In a fanfic, Danzo's Hokage - like ambitions could be explored through his relationship with the other villages. He might be more aggressive in foreign relations, which could draw the ire of other ninja villages. Naruto, being the protagonist who wants peace, would then be in a difficult position. He would have to either oppose Danzo's warmongering or find a way to make him see the benefits of peace.
One idea could be a fanfic where Danzo actually manages to become Hokage through some underhanded means. Then Naruto has to find a way to expose his true nature and restore the rightful leadership to the village. Maybe he teams up with some of the other shinobi who were also suspicious of Danzo's actions all along.
Naruto's character would likely become more complex. Danzo's training methods are strict and often involve a certain ruthlessness. Naruto, used to more open - minded and friendly training from the likes of Jiraiya, would have to adapt. He might become more calculating and less impulsive, which could be both good and bad. Good in that he'd be a more strategic fighter, but bad in that he might lose some of his charm and spontaneity that his friends love him for.
It could also be due to Naruto's outcast status in the village initially. Danzo might think that banishing Naruto would be an easy decision as Naruto doesn't have many supporters at first. He might believe that by getting rid of Naruto, he can maintain the status quo in the village and prevent any disruptions that Naruto's presence might cause in the future.
One way could be through the power of his friends. Their memories and the bonds he has with them might be strong enough to break through. For example, Sasuke's presence could stir something in Naruto, making him question the false beliefs Danzo has implanted in his mind.
Shikamaru is another possibility. He is known for his strategic mind. As Hokage, he could use his intelligence to make wise decisions for the village. He may not have the brute strength of Naruto or Sasuke, but his ability to plan and analyze situations would be invaluable in leading Konoha.
If Naruto was Danzo's grandson, it would completely change the Naruto universe. Naruto's ideals of friendship and trust would be in direct conflict with Danzo's methods. Naruto might have been trained differently, perhaps more secretly and with a harsher edge. It could also lead to a different dynamic with the other characters. For example, Sasuke might view Naruto even more suspiciously as he had a connection to Danzo, who Sasuke hated. And the village might have treated Naruto differently too, either with more respect due to his relation to a powerful figure or with more fear because of Danzo's controversial reputation.
Sasuke could also be a possibility for the 6th Hokage in the fanfic. He has grown stronger over the years and his unique perspective on the ninja world could bring new ideas to the leadership of the Hidden Leaf. He might start off as a controversial choice but prove himself through his actions in protecting the village and making tough decisions.
The training could make Naruto more self - reliant. Danzo would probably push Naruto to rely on his own skills rather than always depending on his friends or the power of the Nine - Tails. This could lead to Naruto developing new techniques and strategies on his own. He'd grow as a ninja in a way that's different from his growth under other mentors, like Kakashi or Jiraiya. His confidence would also come from his own achievements in training rather than just his natural abilities.
The plot would likely revolve around Naruto bringing his own unique brand of leadership. He would try to bridge the gaps between different clans in the village. He might also start diplomatic missions to other villages personally. Since he has friends in other villages like Gaara, he could use those relationships to strengthen alliances. This would lead to a series of adventures where Naruto has to balance being Hokage and still being the hero who jumps into action when needed.
The plot could involve Naruto having a philosophical discussion with Danzo. Naruto, with his idealistic views of peace and friendship, might try to sway Danzo from his more ruthless ways. They could talk about power, sacrifice, and what it really means to be a shinobi. Naruto could also demand answers from Danzo about the secrets he's been hiding from the village.