There's a chance that Naruto meets some of the younger ninja in Kumo who are eager to test their skills against him. These young ninja could be his rivals at first but then become friends as they learn more about Naruto and his reasons for coming to Kumo.
Naruto could meet the Raikage in this fanfic. The Raikage, being the leader of Kumo, would surely take notice of Naruto's arrival. They might start off on a tense note, as Naruto is from a different village, but later develop an understanding.
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.
It could be that Naruto has some sort of conflict with the people in Konoha. For example, he might have been wrongly accused of something. So, he runs away to Kumo. In Kumo, he might meet new friends and allies who help him prove his innocence and also improve his ninja skills.
Naruto might meet some young and talented Kumo ninjas. They could be eager to test their skills against Naruto or learn from him. Maybe there are some unique characters like a Kumo ninja with a special bloodline limit that Naruto has never seen before.
He could meet some of Iwa's powerful ninjas. Maybe Onoki, who could either see him as a threat or an opportunity. There might also be some young Iwa ninjas who are curious about Naruto and his abilities.
He might meet some of his distant Uzumaki relatives. There could be elders or other Uzumaki clan members who have valuable knowledge about his family and their special abilities.
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 other rogue ninjas. These are ninjas who have left their villages for various reasons, and they might be on a similar journey as Naruto. They could either help him or try to take advantage of his situation.
He would surely meet Gaara. Gaara has had his own struggles and he might be able to understand Naruto on a deeper level. They could form an even stronger bond than before, with Gaara helping Naruto hide from those who might be looking for him in Suna.
He could meet the Raikage. The Raikage might be initially skeptical of Naruto but could later see his potential. There are also other strong ninjas in Kumo like Killer Bee. Naruto might cross paths with him and they could have some interesting interactions, perhaps even training together.
He might meet the leader of Amegakure. Naruto could also come across some skilled shinobi who are masters of rain - based jutsu.