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.
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.
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.
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.
Another aspect could be that the successor discovers some long - hidden secrets left by Danzo. These secrets could be related to powerful jutsu or ancient ninja lore. And as they uncover these secrets, they have to decide whether to use them for the good of the village or keep them buried to avoid causing chaos.
In such a fanfiction, Naruto might become a more shadowy and ruthless ninja. Danzo's training methods are often extreme and focused on loyalty to the village above all else. Naruto could lose some of his idealism and become more of a tool for Danzo's political games.
Well, if Naruto was trained by Danzo in fanfiction, it would be a huge departure from his normal growth. Naruto is all about hope and friendship. But under Danzo's tutelage, he could be molded into a more cynical shinobi. His jutsu might develop in different directions. For example, he could be pushed to learn more dangerous and morally ambiguous ninjutsu. Also, his relationships with his friends might change as he becomes more secretive and less open - hearted due to Danzo's influence.
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.
Yes, there are some. You can check on fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'godlike Naruto good Danzo' in their search bars and you'll likely find a few stories that match. However, the perception of 'good' can vary from person to person depending on their own understanding of the Naruto universe and the characters.