In this fanfiction plot, Theo kidnaps Lydia because he believes she can help him get revenge on someone. He takes her to a secluded location. Lydia is angry as well as frightened. She starts to play mind games with Theo, using her intelligence. Theo is taken aback by her resilience. As they interact more, Theo starts to see Lydia not just as a means to an end but as a person. This change in his perception makes him question his actions. At the same time, Lydia is constantly looking for an opportunity to send a signal to her friends so that they can come and rescue her.
One possible plot could be that Beetlejuice kidnaps Lydia to force her to help him gain more power in the afterlife. Maybe he thinks her unique connection to the living and the dead makes her a valuable asset.
It could also be an unseen force controlling Theo. In this case, the real antagonist is this hidden entity that uses Theo to kidnap Lydia. The story could then be about Lydia and her friends not only rescuing her from Theo but also uncovering and defeating this greater threat.
Title: 'The Abduction of Lydia by Theo'. In this fanfiction, Theo might have his reasons for kidnapping Lydia. Maybe he believes she holds the key to some power or knowledge he desperately wants. He could be a complex character, not entirely evil, but driven by his own motives. Lydia, on the other hand, would be a strong - willed victim. She'd use her wits to try and outsmart Theo, leading to a tense cat - and - mouse game throughout the story.
Lydia would probably be very scared at first. After all, being kidnapped by a strange and unpredictable character like Beetlejuice is no joke.
It could also be for power. Perhaps Stiles has some knowledge or ability that Theo wants to use for his own gain. In the show, Stiles was quite smart and resourceful, so Theo might kidnap him to get access to that intelligence or those skills. In some fanfictions, Theo might be trying to use Stiles as a bargaining chip to get something from the other characters like Scott or Derek.
Another plot could be that Theo kidnaps Lydia as a way to get back at the McCall Pack. Since Lydia is an important member of the pack, taking her would be a major blow. As she's held captive, Lydia discovers Theo's deeper motives which are related to some past event involving her friends. This could lead to a tense stand - off when the pack comes to rescue her.
Well, it could be that Nico has some dark plan. Maybe he believes Percy is the key to saving someone he loves in the Underworld. He might think that by kidnapping Percy, he can force Percy to use his powers to bring that person back to life or something like that.
The Bratva might kidnap Felicity because they think she has some valuable information. Maybe she's a tech genius and they believe she can decrypt some files that are important for their illegal business. So they snatch her away, and then Felicity has to use her wits to either escape on her own or leave clues for her friends to find her.
Well, maybe Demando kidnaps Usagi because he wants to use her power for his own evil plans. He might keep her in a dark, hidden lair. Usagi would be really scared at first, but then she could start to think of a way to escape using her own powers and the power of friendship. For example, she could try to send a psychic message to her friends if she has such powers in this fanfic scenario.
One possible plot could be that the other characters, like Harry and Ron, immediately start a rescue mission. They might search for clues about where Dolohov has taken Hermione. Maybe they discover that Dolohov is working for a more powerful dark wizard who wants Hermione for her knowledge of magic. Then they have to face various traps and dark spells to reach her.