If Elsa joins the Avengers in fanfiction, it would be a really interesting mix. Her powers are very different from the other Avengers. She might have a hard time adjusting to the high - tech environment at first. But her strong will and magical abilities would soon make her an important part of the team. For example, she could help Iron Man by creating ice platforms for him to land on during flight, or assist Thor by freezing his enemies before he strikes them with his hammer. And her relationship with the other characters, like her potential friendship with Black Widow or her possible rivalry with Hulk (because of their different ways of handling power), would add a lot of drama and new storylines to the fanfiction.
Black Widow could be the first to form a friendship with Elsa. Black Widow is very perceptive, and she would quickly realize that Elsa is not a threat but a potential ally. She has a way of getting close to people and making them feel comfortable. She could help Elsa adjust to the new and strange world of the Avengers, and they could bond over their shared experiences of being different from the rest of the group. Elsa's powers would also be something that Black Widow could see as a valuable asset in their missions.
A possible plot is that Elsa's kingdom is threatened by a force that is related to the same kind of threats the Avengers face. The Avengers hear about her and her powers and travel to her world to offer their help. Along the way, they learn about her backstory, and she learns about their heroics. Together, they combine their powers to save her kingdom and in the process, Elsa decides to join the Avengers on some of their adventures in their own universe.
She would be an interesting addition. Her calm and regal nature might balance out some of the more impulsive Avengers. For instance, she could calm down Hulk when he's about to rage.
Anna would be a likely candidate to rescue Elsa. She loves her sister deeply and has shown great courage in the past. She would stop at nothing to find and free Elsa from Hans.
Anna could be the one to save Elsa. After all, she has proven herself brave and determined in the original story. She would stop at nothing to rescue her sister from Hans's clutches.
She might face the challenge of controlling her powers during labor. Since her emotions are closely tied to her ice powers, the pain and stress of giving birth could cause unexpected ice surges. Also, she has to deal with the public perception. As a queen, her giving birth is a big event for the kingdom, and there could be a lot of pressure on her.
Anna would surely be the first to help Elsa. Anna has always been there for her sister, and when Elsa gets sick, she would do everything she could, like bringing her warm soups and staying by her side to keep her company.
The trolls could play an important role. They are mysterious and have their own magic. In dark Elsa fanfiction, they might be the ones who try to either contain Elsa's dark powers or guide her towards using them in a more positive way. Also, a new character could be introduced, like a powerful sorcerer from a far - off land who is either drawn to Elsa's powers or sees her as a threat and wants to eliminate her.
In some of these fanfictions, Sven could be a significant character. He might help Kristoff in his tasks related to Anna's pregnancy, like carrying supplies. Another character could be the trolls. They are known for their wisdom in the Frozen universe. So they could offer advice to Elsa and Anna about their pregnancies, such as how to deal with any magical complications or how to raise their children to be good and strong. And of course, the people of Arendelle are also important. Their reactions and support play a role in the story.