One interesting plot could be a powerful villain using a unique jutsu to brainwash Naruto himself. This would turn the tables as Naruto, usually the hero, starts acting against his friends. For example, he might try to stop Sasuke from leaving the village for the wrong reasons, but while brainwashed, he could be used to drive Sasuke further away.
In some 'naruto characters brainwashed fanfic', there could be a plot where multiple characters are brainwashed at once. Like if Orochimaru managed to brainwash a group of Konoha ninjas. They would then start causing chaos within the village, and it would be up to the unaffected characters like Kakashi to figure out what's going on and how to reverse the brainwashing. It would create a lot of tension and interesting battles within the village.
Naruto is a likely candidate. Given his importance in the series, a plot where he is brainwashed can create a huge impact. His powerful chakra and his role as the main character mean that if he is brainwashed, it can change the entire dynamic of the story. The enemy could use his strength against his own friends and village.
In some fanfictions, Naruto is brainwashed to believe he is from another village. So he starts working for their goals. This could lead to a lot of interesting interactions as he clashes with his former comrades. The story might explore how he slowly starts to remember his true identity through small flashbacks and the bonds he has with his friends.
One possible plot could be Voldemort brainwashing Harry to turn against his friends at Hogwarts. Harry might start acting strangely, like isolating himself from Ron and Hermione. Another plot could involve Voldemort using the brainwashed Harry to steal important magical artifacts from the school. Maybe Harry is made to believe that these artifacts are rightfully Voldemort's and that he's on a noble mission.
One possible plot could be Hawkeye being brainwashed to target his own teammates. He might start by infiltrating the Avengers' base under the mind control. Another plot could involve Hawkeye being used to steal important artifacts from the Avengers, all while believing he's doing the right thing due to the brainwashing. For example, he could be sent to retrieve Thor's hammer, which would create a huge conflict within the team as they try to figure out what's wrong with him without harming him.
Well, without actually reading the fanfic, it's hard to say exactly. But generally, it might be about Kushina being brainwashed in a Naruto - related fictional scenario. It could involve changes in her relationships, her role in the Naruto world, or how her actions impact other characters.
One interesting plot could be two Narutos from different timelines meeting. They could exchange stories about their battles and growth, and then team up to face a new, powerful enemy that neither could defeat alone.
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.
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.
Well, in some fanfics, Naruto might use his shadow clones to create a distraction and then slip away. Maybe he's on a mission he deems more important than staying in the hospital.
One interesting plot could be a jounin who has a secret mission to infiltrate an enemy village. He has to use his unique jutsu and skills to avoid detection. Another plot might involve a jounin training a group of genin in a very unorthodox way that challenges the traditional shinobi training methods.