Some of the lesser - known Ame ninjas who are tired of the constant conflict. They might see Naruto as a symbol of change and ally with him. These ninjas could have unique skills that Naruto can learn from, and together they can work towards a more positive future for Ame.
One possible plot could be that Naruto goes to the Hidden Rain Village (Ame) seeking refuge or on a diplomatic mission. There, he discovers a new side of the ninja world, with different fighting styles and political intrigues. He might form alliances with some of the local ninjas and help them face a common enemy, perhaps an old foe that is threatening both Konoha and Ame.
Ichigo would most likely be one of his allies. Ichigo is the main protagonist in Bleach and has a strong sense of justice, just like Naruto. They would understand each other well and fight side by side.
Definitely the Na'vi. They are the native inhabitants of Pandora and would likely see Naruto as an ally, especially if he shows respect for their land and culture. His skills could be useful to them in their fight against any common enemies.
Sasuke could be one of his main allies. Despite their past differences, they could put aside their issues to support Naruto in his role as the King of Monsters. Sasuke's powerful combat skills would be a great asset in battles against those who oppose Naruto.
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.
Rock Lee could be an important ally as well. His unwavering determination and physical strength would be useful for the heavy - lifting tasks involved in building the village, like constructing buildings and fortifications. Also, his positive attitude would inspire the other villagers to work hard towards making the new village a success.