Who could be the main antagonist in the 'Anna and Elsa have a baby' fanfiction?

Well, perhaps the fanfiction could be about how the baby brings Anna and Elsa even closer together. Since they already have a strong bond, the baby could be like a little miracle that makes their family complete. The story could show their daily life taking care of the baby, like singing lullabies and teaching the baby to walk, with a lot of cute and heart - warming moments.

There could be a dark spirit that has been awakened by the little brother's emerging powers. This spirit is angry at being disturbed and decides to target the little brother. It causes chaos in Arendelle, blaming it all on the little brother. As the story progresses, the little brother has to find a way to either defeat or pacify this dark spirit to save his home and family.

There might also be new characters introduced specifically for the fanfiction. For example, a wise old woman who lives in the forest and has knowledge about the baby's true nature. She could guide Anna and Elsa on how to raise the baby and deal with any challenges that come with it.

The main characters are obviously Anna and Elsa. Anna is the more outgoing and warm - hearted sister, while Elsa has her ice powers and is more reserved. And of course, the baby is also a main character, whose presence drives the story forward.

One possible plot could be that the baby has special powers like Elsa. The kingdom is both excited and a bit worried. Elsa and Anna have to figure out how to raise the baby while also dealing with the reactions of the people. They might face some challenges when the baby's powers start to show early, like accidentally freezing things. But with love and support from each other and their friends, they manage to raise the baby in a happy and healthy environment.

Elsa and Anna's relationship would likely become more complex. They would have to make decisions together about the baby's upbringing. There might be some disagreements at first, like how much to let the baby use its powers. But through these challenges, they would grow closer, learning to understand each other's perspectives better. For example, Elsa might be more cautious about the baby's powers due to her own experiences, while Anna might be more open - minded. Through communication, they would strengthen their bond as sisters and co - parents.

Maybe there is a dark force within the Goblin Kingdom itself. Some of the goblins might not be happy with Jareth having a half - human baby as his heir. They could plot against the baby and Sarah, trying to undermine Jareth's rule and get rid of the baby. Sarah and Jareth would then have to deal with this internal threat while also protecting their baby from outside forces.

One common theme is the bond between the sisters. Even as babies, they have a special connection that is often explored in these fanfictions. For example, how they comfort each other when they are scared or how they share their little joys.

It could be a vampire lord who has a vendetta against Elsa's family. He believes that they have something that belongs to him, and when he discovers Elsa, he decides to use her as a pawn in his scheme. This vampire lord is cruel and calculating, and he has an army of minion vampires at his disposal. He uses his charm and power to manipulate those around Elsa and tries to isolate her so that he can achieve his goals. He is also very strong and has abilities that make him a formidable foe for Elsa.

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.