Iruka - sensei would also be a supporter. He has been like a father figure to Naruto. He would trust Naruto's judgment in leading Root. He could even give Naruto some advice based on his own understanding of the village and its people, helping Naruto to better manage the Root members and integrate them into the village in a more positive way.
The members of Team 7, including Sasuke (if he has reconciled with Naruto), would support him. They know Naruto's strength and his kind heart. They would help Naruto in different ways, like Sasuke could use his skills in combat and intelligence gathering to assist Naruto in leading Root to a new direction, while Kakashi could offer his wisdom and experience in handling difficult situations.
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.
In a 'Naruto leader of root fanfiction', Naruto could be leading Root in a new mission. He decides to focus on protecting the innocent rather than just following the orders of the village blindly. He trains the Root members in his own way, emphasizing on the importance of emotions and bonds, which is very different from what Root was used to under Danzo.
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.
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.
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.
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.
His friends from Konoha would surely support him. Sasuke might be one of them, as they have reconciled and share a deep bond. Kakashi, with his wisdom and experience, would also be there to offer advice. And of course, the rest of the Konoha 11 would contribute in their own ways, whether it's through combat support or helping with the infrastructure of the new kingdom.
His friends like Sakura and Shikamaru would surely support him. Sakura, with her medical skills, could be an important part of his regime, providing healthcare for the ninjas. Shikamaru, being intelligent, could offer strategic advice. Also, the younger generation of ninjas who have been inspired by Naruto would be his strong supporters, as they believe in his leadership and the new direction he could take the village in.
Many of the Jinchuriki would probably support Naruto. Since he is also a Jinchuriki and has shown them respect and understanding, they would see his vision of a new country as a chance for a better life. They could use their unique powers to help in the construction and defense of the new country. For example, Gaara, who has a deep bond with Naruto, could use his sand - controlling abilities to build infrastructure in the new country.