Well, one possible plot could be that Hans kidnaps Anna with the intention of using her as a bargaining chip against Elsa. He might take her to a remote location. Then, Kristoff could find out and go on a heroic rescue mission with Sven. Along the way, he might face various obstacles set up by Hans' minions.
A fanfiction about Hans kidnapping Anna could start with Hans believing that by kidnapping Anna, he can force Elsa to give up the throne. He holds Anna in an old, abandoned castle. Anna tries to reason with Hans, but he is too blinded by his thirst for power. However, Anna manages to leave some clues for her friends to find her, and in the end, they all work together to stop Hans.
In a 'Hans kidnaps Anna' fanfiction, perhaps Hans has a secret alliance with a dark sorcerer. He kidnaps Anna to sacrifice her in a dark ritual that would give him ultimate power. Anna, being the strong - willed character she is, tries to escape on her own. Meanwhile, Elsa senses something is wrong through their sisterly bond and starts to search for Anna.
One plot idea could be that Hans' true motives are revealed to be part of a larger scheme to take over Arendelle by using Anna as a hostage. Another could be that Anna manages to outwit Hans during the kidnapping through her kindness and understanding, making Hans question his own actions. Maybe in the fanfiction, Kristoff and Sven come to the rescue and there's an epic showdown in the mountains.
The story could end with Anna being rescued by Elsa and Kristoff. They could overpower Hans and lock him up for his crimes. Anna would then be reunited with her sister and the people of Arendelle, and they would all live happily ever after.
One possible plot in this fanfiction is that Hans kidnaps Elsa not just for power or revenge, but because he is being controlled by some dark magic. He takes Elsa to a remote location where she has to fight not only Hans but also the source of the dark magic to free herself and save Arendelle. Along the way, Elsa might discover new aspects of her powers that she didn't know before.
Elsa would be extremely worried and angry. She would probably use her powers without hesitation to find Anna. Kristoff would be very determined to rescue Anna. He loves her and would do anything to get her back. Olaf might not fully understand the situation at first but would still try to help, like using his cheerfulness to keep Anna's spirits up while she's kidnapped.
One plot could be that an ancient curse has been placed on Anna that only Hans can break. But Hans doesn't know how to break it at first. They go on a quest together, searching for the solution. During this journey, they encounter various magical creatures and obstacles. As they spend more time together, Hans realizes how much he has wronged Anna and is determined to make it up to her. By the end of their adventure, not only is the curse broken, but they also have a new - found respect and love for each other.
Anna could be the one to save Elsa. After all, she has proven herself brave and determined in the original story. She would stop at nothing to rescue her sister from Hans's clutches.
One common theme is redemption. Since Hans was a villain in the movie, many fanfictions explore his path to redemption in the eyes of Anna. Another theme is adventure. They often go on adventures together, which helps in building their relationship.
Well, one possible plot could be that Hans has some hidden motives for kidnapping Elsa. Maybe he wants to use her powers for his own gain, like ruling Arendelle through her magic. He could hold her in a secret location and try to force her to cooperate.
Perhaps in the fanfiction, Elsa realizes that Hans was misunderstood. He was under pressure from his own family to try and take over Arendelle in a wrong way. As Elsa forgives him and they start working together to improve relations between their kingdoms, they develop feelings for each other. Hans courts Elsa in the traditional way, with flowers, poems, and horse - drawn carriage rides. Eventually, they get married and use their combined leadership skills to create a more prosperous and peaceful world for their people.
The pregnancy could be a false alarm. It might be a ploy by the Empire to discredit Leia and Han. They spread the news of the pregnancy to make the Rebellion look bad or to create chaos within their ranks. So, Leia and Han would have to prove that it's not true and also find out who's behind this scheme.