One interesting plot could be Harry, using his magic skills, accidentally transports himself to Elsa's world. There, he helps Elsa better understand and control her powers in a different way than she's used to. They might also team up to fight a common threat that endangers both the wizarding world and Arendelle.
Well, one plot could be about how Anna and Elsa deal with the challenges of pregnancy in a magical world. Maybe they have to learn new magic to protect their unborn children. Another could be the reactions of the people in their kingdom, like their friends and family being overjoyed and also a bit worried.
One interesting plot could be Elsa and Anna going on a magical adventure outside of Arendelle. They might discover a hidden land filled with unique creatures and have to use their sisterly bond and powers to overcome challenges there.
One interesting plot could be about how Elsa and Anna support each other during their pregnancies. Since they are sisters, they might share their experiences, fears and joys. For example, they could have late - night talks about how they are going to raise their children in the kingdom. Another plot could be the reaction of the kingdom's people to the news of their pregnancies. Some might be overjoyed and plan grand celebrations, while others might be worried about how it will affect the future of the kingdom.
One possible plot could be them ruling their kingdom together as a married couple, bringing new reforms and a more inclusive environment for all the citizens. They could also go on adventures, using their combined powers to help those in need in far - off lands.
Perhaps the fanfiction could center around the baby getting lost in the enchanted forest. Anna and Elsa then have to embark on a dangerous adventure to find the baby. Along the way, they encounter various magical creatures who either help or hinder their search, all while their bond as sisters and as caregivers is tested.
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 interesting plot could be that Elsa and Anna travel back to the time when their parents first met. They could witness the events that led to their family's formation and perhaps even influence some small details. Another plot might be them traveling to a future where Arendelle is in a post - apocalyptic state due to some magic gone wrong. They then have to figure out how to prevent this future from happening. A third plot could be them traveling to a parallel universe where they have different personalities and powers, and they have to find their way back to their own world while also learning valuable lessons about themselves.
One possible plot could be that Elsa and Hans meet secretly. They start to share their true feelings and dreams away from the prying eyes of the kingdom. As they fall deeper in love, they face the challenge of how to make their relationship acceptable to the people who have misjudged Hans in the past.
A plot could involve Jack and Elsa being brought together by a prophecy. The prophecy states that their union will bring balance to the magical world. At first, they are hesitant, but as they get to know each other better, they find that they complement each other perfectly. They then plan their wedding while also preparing to fulfill the prophecy.
A third idea is a time - travel based fanfiction. Elsa somehow gets sent back in time to the era of Harry Potter's parents. She uses her powers to save them from Voldemort, which changes the entire future of the wizarding world. Harry then meets Elsa in his own time, and they have to figure out how her actions in the past have altered the present and what they can do to keep the peace in this new, changed world.