Sometimes, the plot twist is that Stiles is actually in on the kidnapping in a way. Maybe he's trying to protect his friends from a greater danger by faking his own kidnapping. So all the while his friends are searching for him, he's actually on a secret mission of his own, which is revealed later in the story and makes for a really interesting read.
Well, sometimes in these types of fanfictions, a plot twist can be that Stiles finds out Gerard is related to him in some unexpected way. This could completely change the dynamic of their relationship. Maybe Gerard is his long - lost relative, and this revelation makes Gerard have second thoughts about his actions. Or, there could be a plot twist where the place where Stiles is kidnapped has some sort of magical property that either aids or hinders his escape. For instance, it could be a place that nullifies certain supernatural powers, making it more difficult for Stiles to use his usual means of getting out of trouble.
One common plot twist could be that the kidnapper is someone Allen thought was a friend all along. It adds a sense of betrayal and shock to the story.
In some fanfictions, a plot twist could be that Haruhi's kidnapping is part of a virtual reality game that she unknowingly entered. The 'kidnappers' are just players in the game who are trying to win by capturing her. Another common plot twist is that the kidnapper has a change of heart halfway through. They start to see Haruhi's good qualities and instead of harming her, they end up helping her. And sometimes, it could be that the kidnapping is a test set by a mysterious organization to see if Haruhi is worthy of some special task or knowledge.
A plot twist could also be that the kidnapping was all a set - up by someone they thought they could trust, like a former manager or a jealous rival in the music industry. This would add a layer of betrayal to the story. And sometimes, there might be a twist where the place they are being held has a secret passage or weak point that they find by accident, leading to their escape.
One interesting plot twist could be that the kidnapper turns out to be someone Stiles thought was a friend all along. Maybe it was a werewolf in disguise who had a hidden agenda against Stiles or his friends. Another could be that Stiles discovers he has some hidden power during the kidnapping that helps him either escape or turn the tables on his captors. For example, he might find out he can communicate with spirits who guide him to safety.
A great plot twist would be if Raven is kidnapped and taken to a place where she meets her long - lost family members, but they're the ones who kidnapped her because they need her help to fight against a common enemy, and they knew this was the only way to get her attention. Another plot twist could be that the kidnapper has a split personality, and one side is good and wants to free Raven, while the other side is evil and wants to keep her captive. And the last plot twist might be that Raven is kidnapped into a parallel universe where everything is different, and she has to find a way back while also dealing with the kidnapper in this strange new world.
One possible plot twist could be that the kidnapper is actually an ally in disguise, trying to protect Mario from a greater threat. For example, they might be taking him away from Bowser's clutches in a way that seems like a kidnapping but is really a rescue mission.
One plot twist could be that the kidnappers turn out to be working for someone Juvia thought was a friend. Another could be that Juvia has a hidden power that she discovers while being held captive, which helps her escape. Or perhaps the person who seems to be the main kidnapper is actually being blackmailed into doing it.
Well, a great plot twist might be that Ponyboy discovers the kidnappers are actually part of a secret society that has been observing him for a special reason. Maybe they think he has some hidden power or knowledge. Also, it could be that during the kidnapping, Ponyboy finds out that there is a traitor among his own group who helped the kidnappers. This would add a whole new layer of drama and mystery to the fanfiction.
A plot twist might be that Shawn was actually expecting to be kidnapped. He could have been working undercover on a case and let the kidnapper take him on purpose to get closer to the real bad guys. It could also turn out that the kidnapper is a deranged fan of Shawn's detective work. They kidnapped him not to harm him but to force him to solve a mystery that only they believe in. And there's the chance that the whole kidnapping is an elaborate illusion created by Shawn himself as part of a bigger plan to expose a criminal organization that has been one step ahead of the police for a long time.