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.
There might be a wandering swordsman. This character could be an expert in close - combat techniques that Naruto has never seen before. They bond over their shared love for combat and self - improvement. The swordsman could teach Naruto some unique skills that Naruto can incorporate into his own fighting style.
Perhaps Naruto would meet other jinchuriki in his travels around the world. They share a unique bond as they are all hosts of tailed beasts. Together, they could support each other, exchange experiences about living with the beasts inside them, and become great friends in the process.
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.
He could meet a young and talented ninja who has a different style of fighting. This new friend could teach Naruto some new moves.
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.
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.
Naruto could befriend Neville Longbottom. Neville has his own journey of growing stronger, and Naruto, with his immortality and vast experience, could inspire him further. Luna Lovegood might also be drawn to Naruto because of his other - worldly presence. She could find his ninja skills and his different way of life very interesting. And of course, the Weasley twins. They would be excited to learn about Naruto's pranks and ninja tricks, and might even collaborate with him on some new and crazy schemes at Hogwarts.
Gaara would be an obvious choice. Since Gaara is from Suna, he could be Naruto's close friend. They could train together and share their experiences of being jinchuriki. Kankuro and Temari might also become his friends. Kankuro could teach Naruto some of his puppet techniques, and Temari could help Naruto with wind - style jutsu training.
He could interact with Mei Terumi, the Mizukage. She might be initially cautious of Naruto but then see his potential and work with him. Also, Chojuro, as he is one of the important ninjas in Kiri. They could train together or go on missions side by side.
Sasuke could be involved. He might either try to stop Naruto from leaving, believing that they should face whatever comes together in Konoha, or he could decide to join Naruto on his journey, as they have a deep bond.
Naruto could potentially be allied with those who oppose the traditional power structure of the ninja world, not just limited to specific villages. There might be a group of ninja who believe in a more equal and just ninja world without the dominance of the big five villages. He could also form an alliance with some mysterious and powerful individuals who have their own agendas and see Naruto as a useful tool outside of the Konoha context.