A more detailed title could be 'In the Grip of Magneto: The Kidnapping of Rogue in Fanfiction'. Here, the phrase 'In the Grip of Magneto' gives a sense of Rogue being in Magneto's power due to the kidnapping, which is the central plot of the fanfiction.
One plot twist could be that Rogue actually has a hidden power that Magneto didn't know about and she uses it to turn the tables on him. Maybe she can absorb his magnetic powers in a different way than expected.
Well, you could go for something straightforward like 'Itasaku - Kidnapped'. Another option might be 'In the Clutches of Itachi: Sakura's Kidnapping in Itasaku Fanfic'. And also 'Itasaku: Sakura's Abduction'.
A common theme is the power dynamic between them. Given Magneto's powerful control over magnetism and Rogue's power - absorbing ability, their relationship often revolves around who has more power in different situations.
One possible title could be 'The Kidnapping of Fluttershy in the MLP Universe'.
One great piece of Rogue and Magneto fanfiction is 'Magnetic Attraction' which explores their complex relationship in a post - apocalyptic world. It has great character development and some really interesting plot twists.
One possible plot could be that Ron is kidnapped by a dark wizard who wants to use him as bait to lure Harry Potter. Maybe this dark wizard believes that Harry would do anything to save his best friend. Another idea is that Ron is kidnapped by a group of rogue house - elves who are angry at the wizarding world's treatment of them and think that taking a prominent wizard like Ron will make a statement. Or perhaps he is kidnapped by a fanatical fan of a rival Quidditch team who wants to disrupt the Gryffindor team's performance.
Well, there's obviously the rogue. This could be a villainous character from the original source material or an original creation. Then there's the kidnapped character, who could be the protagonist or a beloved secondary character. There might also be a hero or group of heroes who will try to rescue the kidnapped one. This could include the main hero of the original story or a new character created for the fanfiction.
Another concept could be that Harry Potter discovers he has a connection to Magneto's mutant powers. This might happen during a strange encounter with a dark magic object that unlocks a latent power within him. He then has to learn how to control these new abilities while also dealing with the threats in his own wizarding world, and he might seek out Magneto for guidance in a secret meeting across the boundaries of their two worlds.
One common theme could be the rescue mission. There might be the kidnapped character's friends or allies trying to save them from the rogue. Another theme could be the psychological struggle of the kidnapped character, like how they deal with fear and captivity. Also, the backstory of the rogue, such as why they kidnapped the character in the first place, can be a significant part of the story.
One idea could be that Oscar is kidnapped by a group of Grimm - inspired bandits. They might want to use him as a bargaining chip against the Huntsmen and Huntresses. They could hold him in an abandoned mine or a hidden fortress in the wilds.