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.
Redemption can be a theme too. Maybe Kristoff has made some mistakes in a fanfic's plot and he has to work towards redeeming himself. Or perhaps Anna has to make amends for something. And of course, there are the themes related to the magical elements of their world. They could be on a mission to save the magical realm they live in, or discover new magical artifacts together. These themes add depth and excitement to the fanfictions.
A common theme is also family. They both have connections to different families in the 'Once upon a time' story, and fanfictions might focus on how their families interact with their relationship. For example, how Anna's sister Elsa might react to their relationship growing. There's also the theme of self - discovery. As they go through different situations in fanfictions, they might learn more about themselves and their place in the world. This could be related to their powers (in the case of Anna having some kind of magic connection perhaps in some fan ideas) or just their roles as individuals in their society.
In Elsa and Anna fanfiction, a prevalent theme is the exploration of their powers. For example, Elsa might learn to control her powers in new and unexpected ways, and Anna could develop some sort of magical ability as well. Redemption is another theme, especially for Elsa if the story is set in an alternate universe where she made different choices in the past. Also, there are fanfictions that focus on the two sisters dealing with political intrigue in Arendelle, adding a new layer to their characters.
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 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.
One popular theme is Gideon's relationship with his family. Given his complex family situation in the show, fanfictions often explore how he copes with it, like his bond with his mother or father. Another theme is his journey of self - discovery. As he grows and changes in the series, fanfics may expand on that, showing his internal struggles and how he overcomes them.
Family relationships are a big theme. Some fanfics focus on the family dynamics between characters like the Charmings and their descendants. There are also fanfictions that revolve around the theme of identity. Characters in 'Once upon a time' often have complex identities, and fan writers like to dig deeper into how these identities are formed and how they can change over time.
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.
A lot of Neal and Emma fanfictions also deal with the theme of second chances. Neal coming back into Emma's life can be seen as a second chance for their relationship. These stories might explore how they make the most of this second opportunity, dealing with past issues and looking forward to a future together. Some might also explore the theme of sacrifice, where one of them has to sacrifice something for the other or for their relationship.
One popular theme is their lost love. Since they had a complicated relationship in the show, fanfics often explore what could have been if things had gone differently. Another theme is redemption for Neal. Fans like to write about him making up for his past mistakes in relation to Emma.
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.
One popular theme is alternate universes. For example, what if Emma Swan had grown up in the Enchanted Forest instead of our world. Another theme is exploring different relationships between characters. Some fanfictions focus on a deeper friendship between Regina and Snow White that might have developed under different circumstances. And then there are those that delve into the backstories of minor characters, like how the Blue Fairy came to be.