Well, sometimes the plot twist is that the reader has a past with Bucky that they've forgotten. Maybe they were once friends or allies in a previous life or a forgotten mission. This forgotten past then starts to resurface during the kidnapping situation. Or, there could be a twist where Bucky kidnaps the reader thinking they are someone else who is a threat, but then realizes his mistake and has to deal with the consequences of his actions, like trying to keep the reader safe from the real threat while also making amends for the false kidnapping.
One common plot twist could be that the reader turns out to have a hidden power or connection. For example, they might be related to a powerful figure in the Marvel universe. Another twist could be that Bucky has been brainwashed by an unseen force to kidnap the reader, and as the story unfolds, he starts to fight against that control. Also, the reader might find out that Bucky's kidnapping was actually a misdirected attempt to protect them from a greater threat that he knows about but the reader doesn't.
The relationship could develop into an unlikely friendship. As the reader gets to know Bucky better during the captivity, they might start to see his good side and he might start to respect the reader's strength and resilience. For example, they could start having conversations that make them realize they have more in common than they thought.
Another plot twist could be that the reader has some sort of power or knowledge that Loki needs. So, instead of a malicious kidnapping, it's more of a strategic move on Loki's part. He might be trying to bargain with the reader to get what he wants, but as time passes, he starts to develop feelings for the reader.
Well, perhaps the plot of the fanfiction where Sasuke kidnaps the reader could involve a misunderstanding. Sasuke might think the reader is working for his enemies when in fact they are not. As for the story development, it could lead to the reader gradually understanding Sasuke's past traumas and reasons for his actions, and in the end, they might even help him heal some of his emotional wounds. And there could be a lot of action scenes where the reader tries to escape but then realizes that Sasuke is not really a bad guy in this situation.
One common plot twist could be that Dabi has a hidden motive other than just kidnapping Shouto. Maybe he's being controlled by a greater villain. Another could be that Shouto has some hidden power that he discovers during the kidnapping ordeal. For example, he might find a new way to control his fire and ice powers to escape.
In this fanfiction scenario, Snape might be under the influence of a dark spell or some form of blackmail. He kidnaps Harry as a result. However, Harry, being the resourceful character he is, might start to figure out Snape's true situation and try to help him break free from whatever is controlling him.
In this fanfiction, it could be that Loki was misled into thinking the girl was an enemy spy. So, he kidnaps her to interrogate her. However, during the interrogation, he discovers she's completely innocent. Now, he has to figure out how to make up for his mistake without losing his pride, and also deal with the potential chaos that his hasty action has caused among her friends and family.
A common plot twist is that Hermione actually has a hidden power or ability that she reveals during her captivity. For example, she might be able to use a type of magic that Draco and his associates didn't expect, which gives her an upper hand in the situation. This could lead to a change in their relationship dynamic, from captor - captive to something more like equals.
Often, a plot twist is that one of the twins is actually in on the kidnapping for some self - serving reason. This could be to gain attention or to get a share of a large inheritance. It completely changes the dynamic as the other twin has to deal with the betrayal on top of the kidnapping situation. It also adds an element of mystery as to why the twin would do such a thing.
One possible plot twist could be that Bumblebee has a hidden power that he discovers while in captivity. For example, he might be able to communicate with an ancient Cybertronian force that helps him break free. Another could be that Megatron has a secret reason for kidnapping Bumblebee that has to do with an old prophecy. Maybe Bumblebee is the key to unlocking a great power that Megatron wants for himself. A third plot twist might be that Bumblebee's friends think he's been kidnapped, but in reality he went with Megatron willingly to spy on him, only to find himself in a real bind when Megatron discovers his true intentions.
Well, perhaps a plot twist could be that Percy's friends think he's been kidnapped by someone else entirely. So they're looking in all the wrong places while Khione has him hidden away. Or, it could be that Khione kidnaps Percy but then realizes she's made a huge mistake because Percy has some sort of connection to a force that can destroy her. So she has to figure out a way to either let him go or use him to her advantage in a different way. Also, what if Percy is able to communicate with the elements in Khione's domain and he uses that to his advantage to escape or gain the upper hand?