It could be Killer Bee. He's a very well - known and powerful ninja from Kumo. His unique fighting style and his status as a Jinchuriki would make him a great candidate to be the one who saves Naruto.
Naruto would probably use his friendly and outgoing nature to adapt. He'd start by getting to know the people around him, like his new family and the local ninjas. He might also be interested in Kumo's unique jutsu and training methods, which would help him fit in. And of course, he'd keep his goal of promoting peace between Konoha and Kumo in mind, which would give him the motivation to overcome any difficulties in adapting.
Maybe he's running away from some kind of danger or threat in his home village. There could be a group or an individual after him, and he believes that Kumo would be a safer place. It could also be related to some political unrest in Konoha that makes him feel like he has to leave, and Kumo seems like a viable option.
Well, in fanfiction, one way could be that some Kumo ninjas are given the Sharingan as a gift or a curse from an ancient being. They then start to form a special group within the village dedicated to understanding and mastering the Sharingan. This group would share their knowledge with others, and over time, the Sharingan becomes an important part of Kumo's ninja heritage, with its own set of training methods and traditions.
Yes, in fanfiction, anything can be possible. Writers can create alternate universes where Naruto is born in Kumo instead of Konoha. They can come up with various reasons for this change, like a mission that led his parents to Kumo before his birth or some sort of political arrangement.
Adapting to a new ninja system could be a big challenge. Kumo may have different training methods, rules, and traditions compared to his home village. Naruto would need to learn and adjust quickly if he wants to survive there.
He could meet some rogue ninjas. These ninjas might either try to harm him or, in some cases, offer to help him on his journey. They might have their own reasons for being in the area between Konoha and Kumo.
One common theme is identity. Since Naruto is from Konoha originally, becoming a Kumo Shinobi makes him question who he really is. Another theme is adaptation. He has to adapt to new training methods, new comrades, and a different village culture in Kumogakure.
Power and growth are common themes. Kumo ninjas are often depicted as striving to become more powerful, both physically and in terms of their ninja skills.
If Naruto joins Kumo in fanfiction, it might start with Naruto being sent on a mission to Kumo as an ambassador of sorts. Once there, he becomes intrigued by their combat techniques and decides to stay for a while to train. He could get involved in Kumo's internal power struggles. For example, there might be a faction in Kumo that doesn't trust him and tries to drive him out, while another faction sees his potential and wants to keep him. His presence could also change the dynamics between Kumo and other ninja villages as they see Naruto's new allegiance.