If Naruto were brainwashed by Danzo in a fanfic, he'd probably start following Danzo's extreme ideology. Danzo was known for his underhanded methods, so Naruto could be influenced to do things like suppress certain clans or individuals. His personality would change drastically. Instead of being the optimistic and friendly Naruto we know, he'd become cold and calculating, much like how Danzo was. This would be a huge shock to the other characters in the Naruto universe.
Well, in such a fanfic, Naruto might turn against his friends. He could be made to use his power for Danzo's often shady purposes. For example, he might be forced to target those Danzo sees as threats to Konoha in a more brutal way than he normally would. His relationships would be severely damaged as his friends would be confused and likely try to stop him, not realizing he's been brainwashed at first.
In a fanfic where Naruto is brainwashed by Danzo, it could lead to a dark turn in the story. Naruto's actions would no longer be guided by his own beliefs of friendship and protecting everyone. He might be used to eliminate opposition within Konoha. His friends, like Sasuke and Sakura, would surely try to break the brainwashing. They'd have to face a Naruto who has all his power but is being misdirected. It could create a lot of conflict, both internal within Naruto as he struggles against the brainwashing subconsciously, and external as his friends fight to save him.
Well, if Naruto was trained by Danzo, he might be more ruthless at first. But joining Team 7 could soften him up. He'd probably bring some of Danzo's combat techniques and secrecy to the team. It could make for an interesting dynamic, with Naruto being a bit more of an enigma compared to his canon self.
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.
In a Naruto fanfic where Mikoto is brainwashed, she could be made to do things against her normal nature. For example, she might be forced to fight against her friends or family. Maybe she'll be used as a tool by the villains in the fanfic's plot to gain some advantage over the other characters. It really depends on the creativity of the fanfic writer.
Naruto would become much more powerful. The Sharingan could give him an edge in battles, allowing him to copy jutsu more easily. He might be able to use it to analyze his opponents faster. However, he would also have to deal with the negative aspects of the Sharingan, such as the potential strain on his eyes and the risk of overusing it.
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.
Well, it really depends on how the fanfic is written. If the fanfic focuses on Naruto's weaknesses and Danzo's preparedness, Danzo could potentially win. He has a lot of political power and experience. However, if it follows the general power scale of the Naruto universe, Naruto has a better chance. His positive energy and the power of friendship (a bit cheesy but true in Naruto's world) often help him overcome his opponents. Naruto also has the ability to quickly adapt to new situations, which would be a big plus against Danzo.
Most likely Danzo would be seen as the main antagonist. His actions throughout the Naruto series were often self - serving and harmful to others, like his role in the Uchiha massacre. So when Naruto talks to him, he would be the one Naruto has to oppose or at least try to change.
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.
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.