A common theme is also about acceptance. The people of Arendelle need to accept the fact that their queen is going to be a mother. And Elsa herself has to accept the changes in her body and life. In addition, the theme of love is often present. Whether it's the love for her unborn child or the love from her friends and family during this time.
Perhaps it could be Kristoff. Although he was more interested in Anna in the original story, in fanfiction, the relationships can be reimagined. They could have developed a closer bond over time and he could be the father.
Well, in fanfiction, the rules can be bent. For Elsa to be pregnant, it could be part of a 'what if' scenario. What if Elsa had a different upbringing and was more open to relationships earlier? This could lead to a situation where she becomes pregnant. It might also involve some sort of prophecy or magical destiny that was previously unknown in the Frozen story, which now unfolds in the fanfiction.
It's possible that there are some out there. But keep in mind that a lot of fan - created content in the 'Frozen' fandom is centered around Elsa's growth as a character, her journey to accept herself, and her role in Arendelle. While pregnancy is a normal part of life, it might not be the first thing that comes to mind when thinking about Elsa in fanfic writing. Also, Disney has its own image of Elsa that some fanfics may or may not adhere to.
Another theme is the relationship between Elsa and the other characters in Frozen. For example, how Anna supports her sister during the pregnancy. It can also focus on Elsa's relationship with Kristoff and Sven, and how they adapt to the idea of a pregnant Elsa.
One common theme is the exploration of Elsa's new role as a mother - to - be. It often involves how she deals with the changes in her life and her powers in relation to her pregnancy.
It becomes deeper. They become more reliant on each other for emotional support. Since they are both going through the same experience of pregnancy, they can share their fears, joys, and concerns. For example, they might talk about how their bodies are changing and how they will raise their children.
There are 'pregnant Elsa Frozen fanfiction' stories that take a more adventurous turn. Elsa might find herself in a situation where her pregnancy is at risk due to some external threat. It could be a new villain who wants to use her unborn child for some dark purpose. In these stories, Elsa has to not only protect herself but also her unborn baby while still maintaining the balance of Arendelle. The other characters like Kristoff and Sven might also play important roles in helping Elsa during this difficult time.
One possible plotline could be that Elsa discovers she's pregnant and has to deal with the newfound powers that might be affected by her pregnancy. For example, her ice powers could become more unpredictable. Another could be Anna's pregnancy journey, where she has to balance her duties in Arendelle with the anticipation of motherhood. She might worry about how to raise a child in a kingdom that has faced so many challenges.
Her character would develop in terms of her relationships. She'd become closer to Anna as they share this new family experience. With the people of Arendelle, she might show a more maternal side, being more involved in the daily lives of her subjects, especially those related to families and children. And in terms of her powers, she might learn to control them even better, knowing that any outburst could endanger her unborn baby.