One possible plot could be that Elsa discovers a new world where 'futa' exist and through a series of adventures, she falls in love with one and they decide to marry. Maybe they first meet when Elsa is lost in an enchanted forest and the futa character helps her find her way.
Well, perhaps in this fan fiction, Elsa's kingdom is in danger and a futa warrior arrives to help. As they fight side by side to protect the kingdom, they develop deep feelings for each other. Eventually, they realize their love is so strong that they want to get married, uniting their different worlds and powers.
Another possible main character could be a futa named Nova. Nova is an inventor in her world and has created many amazing gadgets. When Elsa visits Nova's world by accident, Nova shows Elsa all her inventions. Their shared sense of wonder and Nova's intelligence make Elsa fall for her, leading to the idea of marriage in the fan fiction.
A plot could be that Remy gets lost in a different part of the city and has to find his way back to Gusteau's while facing various obstacles like mean alley cats and difficult terrains. He also discovers new food cultures along the way and plans to incorporate them into his cooking.
A plot could involve Elsa's ice powers acting up during her pregnancy. Hiccup, being from a more technological and dragon - friendly world, tries to find ways to help her control it. They might seek the help of Toothless and other magical creatures in their world. Maybe they face opposition from some of their people who are not happy about their union, especially with a baby on the way. But they stand strong together and prove that love can bridge any gap.
One possible plot idea could be that in an alternate universe, Rem and Ram have a unique relationship where they face challenges together in a world that is more accepting of different genders and identities. Another could be a story where they discover a magical item that causes some changes in their physical forms and they have to deal with the consequences while still maintaining their strong bond. A third idea might be a journey they take together where they meet different characters who have different views on their relationship, and they grow stronger as a couple through these encounters.
Maybe a plot where Shego loses her powers and Kim Possible has to help her get them back. In the process, they explore Shego's past and discover some secrets that change their relationship. This could involve some emotional scenes and also some action scenes as they face obstacles along the way.
One plot idea could be that Elsa is kidnapped by an evil sorcerer who wants to use her ice powers for his own dark deeds. The heroes from her world then have to embark on a journey to rescue her. Another could be that Elsa is kidnapped by a group who think her powers are a threat and they plan to keep her locked away forever. However, her sister Anna discovers her whereabouts and tries to free her.
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.
One idea could be an adventure where Elsa teams up with a dragon (to tie in with the dragon master idea). Maybe the dragon is from a far - off land and Elsa has to learn to communicate with it to save Arendelle from a new threat.
Some common themes are power struggles. In futa fan fiction, a futa character could be vying for power in a political or magical realm. Also, there's the theme of friendship. They form deep bonds with other characters, helping each other through tough times. Family can also be a theme, such as a futa character reconnecting with their estranged family members in a fictional story.
A plot idea might be that there is a strange blizzard that is not caused by Elsa. Kristoff, suspecting foul play, comes to Elsa for help. Together, they discover a dark sorcerer is behind it. As they battle the sorcerer, Kristoff helps Elsa see that she doesn't have to be afraid of her powers and can use them more freely. This could lead to a deeper friendship or more between them.