One interesting plot twist could be that Itachi has a hidden motive that is actually to protect Sasuke from a greater threat. Maybe there's a powerful enemy that Itachi knows will target Sasuke, so he kidnaps him to keep him in a secret location and train him in secret. Another twist could be that Itachi is being controlled by some dark jutsu and he doesn't really want to kidnap Sasuke but has no choice. This could lead to a journey of Sasuke trying to break the control over Itachi. Also, it could be that Itachi kidnaps Sasuke to reveal some long - hidden family secrets that Sasuke needs to know in order to become stronger.
Well, a cool plot twist might be that Itachi's kidnapping of Sasuke is part of a test. It's a test set up by the spirit of their father or an ancient Uchiha ancestor. If Sasuke can overcome this 'kidnapping' and understand Itachi's true intentions, he will unlock a new level of power. Also, what if Itachi kidnaps Sasuke to introduce him to a different style of ninjutsu that is only known to a select few in the Uchiha clan? This could completely change Sasuke's perspective on his own abilities and his relationship with his brother.
One possible plot twist could be that the kidnappers are not who they seem. Maybe they are being controlled by an ancient evil force that wants to use Legolas for some dark ritual. Another twist could be that Legolas is kidnapped as a decoy to draw out his friends, and then the real target is revealed later. For example, the kidnappers might be after a powerful elven artifact that Legolas's friends possess.
A really unexpected plot twist could be that the kidnappers are actually the good guys in a convoluted way. Maybe they know of a prophecy that Sasuke and Sakura are fated to bring destruction, so they are trying to stop it. Another idea is that during the kidnapping, Sasuke and Sakura end up in a different dimension where they have to rely on each other in completely new ways. Plus, the motives of the kidnappers could be related to a secret that Sakura has been hiding about her family all along.
One possible plot twist could be that Sasuke was actually being controlled by an unknown enemy when he kidnapped Hinata. This enemy might be using Sasuke's power to get to Naruto through Hinata. Another twist could be that Hinata has some hidden power or knowledge that Sasuke's side needs, and the kidnapping is a way to extract that from her. Maybe it turns out that Hinata was expecting the kidnapping all along as part of a larger plan to infiltrate Sasuke's group and learn their true intentions.
One possible plot twist could be that Itachi has been mind - controlled to kidnap Sakura. Maybe an enemy of Konoha has a powerful jutsu that forces Itachi to do this against his will. Another twist could be that Itachi kidnaps Sakura as a means to protect her from a greater threat in the shinobi world that no one else is aware of yet. He might know that she has some sort of power or knowledge that makes her a target, and by kidnapping her, he can keep her safe in a hidden location.
One interesting plot twist could be that the kidnappers turn out to be working for an old enemy of Zuko's family. They initially thought it was just a random act of villainy, but as the story unfolds, they discover a deeper conspiracy aimed at destabilizing the Fire Nation. Another twist might be that Katara discovers she has a hidden power that she can use to help them escape, but using it comes with a great cost. Maybe it drains her life force or has some other negative consequence.
A possible plot twist is that the kidnapper is being controlled by an otherworldly force, and Mokuba discovers a way to break the control. For example, he might find a magical item within the kidnapping location. Another plot twist could be that Mokuba's kidnapping was part of a bigger scheme to frame Seto Kaiba for a crime he didn't commit. This would add a layer of drama as Seto has to race against time to clear his name and save his brother. Also, it could be that the kidnapper is actually Mokuba's long - lost relative who wants to reconnect in a very extreme way.
Maybe the Akatsuki members who kidnapped Naruto start to have second thoughts. Some of them might realize that Naruto is not just a tool for their goals. They could begin to see his value as a person and his potential to bring peace in a different way. This could lead to internal conflicts within the Akatsuki group.
One interesting plot twist could be that their different upbringings within the wizarding world lead to a complete role reversal. Harry, raised in the Malfoy family, might be more prejudiced at first, while Draco, having grown up with the Weasleys perhaps, could be more open - minded. This would shatter the initial expectations of their characters and lead to a complex exploration of nature versus nurture in the wizarding world.
One possible plot twist could be that Sasuke is not the real kidnapper. Maybe he has an evil clone or someone is framing him. Another could be that Sakura has a hidden power that she discovers during the kidnapping ordeal, which changes the power dynamic. For example, she might be able to communicate with a spirit that helps her escape.
One possible plot twist could be that Dabi forgets his hatred for his family. This would completely change his dynamic with his father, Endeavor. Instead of seeking revenge, he might start to question the reasons behind his former animosity. Maybe he'll even try to reconcile with his family members, which would shock everyone around him, especially those in the League of Villains who were counting on his vendetta to fuel their plans.