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.
In Jack and Elsa meet fanfiction, the authors usually explore the characters' personalities. Jack is often portrayed as a free - spirited and mischievous character, while Elsa is more reserved due to her past traumas. When they meet, they can learn from each other's experiences and grow. For example, Jack could teach Elsa to be more carefree, and Elsa could show Jack how to handle his powers more responsibly in some cases.
Well, without more context, it's difficult to tell the exact 'elsa and jack sad story'. It could be that Elsa, with her ice powers, and Jack, who has his own powers, meet and fall in love but then some dark magic or an evil force separates them. They might try to fight against it but in the end, they are left heartbroken and alone, with only memories of their time together.
Imagine Elsa and Jack Frost cross paths. Elsa is intrigued by Jack's ability to control ice in a different way than she does. But then an evil force emerges that targets both of them. To protect Elsa, Jack sacrifices himself. Elsa is left all alone, mourning for the friend she just found. She blames herself for not being strong enough to save him, and she returns to Arendelle, but with a heavy heart filled with sorrow for the loss of Jack Frost.
Sure, there are numerous Jack meets Elsa fanfictions. In some, their encounter is a bit more of a friendly rivalry at first. Maybe they compete in a snow - building contest or something similar, and as they get to know each other better, they become friends and learn from each other's abilities and experiences.
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.
I'm not sure which specific 'elsa and jack' sad story you mean. There could be many fictional or personal stories with characters named Elsa and Jack. Maybe Elsa and Jack were in love but separated by some external force, like a war or a family feud. Without more context, it's hard to tell the exact story.