Perhaps in the fanfiction, Dagur is exiled from his tribe and Female Hiccup finds him in a weakened state. She decides to help him get back on his feet. As she teaches him new ways of living and interacting with dragons, they grow closer. Dagur starts to change his old ways because of her influence, and they fall in love while exploring new lands and taming new dragons together.
One plot idea could be that Dagur and Female Hiccup are forced to team up to face a new threat in their land. They start off not trusting each other but as they go through various challenges together, they begin to respect and then develop feelings for one another. Another could be a story where Female Hiccup has to save Dagur from a dangerous situation and in the process, Dagur realizes how strong and amazing she is, leading to a friendship that could turn into something more.
The unique character dynamics. A female Hiccup would bring a different perspective to the relationship with Dagur. Their interactions can be full of surprises and new interpretations of the original story's relationships.
You can start by looking on fanfiction platforms like Archive of Our Own (AO3). It has a vast collection of fanfics on various topics, including those about Female Hiccup and Dagur. Just use the search function and type in relevant keywords.
The contrast between their personalities. Hiccup is more calm and calculating while Dagur is wild and impulsive. When a fanfic plays on this difference, it can create really engaging storylines.
The relationship can be developed through shared adventures. For example, they could go on a quest to find a rare dragon. Along the way, they face difficulties like harsh weather and dangerous terrains. By relying on each other's skills, they start to bond. Dagur's strength and combat skills combined with Female Hiccup's intelligence and dragon - handling abilities make them a great team. This mutual dependence can lead to deeper feelings.
One common theme is the idea of an unlikely friendship or alliance. Given their different personalities in the original How to Train Your Dragon universe, seeing how a fem Hiccup and Dagur would interact in a friendly or cooperative way can be really interesting.
Hiccup could try to resist by using his intelligence. He might find loopholes in Dagur's plans or demands. For example, if there are certain cultural or traditional rules that Dagur is using to force the marriage, Hiccup could find ways to show that those rules are being misinterpreted or misapplied.
One plot idea could be that Hiccup, as a female, has unique ways of bonding with the dragons. For example, she might use her more empathetic nature to understand their needs better than in the original story. Another could be that she faces different challenges in the Viking society which is often male - dominated. Maybe she has to prove herself even more to be accepted as a dragon rider.
A really interesting plot could be a time - travel one. Maybe Female Hiccup travels to Jack Frost's past or vice versa, and they have to adjust to the different time periods while also falling in love. Or perhaps there's a plot where they are both tasked with protecting a special, magical artifact that has the power to change the balance of their worlds, and they have to overcome their differences to succeed.
Sure. You can try searching on fanfiction.net. There are often many works related to different character pairings there. Just type in 'fem hiccup and dagur' in the search bar, and you'll be able to find a variety of fan - created stories about them.
One idea could be Hiccup discovers a hidden tribe in a remote jungle. Another could be that he encounters a mythical creature in an uncharted ocean region. Maybe he also teams up with a group of international dragon riders to save a world - spanning dragon sanctuary.