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.
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.
In a fanfic where Danzo gives Naruto the Sharingan, it could lead to a very different Naruto. Naruto might gain new abilities and a new perspective on the Uchiha. He could potentially master the Sharingan quickly with his strong willpower, but he would also have to deal with the dark side of the Sharingan, like the curse of hatred that often comes with it.
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.
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.
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.
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.
It depends on the specific fanfic. Some authors might come up with this plot twist to explore different character motivations and conflicts. In others, it might not be the case at all.
In this fanfic, perhaps Naruto's godlike powers would be a result of Danzo's unorthodox training methods. Danzo could push Naruto to his limits, making him a force to be reckoned with. Naruto might also have to deal with the distrust of his friends at first, as they are suspicious of his association with Danzo.
One possible plot could be that Danzo, seeing Naruto's potential, decides to take him under his wing secretly. He could train Naruto in more underhanded and strategic ways compared to the normal ninja training. Naruto might initially resist but then start to see the value in learning different perspectives of being a ninja.