A forgotten ice demon that was once sealed away could be an antagonist. With the birth of the baby, the balance of power in the ice - and - snow - filled regions starts to shift, and this demon senses an opportunity to break free and take over. It sees the baby as a key to its domination, either by corrupting the baby's powers or using it as a bargaining chip against Jack and Elsa.
Well, perhaps a power - hungry wizard from a neighboring magical realm. He hears about the baby's unique powers that combine Jack Frost's and Elsa's abilities and wants to harness that power for his own evil plans. Or it could be a group of dark fairies who are envious of the baby's special connection to both the winter world and Arendelle. They might try to kidnap the baby and raise it to be on their side, away from Jack and Elsa.
The story could be about the baby's discovery of its powers. It might start with the baby accidentally creating a small snowflake, which then grows into a large snowstorm. Elsa and Jack would then have to teach it how to control this power.
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.
If we're talking about a fanfiction where Elsa and Jack Frost have a baby, there are so many storylines that could develop. The baby could be a key to uniting different magical realms that are related to winter. It might face challenges growing up, such as being accepted in both Elsa's world and the world where Jack Frost belongs. The baby's powers could also be a source of both wonder and danger. For example, if it couldn't control its powers properly at first, it could accidentally cause blizzards or freeze things in inappropriate places. But with the love and guidance of its parents, it could learn to use its powers for good and become a beloved figure in the winter - themed magical world.
One possibility could be that their baby has unique powers. Since Elsa has ice powers and Jack Frost is also associated with ice and cold, the baby might be able to create the most beautiful ice sculptures with just a thought. The story could focus on how they raise this special child in a world that may not fully understand its powers at first.
The story could start with Elsa and Jack Frost falling in love and then having a baby. The baby might inherit Elsa's insecurities about her powers, but also Jack's carefree spirit. It could grow up in a world where people are initially skeptical of it, but as it shows kindness and uses its powers for good, it wins over the hearts of the people. For example, it could use its powers to create beautiful ice sculptures that bring joy to the children of Arendelle and also to Jack's friends in his world. The baby could also have adventures where it discovers new ways to use its powers, like creating ice bridges between different lands or making frost - covered playgrounds for the kids.
One interesting plot could be that Jack Frost discovers Elsa's baby has the power to control both ice and snow in a unique way. He then decides to mentor the baby in controlling its powers. Another could be that the baby's presence somehow brings a new season to the magical world that combines the best of Jack's winter and Elsa's Arendelle's climate.
One possible plot could be that Elsa and Jack Frost meet by chance in a magical realm that bridges their two worlds. They fall in love quickly. Then Elsa discovers she is pregnant. They have to hide from the forces in their respective worlds that would oppose their union because of the pregnancy and the implications it has on the balance of magic.
One possible plot could be that Jack Frost, perhaps out of loneliness or a misunderstanding, kidnaps Elsa. He takes her to his icy realm. Elsa is initially scared but then realizes Jack has his own insecurities. They start to talk, and Elsa, with her power over ice, shows Jack new ways to use his powers. Eventually, they become friends and Jack realizes his mistake and returns Elsa to Arendelle.
One possible plot could be that Jack Frost, being the spirit of winter himself, is intrigued by Elsa's ice powers. They could start by having a friendly competition to see who can create the most magnificent ice sculptures. Their powers combined might accidentally create a new, magical ice realm that they then have to explore and protect together from an approaching threat, like a dark sorcerer who wants to steal their ice magic.
One possible plot could be that Jack, with his carefree and fun - loving nature, and Elsa, with her strong and protective side, discover they are having a baby. They could face challenges like how to combine their two very different worlds. Jack's world of eternal winter playfulness and Elsa's more regal, ice - castle - based world. They might worry about how their baby will inherit their powers and whether they can keep their child safe from those who might want to use the baby's powers for evil.