One idea could be that Danzo is transported to an alternate universe where he has to team up with a version of himself from that world to stop a common enemy. This would force him to confront his own actions and motives in a new light.
Naruto himself would be an interesting addition. His ideals of friendship and forgiveness could be in direct contrast to Danzo's more underhanded and secretive ways. It would create a lot of tension and potential for character growth for both of them.
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.
Well, 'A Day in the Life of Shimura' is a unique 'Naruto Shimura' fanfic. It gives readers a peek into Shimura's daily routine, his training methods, and his interactions with other characters. 'Shimura's Secret Training' is another interesting one. It shows how Shimura hones his skills in secrecy and how this new - found strength helps him in crucial battles. Also, 'The Shimura Family Tree' fanfic explores Shimura's family heritage and how it has shaped his character and abilities.
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.