Well, one possible plot twist could be that Kohana has a hidden motive that's not as evil as it seems at first. Maybe she's being controlled by a greater force and Naruto realizes this and tries to save her instead of just escaping. Another could be that Kohana is actually from a long - lost clan that has a prophecy related to Naruto, and the 'kidnapping' is a way to start fulfilling that prophecy.
A plot twist could be that Kohana kidnaps Naruto but then they end up in a strange dimension where they have to work together to get out. During this time, Kohana reveals that she was trying to protect Naruto from a real threat in the ninja world that she knew about but couldn't explain in the normal way. So, the 'kidnapping' was more of a forced rescue mission.
One possible plot twist could be that the 'Uzumaki' who kidnaps Naruto is actually an impostor. Maybe it's someone with shape - shifting abilities who wants to use Naruto for some dark purpose. For example, they could be trying to extract the Nine - Tails' chakra from Naruto in a more brutal way than the Akatsuki ever planned.
Naruto would probably first try to fight back. He's not the type to just go along with being kidnapped. He'd likely use his Shadow Clone Jutsu to create a distraction and try to escape.
It could be that Fem Sasuke is under some sort of mind - control when she kidnaps Naruto. A powerful enemy, like Orochimaru or a new villain, might have used a jutsu to make her do this. As the story progresses, Naruto would then have to find a way to break the mind - control on Fem Sasuke while also dealing with the situation of being kidnapped.
One possible plot twist could be that Sakura has been secretly training a new jutsu and uses it to outwit Orochimaru at the last moment. For example, she might have developed a genjutsu that can counter Orochimaru's mind - control techniques. Another twist could be that Naruto and Sasuke arrive just in time, but instead of a straightforward rescue, they find that Sakura has made a deal with Orochimaru in order to gain some powerful knowledge. This could lead to a rift between her and her teammates.
Perhaps Kai kidnaps Elena to force her to help him with something. He might need her doppelganger blood to break a curse on himself or his family. In the process, Elena discovers a side of Kai that she didn't expect, and they form an unlikely alliance against a common enemy that emerges during the ordeal.
Well, perhaps the plot could involve Hermione actually getting through to Tom Riddle in some way. Since she's so intelligent and empathetic, she might start to make him question his dark ways while being kidnapped. This could lead to a really interesting internal struggle within Tom. Also, there could be a twist where the kidnapping is part of a much larger plan that involves other dark wizards or witches, and Hermione has to figure out how to not only escape but also stop this bigger conspiracy. Or it could be that Hermione discovers a secret about Tom Riddle's past during her captivity that she can use to her advantage.
Perhaps the real reason behind the kidnapping has to do with a secret Pokemon that Whitney has. It could be a legendary Pokemon that she's protecting, and the kidnappers want to use it for their own evil purposes. And then, when the rescuers think they've found Whitney, it turns out to be a decoy set up by the kidnappers.
A common plot twist is that the kidnapped person turns out to have a hidden power or knowledge that Zuko needs. For example, they might know a secret about his family or a powerful bending technique.
In this fanfic, perhaps Madara kidnaps Naruto because he sees Naruto as a threat to his grand scheme. He figures if he can keep Naruto out of the way, his plans to reshape the ninja world will go more smoothly. Madara could then try to brainwash Naruto or turn him against his friends and village. For example, he might show Naruto the so - called 'truth' about the ninja world's history in a twisted way to make Naruto question his loyalties.
Maybe a plot twist could involve their family history. There could be a hidden enemy that targeted their family long ago, and now they have to face this threat together. As they dig deeper into their past, they find out secrets that change their view of themselves and their powers. It could also be that their brotherhood is a key to unlocking an ancient prophecy.