Adventure could be a common theme. Since Kristoff and Sven are often associated with traveling in their original story, in fanfics, they might go on new adventures together in a more romantic context. Another could be friendship turned into love, as they start off as friends and the fanfic could explore how that relationship evolves into a gay relationship.
Finding specific 'gay kristoff and sven fanfic' can be a bit tricky. One way is to join fan communities related to the source material (if there are any). People in those communities might be able to point you in the right direction or even share some of their favorite fanfics that involve this particular relationship.
One possibility in fanfiction is that they start a family right away. Kristoff would be a loving and protective father, teaching their children about the ways of the forest and ice. Anna would pass on her knowledge of the kingdom and how to rule with kindness. Their home would be a place full of love and laughter, with Sven often coming around to visit.
One possible antagonist could be a power - hungry wizard who wants to take over the kingdom of Arendelle. He sees Anna and Kristoff as threats to his plans and tries to stop them from protecting the kingdom. He uses dark magic to create various obstacles for them.
One idea could be that their baby has a special power related to ice like Anna and Elsa. Maybe the baby can create beautiful ice sculptures at a very young age. This would add a new element to the Frozen world and also show how the family's powers are passed down.
There probably is. The Frozen fandom is quite large and diverse, so it's not surprising that there could be a fanfiction where Kristoff and Anna are pregnant. It could be an interesting read as it might explore how their relationship evolves with the new addition to their family on the way. Maybe it would also show how their friends in Arendelle react to the news.
One possible plot could be that Anna and Kristoff go on a journey to find a magical flower that is said to have the power to heal any ailment in the Enchanted Forest. Along the way, they face various challenges like wild animals and difficult terrains. They also have to deal with their own relationship issues as the stress of the journey tests their love for each other.
One possible plot could be that Anna discovers she's pregnant and she and Kristoff are overjoyed. But then they face challenges like how to keep Anna safe during her pregnancy in the sometimes - dangerous world of Arendelle. They might also worry about how to raise the child with all the responsibilities of ruling the kingdom.
Well, one theme is often the building of trust. Since Hans deceived so many in the movie, Kristoff might be hesitant at first. Fanfics could revolve around how they gradually build trust with each other. Also, there could be a theme of adventure. They might go on adventures together and through that, their relationship deepens. It could also involve the theme of self - discovery for both of them, as they learn more about themselves through their interactions.
In a fanfiction, their relationship could develop through a series of misunderstandings at first. For instance, Kristoff might misinterpret one of Elsa's actions as a sign of aggression when she was actually just trying to protect him. This causes some tension between them. But then, when they are faced with a real threat, like a powerful enemy attacking Arendelle, they realize they need to put their differences aside. They start to communicate better, and as they do, they find out they have a lot in common. Elsa realizes Kristoff's loyalty and kindness, and Kristoff sees Elsa's vulnerability behind her powerful exterior. This leads to a stronger and more meaningful relationship.