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.
Well, the village would likely be a much more positive place. Naruto is all about friendship and believing in others. He would encourage the ninja in the village to be more open and cooperative. The Hidden Leaf would probably see a rise in morale, with more people feeling included and valued.
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.
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.
He'll likely lose his power and influence in the village. Once Naruto reveals his secrets, the villagers won't trust him anymore. His actions might be put on trial, and he could be exiled from the village.
One possible motive could be to gain control over Naruto's power. Since Naruto has the Nine - Tails within him, Danzo might want to use that power for his own political or military gains. He's always been power - hungry and sees Naruto as a tool to achieve his goals of making Konoha stronger in his own way, which might involve more underhanded and controlling methods.
It could also be a completely new character introduced into the fanfiction. A foreign ninja who was inspired by some of Danzo's ideas (not the bad ones) and comes to Konoha to take on the role of successor, bringing in new perspectives and ways of doing things.
One possible motive could be revenge. Maybe the oc or someone close to the oc has been wronged by Danzo in the past. So, to seek justice, the oc decides to take him down.
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.
Well, in some versions, Naruto might use his influence among the villagers. After Pain's attack, the village is in a state of rebuilding and re - evaluating. Naruto, being a hero, has the ears of the people. He could start by presenting evidence of Danzo's underhanded deals, like his connection to Orochimaru perhaps. Maybe he found some secret documents during the chaos that Pain caused, which link Danzo to unethical experiments or power - grabbing within the village.