A possible plot is that Eggman kidnaps Sonic because he wants to prove to the world that he can finally defeat Sonic. He locks Sonic in a high - security cell. Sonic, while in captivity, starts to communicate with other captured creatures. They work together to create a distraction so that Sonic can break free. Sonic then races through Eggman's base, destroying his machines along the way and finally makes his escape.
Well, in a 'Sonic gets kidnapped by Eggman' fanfiction, there could be a plot where Eggman tries to turn Sonic into a weapon. He might experiment on Sonic, but Sonic resists with his strong will. Meanwhile, Sonic's friends like Tails start searching for him. Tails could use his intelligence to track down Eggman's hideout. And when they finally find Sonic, there's an epic battle between Sonic's friends and Eggman's forces to free Sonic.
Obviously, Sonic and Eggman are the key characters. Sonic is the kidnapped one and Eggman is the kidnapper. But also, Tails could be a very important character. Since he is Sonic's best friend, he would likely be the first to try and rescue Sonic. Knuckles might also be involved. He could help in the search or be the muscle during the rescue mission.
One interesting plot could be Sonic and Eggman having to team up against a new, more powerful enemy that threatens their world. They put aside their differences and combine their unique skills, like Sonic's speed and Eggman's inventions, to defeat the foe.
One possible plot could be that Sonic is bullied by a new group of antagonists in his world. They might make fun of his speed, saying it's not all that great and constantly tripping him up during races. Another plot could be that Sonic is bullied by some of the other characters who are jealous of his popularity. They start spreading false rumors about him, which makes some of the animals in the forest start to avoid him.
One possible plot could be that Ash is kidnapped by a rival trainer group who want to steal his Pokémon. His friends then have to embark on a rescue mission, facing various challenges and battles along the way.
A really interesting plot could be that Sonic is kidnapped into another dimension by a powerful being. In this dimension, the laws of physics are different, and Sonic has to figure out how to use his speed in new ways to escape. His friends back in his own dimension are desperately trying to find a way to bring him back. Meanwhile, Sonic meets some strange new allies in this other dimension who help him in his quest to return home.
A really cool Sonic and Eggman fanfiction could be set in an alternate universe. In this universe, Sonic is not the hero he is in the main canon. Instead, he's more of an anti - hero, and Eggman is the one trying to save the world from Sonic's reckless behavior. It flips the traditional roles and makes for a very engaging read.
One interesting plot could be Sonic forgetting who his friends are. His friends then have to re - introduce themselves and remind him of all the good times they've had together. For example, Tails could show Sonic their workshop and all the inventions they made together, gradually triggering Sonic's memories.
One possible plot could be Sonic being framed for stealing the Chaos Emeralds. He then has to go on a journey to prove his innocence while facing his friends who have turned against him.
One interesting plot could be that Link is kidnapped by a group of rogue Sheikah. They believe Link has a special power that can be used for their own gain. His friends then embark on a quest to rescue him. They face various puzzles and enemies along the way. Another plot might be that Link is kidnapped by a powerful sorcerer who wants to use Link's connection to the Triforce. Link has to find a way to escape while his friends try to figure out where he is. Maybe there's a time limit too, adding more tension to the story.
A common plot in 'Aria Gets Kidnapped Fanfiction' is the psychological battle. The kidnapper may try to break Aria's spirit, but she refuses to give in. She uses her mental strength to outwit the kidnapper. For instance, she might pretend to be compliant while actually looking for ways to signal for help. Another aspect could be the discovery of new powers or abilities within Aria during her captivity. This could be something like she discovers she can communicate telepathically with a nearby animal who then helps her escape. Also, there could be a plot where the kidnapper is actually a misunderstood character, and through her time with him, Aria comes to understand his motives and tries to reform him.