One plot development could be that Harry is kidnapped by the Order and taken to a hidden location. There, he meets other characters who are also being protected or held against their will. Together, they form an alliance within the Order's captivity and plan an escape. Meanwhile, the main members of the Order are arguing about what to do with Harry. Some want to let him go, while others think they should keep him there until they can be sure he's not a threat. This internal conflict could lead to a split in the Order, with Harry in the middle of it all.
In this fanfiction, perhaps Harry is kidnapped by the Order because they think he's being influenced by dark forces. As the story unfolds, he could start to understand their reasons while also uncovering a traitor within the Order who wants to harm him for real. Or, he might use his skills to turn the situation around and make the Order see that they were wrong to kidnap him in the first place. He could then lead them in a new direction against Voldemort.
Well, one possible plot development could be that the kidnappers demand a ransom from Batman. Batman then has to race against time to find Robin without alerting the media or causing panic in Gotham. Another development might be that Robin manages to leave some hidden clues for Batman to find while being held captive. Maybe he uses his martial arts skills to briefly overpower one of the kidnappers and mark a symbol on the wall that only Batman would understand.
Well, one possible plot development could be that his friends start a rescue mission right away. They might use magic to track the vampire's lair. For example, Hermione could use her extensive knowledge of spells to create a tracking charm. Another development could be that Harry discovers some hidden power within himself while being held captive, something that he can use to either escape or fight the vampire when the time comes. Maybe he has some latent ability related to his connection with Voldemort that can be used against the vampire's dark magic.
One possibility is that Naruto's friends launch a rescue mission. They would use their unique skills, like Sasuke's Sharingan or Sakura's medical ninjutsu combined with her combat skills, to find and save Naruto.
One possible plot development could be that his friends immediately launch a rescue mission. They might use their unique skills and resources to track down the kidnappers. For example, if Obi - Wan is involved, he could use his Jedi mind tricks to interrogate possible informants in the underworld.
In some 'Harry Kidnapped by Pettigrew' fanfictions, one interesting plot development could be Harry's struggle to escape. He might use his wits and the little magic he can muster in captivity. For example, he could try to communicate with his friends through magical means that Pettigrew doesn't suspect. Another aspect could be Pettigrew's motives. Maybe he's being blackmailed by some dark forces to kidnap Harry, which adds a layer of complexity to the story.
One possible plot development could be that Duke's friends in the Bat - family immediately start a search operation. They might use their various skills and resources to track down the kidnappers. For example, Batman could analyze the crime scene for any clues while Robin tries to hack into security cameras in the area.
Well, one plot development could be that Hiccup uses his wits to escape. He might study the dragon's behavior while captive and find a weakness to exploit. For example, if the dragon has a particular routine when it leaves the lair to hunt, Hiccup could use that time to make his escape.
Well, it could be that Kate has some ulterior motives for kidnapping Stiles other than just causing trouble for the pack. Maybe she thinks Stiles has some knowledge about a powerful supernatural artifact or a secret that could help her in her own goals. As the story progresses, Stiles could start to form a strange sort of bond with Kate, not a friendly one but more of an understanding of her twisted mindset, which could add a whole new layer to the plot.
Well, perhaps in the fanfiction, Sakura is kidnapped by Sasuke because he wants to use her as a bargaining chip against Konoha. Then, the story could involve the other Konoha ninjas coming together to strategize a rescue mission. They might have to deal with Sasuke's new and powerful abilities that he has acquired during his time away. Sakura, while kidnapped, could also try to talk some sense into Sasuke, appealing to their past friendship and her feelings for him.
One possible plot development could be that Harry discovers new magical abilities or knowledge within the Greengrass family. Maybe they have a unique magical heritage that helps him in his fight against Voldemort.