At first, they might start as friends, intrigued by each other's ice powers. They could meet during a snowstorm and start to bond over their shared connection to winter. As time goes on, they realize they have a deeper emotional connection and start to fall in love.
Their relationship could develop gradually. Maybe they initially compete to see who has better control over ice. But as they spend more time together, they see the good in each other. Elsa might open up about her insecurities with her powers, and Jack Frost could share his own lonely past. This mutual understanding would lead to them falling in love and eventually thinking about marriage.
In many fanfictions, Jack Frost first senses Elsa's loneliness. He, who is also a bit of an outcast in his own way, feels a kinship. So he starts to visit her secretly. They exchange stories about their pasts, like Elsa's struggle with her powers and Jack's origin as a winter spirit. As they open up more, their feelings for each other develop, and they start to fall in love, which eventually leads to the idea of marriage.
It could start with mutual admiration. Jack might be intrigued by Elsa's ability to control ice on a large scale. Elsa, on the other hand, could be fascinated by Jack's carefree nature. As they spend more time together, they start to fall in love and decide to get married.
The relationship could develop in a rather tumultuous way. Jack might be too forward at first, which scares Elsa. But then he realizes his mistake and tries to be more gentle. Elsa, on the other hand, is constantly worried about her powers being discovered. Jack helps her to be more confident about it. They could have a big fight when Elsa finds out that Jack told a friend about her powers in a moment of weakness. But eventually, they make up and their relationship becomes stronger as they learn to trust each other more.
One possible plot could be that Elsa, from Arendelle, and Jack Frost, from his own wintry realm, meet by chance during a magical snowstorm that bridges their two worlds. At first, they are curious about each other's powers over ice. As they spend more time together, they start to fall in love. Their relationship might face challenges like how the people of Arendelle would accept Jack, a magical being not from their world. But in the end, they overcome all the obstacles and have a beautiful wedding ceremony with ice sculptures and snowflakes everywhere, uniting their two different worlds in a celebration of love.
One possibility is that it could be a story full of magic and adventure. They could combine their powers to protect their new kingdom. Maybe they'd create ice sculptures together that come to life and serve as their protectors.
At first, Sakura might be a bit intimidated by Kakashi. But as she becomes stronger and more confident, she starts to challenge him in a friendly way. Kakashi is intrigued by this new side of her. They could be paired on various missions where they have to rely on each other's skills. Sakura's medical skills could save Kakashi's life at some point, and this would make him see her in a different light. They would then begin to seek each other out more often, going for walks in the village and slowly falling in love before considering marriage.
At first, their relationship might be a bit rocky. Loki is used to his own schemes and Jack Frost has his own way of doing things in the winter realm. But as they interact more, they start to see the good in each other. Loki realizes that Jack Frost's cold exterior hides a kind heart, and Jack Frost sees that Loki's mischief is often a cover for his insecurities. They start to share their powers and knowledge. For example, Loki teaches Jack Frost some Asgardian magic, and Jack Frost shows Loki how to control ice in new and interesting ways. This sharing and mutual growth strengthen their relationship over time. They also start to defend each other against any threats or negative opinions from others, which further cements their bond.
Well, they would face acceptance issues. The people of Arendelle may be afraid of Jack Frost at first. He is a being associated with cold and winter, which can be seen as a threat. For Elsa, she would have to deal with the fact that Jack is used to a very different lifestyle, constantly on the move in the magical world. And then there are the power struggles. Their combined ice powers could be extremely strong. If they don't learn to control it together, it could lead to problems not just for Arendelle but for other surrounding areas as well. They also need to find a way to balance their personal lives with their new responsibilities as a married couple in two very different worlds.
Their wedding could be a magical affair. It might be held in a winter wonderland, with ice sculptures as the decorations. Elsa could walk down an aisle made of ice crystals, and Jack Frost could be waiting at the altar with a big smile. The guests could include all the characters from their respective stories, like Anna, Kristoff, Olaf from Elsa's side, and the Guardians from Jack's side.
One great 'Jack Frost x Elsa married' fanfiction might be 'Frost and Ice Union' which beautifully weaves their two magical worlds together. It shows how Jack's carefree nature compliments Elsa's more reserved self as they embark on a married life in a fictional Arendelle filled with new magical adventures.