Maybe Tsunade kidnaps Naruto as a way to force him to master a new and powerful jutsu. She could be desperate to make him stronger in a short time, thinking that normal training methods are not enough. So, she takes him to a secluded place against his will to intensify his training.
It could be that Tsunade is under some sort of mind - control or false information. She kidnaps Naruto believing he is a threat to the village. However, as the story progresses, Naruto manages to break through to her real self and they figure out who is really behind the false information, leading to a new adventure to save the village from the real enemy.
One possible plot could be that Tsunade kidnaps Naruto because she believes an enemy is after him and she wants to keep him safe in a secret location. She might think that by taking him away from the village, she can train him without any distractions or threats.
One possibility could be that Minato was under some kind of mind - control spell. Maybe an enemy of Konoha managed to manipulate him into thinking that Naruto was in danger by being in the village. So, Minato kidnaps Naruto to take him to what he believes is a safer place. But as the story unfolds, Naruto tries to figure out what's wrong with his father and tries to break the spell on him.
Well, it could be that Anko has some secret motive. Maybe she's being controlled by an enemy force who wants to use Naruto for some dark purpose. So she kidnaps Naruto to deliver him to this force.
Perhaps Naruto is trying to protect Ino in a really extreme way. He could think that there are threats to her life that no one else is aware of. So, instead of talking to her or her friends about it, he decides to take matters into his own hands and kidnaps her to keep her safe in a secret location. But this would obviously cause a lot of chaos among the other characters in the Naruto universe.
Maybe in the fanfiction, Kushina kidnaps Naruto because she believes she can protect him better away from the Hidden Leaf Village. She thinks the village has become too dangerous for him. However, Naruto doesn't understand her intentions at first and struggles against her. As the story progresses, he realizes her love and the real reason behind her actions.
If Naruto was adopted by Tsunade in fanfiction, he would probably be exposed to a different set of values. Tsunade is a strong - willed and sometimes reckless woman. Naruto could pick up on her fearless attitude towards battle and also her more practical approach to leadership. Also, their relationship might change the power dynamics in the village a bit, as Naruto would be directly under Tsunade's wing.
One possible plot could be that Naruto snaps at Tsunade because she refuses to let him take on a dangerous mission. Naruto, being headstrong, believes he is ready but Tsunade, thinking of his safety, says no. This angers Naruto and he snaps, leading to a rift between them until they eventually come to understand each other's perspectives.
The plot could involve a mystery in the village. Strange things start happening, and Naruto, Sakura, and Tsunade have to work together to solve it. Along the way, they face various challenges, and their individual skills and teamwork are put to the test. They also learn more about each other's pasts and how it relates to the current mystery.
One possible plot could be that Naruto and Tsunade are on a dangerous mission together. During this mission, they face many challenges that force them to rely on each other deeply. This shared experience gradually makes them develop feelings for one another. For example, Naruto might be injured and Tsunade uses her medical skills to save him, which makes Naruto see her in a new light, not just as the Hokage but as a woman he could love.
Well, it could be about Naruto accidentally breaking something precious of Tsunade's, like a family heirloom. This might lead to a series of events where Tsunade is initially angry but then Naruto makes it up to her in some heroic way, perhaps by going on a difficult mission for her.
In this type of fanfiction, perhaps Naruto is exiled due to some false accusations. Maybe there's a misunderstanding about his power or some events he's involved in are misconstrued. Tsunade, as the Hokage, might feel pressured by the village elders or some political situation to exile Naruto.