It could be a group of traveling merchants. They see Naruto as an orphan in need and take him in. Naruto would then learn about the trade routes, different cultures and languages as he travels with them. He could use this knowledge to broker peace deals between different regions in the ninja world later on in the story.
Maybe an old hermit who lives in the mountains outside Konoha adopts Naruto. The hermit could be a master of some long - forgotten ninjutsu. Under his tutelage, Naruto would learn these ancient techniques and use them to protect the land around the hermit's dwelling. He might also gain a deeper understanding of nature and chakra from the hermit.
One possible plot could be that Naruto is adopted by a powerful ninja from another village. This new family might train him in different techniques and he could grow up with a new perspective on the ninja world. Maybe he would form alliances with his new village against Konoha at first, but later realize the importance of unity among all villages.
Iruka Sensei could be a likely candidate. He already has a close bond with Naruto and cares for him deeply. Adopting Naruto would be a natural extension of that relationship, and he could provide Naruto with a stable home life and continue to mentor him in his ninja training.
A strong female ninja from a hidden village that was destroyed. She has a big heart and sees Naruto as a chance to start anew. She can teach Naruto her unique fighting style which is a blend of agility and powerful strikes.
The Hyuga clan could also be a possibility. Given their strong bloodline and their focus on family and tradition, they might adopt Naruto. They could teach him their Gentle Fist technique. And Naruto could use his unique energy and determination to perhaps improve or modify the technique in some way. Plus, he could help the Hyuga clan with any external threats they face due to their valuable Byakugan.
It could be the Hyuga clan. Since they are one of the most prominent clans in the Naruto universe and have a very regal and traditional way of life. They might see Naruto's strength and determination and decide to adopt him, especially if they think he can help protect their secrets and status within the ninja world.
He could make friends with a young herbalist. This person might live in the forest outside Konoha and know a great deal about medicinal plants. They could help Naruto when he gets injured during his travels and in return, Naruto could protect them from wild animals or other threats.
One possibility could be that Naruto leaves Konoha due to feeling ostracized still despite his efforts. He might start a new life in a small village on the outskirts. There, he could train in solitude, learning new jutsus that are unique to the local environment. He may also encounter new characters who help him see a different side of the ninja world, away from the politics and rigid structure of Konoha.
Jiraiya's old contacts from his travels could also become Naruto's allies. Jiraiya was well - known and had many friends and acquaintances. Naruto could seek out these people and they, out of respect for Jiraiya, might help Naruto. For example, some of the toads from Mount Myoboku could be on his side.
The traditionalist elders might oppose Naruto. They are used to the old ways of running Konoha and may see Naruto's takeover as a threat to their power and influence.
One possible reason could be fear. Naruto has the Nine - Tails within him, and some in Konoha might be too afraid of its power getting out of control. They may not fully trust Naruto to keep it in check.