In some fanfictions, Anna and Kristoff might have a role reversal. For example, Kristoff could be the one in trouble and Anna has to be the strong one to save him. This would give a new perspective on their characters. Also, there could be a fanfiction where they are forced to live in a world without magic for a while. This would test how their relationship stands without the magic that is so prevalent in the 'Once Upon a Time' setting.
One popular theme is adventure. Since they are characters from a fantasy world, many fanfictions send them on new quests together. Another is love and relationship development. Writers often explore how their relationship deepens over time.
One way to find good fanfiction is to check out the reviews and ratings on the fanfiction websites. If a story has a high number of positive reviews and ratings, it's likely to be good. Also, look for authors who are known for writing quality 'Once Upon a Time' fanfiction. You can often find lists of recommended authors on fanfiction communities.
You can try fanfiction websites like Archive of Our Own (AO3). There are a large number of 'Once upon a time Anna and Kristoff' fanfictions on it. You can search by tags related to the characters, such as 'Anna', 'Kristoff', or 'Once upon a time' to narrow down the results. Another option is FanFiction.net, which also has a wide range of fan - created stories.
One idea could be that Belle and Anna, both orphans, meet in a magical forest. They discover they have a shared ability to communicate with forest spirits. Together, they embark on a journey to find a hidden library that is said to hold the secrets of their pasts. Along the way, they face challenges from an evil sorcerer who wants to stop them from reaching the library.
Well, adventure is a big theme. Anna is usually put in some sort of exciting adventure in the fanfictions, like exploring new lands or facing dangerous enemies. Magic is another theme. Given that 'Once Upon a Time' is full of magic, fanfictions often involve Anna dealing with different types of magic, either learning new spells or fighting against dark magic. And of course, there's the theme of good vs. evil, with Anna usually on the side of good.
For Belle, emphasize her love for knowledge as an orphan. Maybe she was left with only a few books from her parents, and that sparked her thirst for learning. She could be shy at first but becomes more confident as she and Anna face challenges. For Anna, highlight her adventurous spirit which could be a result of growing up without parents and having to fend for herself. She's always eager to explore new things.
Elsa would be a great character to pair with them. Given her relationship with Anna in the original story, and her ice powers could add an interesting dynamic to any story with Belle. They could all work together to save a frozen kingdom or something similar.
One interesting fanfiction could be about Belle and Anna becoming best friends in the 'Once Upon a Time' universe. They might go on adventures together, helping each other out with their respective problems. For example, Belle could use her knowledge of books to assist Anna in understanding some ancient magic that she comes across.
To develop their relationship in fanfiction, you could explore their different interests. Anna is more outgoing and loves adventures, while Elsa is more reserved. Have Anna introduce Elsa to new things like a local festival in a neighboring village. At the same time, Elsa can share her knowledge of magic with Anna. Also, create scenarios where they have to communicate better. For instance, if there's a misunderstanding between them caused by a new character in Arendelle, they need to talk it out to resolve it. This would deepen their understanding of each other.