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.
Sasuke could be an ally. He also has his own issues with Konoha and would understand Naruto's need for revenge. They could combine their powers, with Naruto's massive chakra reserves and Sasuke's unique Sharingan abilities.
In a crossover scenario, Naruto could find allies in characters from other anime. For instance, if he enters the world of One Piece, Luffy and his crew could be his allies. They share the common trait of having big dreams and a strong sense of loyalty. Luffy would be drawn to Naruto's determination, and together they could face any challenges in this new world.
One possible ally could be Yamato. He has knowledge of the Wood Release and could help Naruto better understand and control his new power. Shikamaru might also become an ally. He is smart enough to see through the false accusations against Naruto. And there are the Akatsuki members who might have a change of heart. For example, Itachi's spirit could guide Naruto in some way, or Kisame could see Naruto's potential and side with him.
Sasuke could be an ally. Despite their past differences, Sasuke might see the injustice of Naruto's banishment and decide to join him. He could bring his powerful Sharingan skills to the new village. Also, some of Naruto's old friends like Shikamaru or Choji might secretly support him and provide resources or information. They could be like undercover allies still within the old village but helping Naruto's new village in various ways.
The other members of Team 7 like Sakura and Kakashi could also be his allies. Sakura could use her medical ninjutsu to heal any injuries Naruto and the team get in space battles. Kakashi could offer his wisdom and combat experience, guiding Naruto in this new and unfamiliar space - filled adventure.
Sasuke could potentially be an ally. Even though they have their differences, in the Akatsuki setting, they might realize they need to work together. Another could be Itachi. Itachi has his own motives and might see Naruto as a key to achieving certain goals within the Akatsuki. Also, Konan could be an ally. She seems to be more open - minded compared to some of the other members and might be swayed by Naruto's positive attitude.
Sasuke could be one of his allies. He might be a rival knight at first but then they realize they have to work together. Sakura could be a healer knight, always there to patch up Naruto and the others after battles. Kakashi could be a wise old knight who gives Naruto advice on knightly matters.
Naruto's allies could include not only his friends from Konoha but also some unexpected characters. Maybe Gaara, as the Kazekage, would form an alliance with Naruto's empire. Their shared experiences of being outcasts in the past could strengthen their bond. Hinata would also be by his side, offering her gentle support and her Byakugan abilities to help in matters of security and intelligence - gathering within the empire.
Sakura could be one of his allies. Even in a sorcerer - themed fanfiction, her medical skills could be translated into some sort of healing magic within the sorcerer world, and she would always be by Naruto's side.
In this fanfiction, Naruto might find allies among the shinobi who were also wrongly exiled from their own villages. They would share a common bond of being outcasts and would fight together against the system that exiled them. Additionally, there could be some rogue ninja with a sense of justice who believe in Naruto's cause and decide to stand by his side in the war.