In some fanfiction scenarios, she could be kidnapped by a time - traveling villain who comes from a future where she has caused a major change that they don't like. So they go back in time to stop her by taking her out of the equation. Another idea is that she is kidnapped by a group of outcasts who think that by having her, they can finally gain acceptance in the ninja world. They hold her hostage and demand that the villages give them certain rights and privileges in exchange for her safe return.
One idea could be that Naruto is kidnapped by an enemy who wants to use his Nine - Tails power for their own evil plans. His friends then have to embark on a dangerous rescue mission, facing various traps and powerful foes along the way.
One idea could be that Sasuke is kidnapped by an unknown enemy who wants to use his power against Naruto. Naruto then has to embark on a dangerous journey to rescue him. Along the way, he discovers some hidden secrets about Sasuke's past that make him more determined to save his friend.
One plot idea could be that Hinata is kidnapped by a rogue ninja group who wants to use her Byakugan for their own evil purposes. Naruto then embarks on a dangerous mission to rescue her, facing various challenges along the way.
One plot idea could be that a powerful enemy from a hidden village kidnaps fem Naruto because they believe she holds a special power that can tip the balance of power in their favor. They keep her in a hidden lair, and her friends embark on a dangerous rescue mission. Another could be that a group of rogue ninjas kidnaps her for ransom, thinking the Hidden Leaf will pay a great deal to get her back. They underestimate her ability to escape on her own though, leading to an interesting cat - and - mouse chase.
One plot idea could be that Elsa is kidnapped by an evil sorcerer who wants to use her ice powers for his own dark deeds. The heroes from her world then have to embark on a journey to rescue her. Another could be that Elsa is kidnapped by a group who think her powers are a threat and they plan to keep her locked away forever. However, her sister Anna discovers her whereabouts and tries to free her.
One plot idea could be that Cinderella is kidnapped by an evil sorcerer who wants to use her beauty for a dark spell. Her fairy godmother then has to enlist the help of the animals she befriended to rescue her. Another idea is that Cinderella is kidnapped by a jealous rival from another kingdom who wants to take her place at the prince's side. The prince then sets out on a heroic quest to find and save her. A third plot could involve Cinderella being kidnapped by a group of bandits who mistake her for a wealthy noblewoman, and she has to use her wits to escape.
Maybe the Gerudo see Zelda as a key to unlock an ancient prophecy that they think will benefit them. So they take her. During her captivity, Zelda could try to reason with the Gerudo, learning about their culture and beliefs, and in the end, a mutual understanding could be reached, and she could be released without the need for a violent rescue by Link.
Another plot could be that Rapunzel is kidnapped by a mysterious figure from her past that she doesn't remember. As she's held captive, she starts to have flashbacks of her early childhood and discovers secrets about her family. Meanwhile, Flynn Rider and the others are on a frantic search for her, and Rapunzel has to find a way to signal them while also dealing with the revelations about her past.
One idea could be that a rare and powerful Pokemon is kidnapped by a mysterious organization aiming to use its power for evil. A young trainer then sets out on a dangerous journey to rescue it. Another could be a Pokemon being kidnapped from a Pokemon sanctuary, and the local Pokemon community unites to get it back.
One plot idea could be that a group of dark mages kidnap Erza to use her as a bargaining chip against her guild. They know her strength and reputation, so they think they can force Fairy Tail to give up some valuable magical artifacts. Another could be that an obsessed fan of Erza's kidnaps her, believing that she can be 'tamed' and made to love him. This could lead to a story of Erza having to outwit this deranged individual while also trying to escape from his clutches.