Well, a plot might be that a group from the Fallout universe stumbles upon Arendelle before the apocalypse in the Frozen world. They see Elsa's powers and believe it could be a key to preventing their own world's destruction. So they try to convince Elsa to come with them. In another scenario, Elsa's powers start to go out of control in the Fallout world and she accidentally freezes large parts of it, causing a whole new set of problems for the inhabitants. And a different idea could be that a character from Fallout, like the Lone Wanderer, has to help Elsa deal with her emotional issues which are causing her powers to act up, and in return, Elsa uses her powers to help the Wanderer in their quests.
One plot idea could be that Elsa from Frozen somehow ends up in the Fallout wasteland. Her ice powers could be both a hindrance and a help. For example, she could use her ice to create shelters in the harsh environment, but her powers might also attract unwanted attention from raiders or mutants. Another idea is that the Brotherhood of Steel discovers Elsa and tries to study her powers, thinking it could be some sort of advanced technology. A third plot could involve Anna coming to the Fallout world to find Elsa and they team up with some of the more friendly factions in the game to survive and try to find a way back home.
A possible plot for a Frozen x Fallout fanfic could be that Elsa and Anna are transported to the Fallout world during a nuclear experiment gone wrong in Arendelle. Once there, they meet up with some of the Vault - Dwellers. Elsa's ice powers are initially feared by the people of the wasteland, but as they get to know her, they realize she can be an asset. For instance, she can freeze the water in irradiated pools to make them safe. Meanwhile, Anna tries to befriend the locals and learn their ways. They also encounter a group of super mutants who are intrigued by Elsa's powers and want to use them for their own gain, which leads to a big showdown where Elsa has to use her powers to protect herself, Anna, and their new friends from the Vault.
One plot idea could be that Finn and Jake from Adventure Time end up in the Fallout wasteland. Finn, with his sword skills, could be on a quest to find a special artifact to get back to their own world. Jake, with his shape - shifting abilities, might help them survive against the various mutated creatures in the Fallout universe. Another idea is that the Vault - Tec technology in Fallout somehow merges with the magical elements of Adventure Time, creating strange new hybrids of mutants and magical beings.
One plot idea could be that Anna discovers a new magical power within herself and Elsa helps her learn to control it. This could involve a journey through the Enchanted Forest where they face various challenges together and their bond grows stronger as a result. Another idea is a time - travel plot where they go back in time to prevent a past event that had a negative impact on their relationship. They could also face a new villain who is specifically targeting their sisterly bond, forcing them to work together to defeat the foe.
One idea could be that the OC is a powerful mage from a far - off land who comes to Arendelle during a time of new danger. The OC meets Elsa and they initially have a bit of a clash due to their different ways of using magic. But as they face the new threat together, they start to understand and respect each other more. Eventually, they combine their magical powers to save Arendelle and in the process, form a deep friendship or even more.
A cool plot could involve the characters from Frozen getting stuck in the RWBY world and having to learn how to fight Grimm. Anna might be really eager to learn combat skills, while Elsa is more focused on controlling her powers in this new and dangerous environment.
One idea could be that the RWBY characters find themselves in the Fallout wasteland. Ruby could use her Crescent Rose to fend off mutants. Weiss might struggle with the harsh and dirty environment compared to her usual clean Atlesian surroundings. Blake could use her stealth skills to navigate dangerous areas, and Yang's strength would be useful in combat against raiders. They could be on a quest to find a way back to their own world while also trying to make the wasteland a better place.
One idea could be to focus on a character who is a pre - war scientist awakened in the post - apocalyptic world. They could use their scientific knowledge in unexpected ways to survive and perhaps try to rebuild some aspects of pre - war technology. Another interesting angle is to write about a group of settlers trying to establish a new community in an area filled with dangerous creatures. They would have to deal with not only the external threats but also internal conflicts within the group.
One idea could be a fanfic that focuses on Elsa's further exploration of her powers. Maybe she discovers a new aspect of her magic in a far - off land. Another could be a story about Anna and Kristoff's adventures during their honeymoon. They could encounter new magical creatures. And a third idea is a fanfic that delves into the backstory of the Northuldra people, showing more of their culture and history before the events of Frozen 2.
A more complex plot might be that Naruto's presence in the Fallout 4 world starts to change the balance of power. His positive energy and strong will begin to inspire the people in Piper's settlement. Meanwhile, Piper helps Naruto understand the political and social dynamics of the wasteland, and together they try to bring peace and unity among the different factions.
Some interesting Frozen 2 fanfiction plot ideas could revolve around the idea of a magical item. For example, there could be a magical crystal hidden deep in the forest that has the power to either save or destroy both the forest and Arendelle. Elsa and her friends embark on a quest to find this crystal before it falls into the wrong hands. Another idea is that a dark force from outside the known world tries to invade the forest and Arendelle, and the characters have to unite not only the people of Arendelle and the forest but also other magical beings to fight against it. Also, a plot could be centered around a prophecy that was never fully revealed in the movie, and Elsa and Anna must figure out what it means for their future.
A possible plot could be that there is a lemon - themed festival in Arendelle. Hans, who has returned after his banishment, tries to win Elsa's forgiveness during this festival. Elsa is initially skeptical but as they both participate in the lemon - inspired games and activities, they start to develop a new relationship that is different from their previous encounter.