Well, one possible plot could be Naruto growing up under Danzo's influence. He might be trained in more underhanded and secretive shinobi techniques. For example, he could be taught to prioritize the village's security above all else, even if it means using morally gray methods. This would put him at odds with some of his friends who follow more traditional ninja values.
His personality would likely be more reserved and calculating. Since Danzo was a very secretive and shrewd character, Naruto might inherit some of those traits. He may not be as open and trusting as in the original series.
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.
Well, one possibility could be that Naruto grows up with Danzo's strict and secretive ways. He might be trained in more underhanded ninja techniques. But at the same time, he could inherit Danzo's sense of loyalty to the village, though in a more extreme form. Maybe he'd struggle to balance the dark side of Danzo's teachings with his own desire for friendship and acceptance, which was a big part of his character in the original series.
Naruto might become more of an isolationist. Danzo was not one to form close bonds easily. So Naruto could be more reserved and keep to himself. However, his natural urge for connection might still be there, and he'd struggle between his upbringing and his true nature. He could start off as a loner but gradually learn to open up as he experiences different things in the village and realizes that not all relationships are like the ones Danzo had.
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.
One way Naruto could be like Danzo in fanfiction is through their view on secrecy. Danzo was big on keeping secrets and operating in the shadows. A fanfic could write Naruto into a scenario where he has to keep important information from his friends, believing it's for their protection, much like Danzo did. This would be a huge departure from his normal open and honest self.
A great fanfiction is 'Danzo's True Legacy in Root'. It portrays Danzo in a more sympathetic light. It tells the story of how Root was originally founded to protect the village from threats that the regular shinobi forces couldn't handle. And Naruto, through his own journey of understanding the darker side of the village, comes to realize that there was some good in what Danzo was trying to do, and he helps to reshape Root into a more positive force.
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.