Perhaps Hinata is kidnapped because she has some unique power or knowledge that the kidnappers want. In the fanfiction, the story could focus on how she uses her wits and hidden strength to try to escape while her comrades search for her. For example, she might be able to communicate with a small animal in the cell she's held in and use it to send messages.
It could be a rogue ninja who has a grudge against Hinata's clan. Maybe this ninja was once rejected by the clan and now wants revenge by taking Hinata.
In a 'hinata shouyou kidnapped' fanfiction, the plot might involve Hinata being kidnapped by a mysterious figure who has a vendetta against his volleyball skills. This person wants to break his spirit. Hinata is initially scared but then realizes he can't give up. He starts to look for weaknesses in the kidnapper's hideout. Meanwhile, his coach and team notice his absence and suspect foul play. They follow some clues that Hinata cleverly leaves behind and are able to rescue him. After his rescue, Hinata comes back stronger than ever, determined to show the kidnapper that he can't be broken.
Well, one possible plot could be that the Akatsuki kidnap Hinata to use her Byakugan for their own purposes. Maybe they want to study it to gain an edge in their battles or espionage. They might hold her captive in one of their secret hideouts, which could be an old, abandoned fortress.
Well, in a 'pit gets kidnapped' fanfiction, the plot could involve the search for Pit. Maybe his friends like Palutena start a quest to find him. They might face various obstacles and enemies along the way.
Well, the fanfiction could be that Esme gets kidnapped while she is on her way to an important event. The kidnappers might be holding her for ransom. Her friends then start to look for any clues. They might find out that the kidnappers have a secret hideout in an abandoned building. So they plan a rescue mission, but they have to be careful as the kidnappers are well - armed and dangerous.
It could be that Ginny is kidnapped because she has some special knowledge or power that the kidnappers want to exploit. Her friends form a team to rescue her. Along the way, they discover more about the kidnappers' motives and the true nature of Ginny's importance. There would be elements of mystery, adventure and friendship in the fanfiction.
Well, perhaps Voldemort's followers could kidnap Harry to use him as a bargaining chip. They might hold him in an old, dark wizarding house, guarded by dark magic. Harry would then try to escape using his own magic skills and the help of some unexpected allies like house - elves who secretly oppose Voldemort.
Maybe it's a new villain in the fanfiction. This villain could be after Luigi because he thinks Luigi has some sort of special power or knowledge. So the villain kidnaps Luigi in a very sneaky way, like using a magic spell to put Luigi to sleep first and then whisking him away to a secret lair hidden deep in a dark forest.
Well, one possible plot could be that the kidnappers are after some valuable information that Castle has. Maybe it's related to a case he was working on and they think he knows more than he actually does. So they take him to a secret location and try to force him to talk.
In a 'damian gets kidnapped fanfiction', perhaps Damian is kidnapped because he has some special knowledge or power. The kidnappers could be a secret organization. His friends might start to search for him, and along the way, they discover secrets about Damian they never knew before. They have to overcome various obstacles to find him, like decoding mysterious messages left by the kidnappers.