Well, it could be about a person, maybe a young adventurer, who is captured by pirates. The story might then revolve around their attempts to escape or adapt to life on the pirate ship.
In 'Kidnapped by the Pirate Fanfiction', perhaps the kidnapped character has some special knowledge or a valuable item that the pirates want. So the pirates take them hostage. And then there could be a series of events where the character tries to outwit the pirates, all while the pirates are sailing the high seas, looking for treasure or engaging in other piratey activities.
The fanfiction 'Kidnapped by the Pirate' might start with a sudden abduction. The kidnapped character could be from a noble family or a simple fisherman's daughter/son. Once on the ship, they might face a cruel captain or some friendly pirates who are against the idea of kidnapping. There could be a love story that develops between the kidnapped one and a pirate, or it could be a story of pure survival and revenge against the pirates.
It could be a young woman who is a stowaway on a ship and gets discovered and kidnapped by pirates.
One possible plot could be that Aladdin is kidnapped by a powerful sorcerer who wants to use his knowledge of the magic lamp to gain more power. His friends, Jasmine and Genie, then have to embark on a dangerous journey to rescue him. They might face various obstacles along the way, like magical traps and other evil minions.
One possible plot could be that Luigi is kidnapped by a group of mischievous goombas who are being controlled by a powerful dark magic user. Luigi, while kidnapped, uses his wits to befriend some of the weaker goombas and gets them to help him send a message to Mario. Mario then has to figure out where Luigi is being held based on the clues in the message.
Well, it could be that pirates kidnap Moana. They have heard tales of her island's treasures. Once on their ship, Moana has to face the rough and rowdy pirates. She manages to befriend some of the more sympathetic ones among them and together they plot against the cruel captain. Eventually, she uses her knowledge of the sea to help them all when they get into trouble, and in return, they set her free.
The plot might involve a character being lured into Pennywise's lair, perhaps by the allure of missing things or people. Pennywise could use his shape - shifting abilities to deceive the kidnapped character throughout their captivity.
Well, it could be that Luffy gets kidnapped because of some secret he holds. Maybe there's a group that wants to find out the location of One Piece through Luffy, and they think kidnapping him is the best way. His friends then have to search for clues and race against time to save him before he's forced to reveal the information.
In a 'Vegeta kidnapped' fanfiction, perhaps Vegeta could be kidnapped by an old enemy seeking revenge. This enemy might be from his Saiyan past. They could be using him to draw out Goku, thinking Goku will come to save Vegeta. Vegeta, being proud, would likely struggle against his captors and try to break free on his own at first.
One possible plot could be that Levy is kidnapped by a rival guild who wants to use her knowledge of ancient magic texts for their own gain. Her friends in Fairy Tail then embark on a dangerous rescue mission, facing various traps and enemies along the way.
One possible plot could be that they kidnap a character to gain some sort of power. Maybe they think the kidnapped character has a special ability or knowledge that they need. For example, if it's in a superhero - themed fanfiction, the kidnapped character might be able to control an element, and Will and Phobos want to use that power for their own evil plans.
Well, it could be that the Flash, perhaps under some mind - control or in a desperate situation, kidnaps someone important in the fanfiction world. Maybe he's trying to prevent a greater evil and thinks this is the only way.