The plot might involve a prophecy. There could be an ancient prophecy that states that when Jack and Elsa meet, they will bring a new era of peace and magic. At first, they are skeptical but as they get to know each other better, they realize they are drawn to each other. Their relationship develops as they face challenges together, like a powerful dark force that tries to stop their union. In the end, they overcome all obstacles and get married, becoming the king and queen of a combined magical land.
It could be Pitch Black. He might see the union of Jack and Elsa as a threat to his plans of spreading darkness. Their combined powers of ice and winter magic could be a powerful force for good, which he wants to prevent. So, he tries to create misunderstandings between them and stir up trouble in their relationship.
In this fanfiction, Marshmallow could be a significant character. He's a large and somewhat intimidating snow creature created by Elsa. But with the baby on the way, he could become a gentle protector. He could stand guard outside their home to keep any potential threats away. Also, the trolls from the Frozen universe could play a role. They are wise and could offer their knowledge on how to take care of a baby with magical powers. They might even perform a special ceremony for the unborn baby.
They can develop their relationship through their shared care for the baby. For example, when the baby is sick, Elsa uses her powers to keep it cool while Jack tries to cheer it up. This mutual effort in taking care of the baby can bring them closer.
One idea could be that Jack is the new student in high school and Elsa is the popular but reserved girl. They get paired for a science project and slowly discover they have a lot in common, like their love for winter and their insecurities. They start to bond over their shared experiences and develop a friendship that might turn into something more.
Well, it's possible that such a fanfiction exists. Elsa and Jack Frost are from different fictional universes (Elsa from Frozen and Jack Frost from Rise of the Guardians), but in the world of fanfiction, people often cross over characters and create all kinds of scenarios. However, I haven't personally come across a 'pregnant' fanfiction involving them. You might have to search on some dedicated fanfiction websites to find out for sure.
The best element is often the build - up of their relationship. It's exciting to see how two characters from different stories start to interact and fall in love. The anticipation before the kiss is what makes these fanfictions so engaging.
One common theme is family. The stories often focus on how Elsa and Jack build their family with the new baby, and all the joys and challenges that come with it.
Yes, there are some fanfictions with this theme. You can find them on various fanfiction websites like Archive of Our Own (AO3). However, this is a very creative and often out - of - canon concept that fans have come up with.