There are several characters who could support Naruto in such a fanfiction. The Inuzuka clan might side with him, as they respect strength and Naruto has proven himself time and again. Shikamaru, being Naruto's friend and a smart strategist, would definitely offer his support. And perhaps some of the jonin who believe in Naruto's ideals and think the council is overstepping its bounds would also back him up in this fight.
I think some of the younger ninjas in the village would support Naruto. They look up to him as a role model. Also, those who have been helped by Naruto in the past, like the families of the villagers he saved. They would see that Naruto is fighting for what's right and would stand with him against the council. Additionally, some of the outcast ninjas who feel oppressed by the council's rules might also join Naruto.
In this kind of fanfiction, Naruto might face a tough battle against the council. Maybe he's fighting for his own beliefs or to protect his friends. He could use his signature jutsus like the Rasengan to take on the council members who may have their own political motives and powerful techniques.
His friends like Sasuke would most likely support him. Sasuke, having walked a long path of redemption, would see Naruto's vision of an empire as a way to finally achieve the peace they both have been longing for.
The villagers of the Land of Waves would surely support Naruto. They have suffered a great deal under Gato's rule, so they would see Naruto as their savior. Also, Sasuke might support Naruto. Even though they have their differences, Sasuke would recognize the need to stop someone as evil as Gato.
His closest friends like Sasuke would most likely support him. Sasuke, who has also seen the dark side of the shinobi world, would understand Naruto's reasons for rebellion. Also, Sakura, who has always been by Naruto's side, would be there to support him. Shikamaru, with his intelligence, might also see the need for change and back Naruto up.
His friends like Sasuke, Sakura, and Kakashi would surely support him. They have been through a lot together and know Naruto's good heart and leadership potential.
His friends like Sasuke could be his allies. Sasuke, despite his own complex journey, has a deep connection with Naruto. He would understand Naruto's need to fight against the council if they were being unjust. Also, Sakura, with her medical skills and growing strength as a ninja, would be a great asset. She could heal the team during any confrontations and also use her combat skills when necessary.
Sakura and Sasuke would likely be his allies. They have been through a lot with Naruto and would stand by him. Also, some of his old friends from the Hidden Leaf like Shikamaru and Kiba might join in. They have always supported Naruto in the past and would do the same in this situation.
One possible plotline could be that Naruto discovers some underhanded schemes the council has been planning against him. Maybe they are trying to limit his growth as a ninja because they fear his power. So, Naruto decides to fight back by gathering evidence of their wrongdoings and presenting it to the village elders who are not part of the corrupt council. This would be a way for him to expose them and regain the trust and freedom he deserves.
Sakura might support Naruto. She has always believed in Naruto and his ability to do the right thing. So when he becomes the leader of Root, she would see it as an opportunity for Naruto to bring positive change. She could offer her medical skills to help the Root members who may be injured during the transformation of the organization.
Sakura would probably support Naruto marrying Yakumo. She has grown to be a good friend of Naruto over the years. She knows Naruto's big heart and when she sees how much he cares for Yakumo, she would be on board. Shikamaru, despite his laziness, would also offer his support. He is perceptive and can tell that Naruto and Yakumo are good for each other.