, who was once considered a traitor, would cause a lot of unrest. The villagers might start to question the leadership of the village, wondering why Naruto left and if there was something they could have done to prevent it.
Another reason could be that he witnesses corruption or unfairness within the village leadership. If he sees that the system is rigged against certain groups, including himself or his friends, he could grow to hate Konoha and decide to leave.
Well, in this fanfiction scenario, Naruto might be betrayed by Konoha due to the long - standing distrust of the Nine - Tails within him. When he joins Kumo, he could be used as a weapon against Konoha at first. However, Naruto being Naruto, he would try to change the Kumo way from within. He'd show them that power isn't everything and that friendship and loyalty are important too. This could lead to a change in Kumo's attitude towards Konoha and even start a new era of cooperation between the two villages.
One possible reason could be to seek stronger opponents outside of Konoha. Naruto might feel that he has outgrown the training opportunities in the village and wants to face greater challenges.