One possible antagonist could be a jealous sorcerer. He might be envious of Hiccup and Elsa's relationship and the power that their unborn child is said to possess. So he tries to harm Elsa during her pregnancy to stop the child from being born. Another could be some of the traditionalists from their respective kingdoms. They don't approve of their relationship and see the pregnancy as a threat to their old ways. They might try to separate Hiccup and Elsa, which would put Elsa's pregnancy at risk.
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.
Their relationship might start with curiosity. Hiccup would be curious about Elsa's ice powers and Elsa about Hiccup's connection to dragons. As they interact more, they start to respect each other's abilities and personalities. This mutual respect turns into friendship, and then gradually into love. The news of the baby would strengthen their bond as they now have a shared future to look forward to. They would support each other more, with Hiccup protecting Elsa during her pregnancy and Elsa using her powers to help Hiccup in his adventures.
One possible plot could be that Hiccup, while on a journey with Toothless, somehow gets transported to Elsa's world. He stumbles upon Elsa as she is trying to control her powers in a difficult situation. Hiccup, with his experience dealing with dragons, offers her a different perspective on handling her powers. They gradually grow closer as they share their stories and in a moment of deep connection, they share a kiss.
There could be. Fanfiction is a very creative space, and given Elsa's popularity from 'Frozen', some fans might have written stories where she is pregnant. You can try searching on major fanfiction platforms. Just be aware that not all of them may be well - written or in line with the original spirit of the character.
Well, it's possible that such a fanfiction exists. Elsa and Jack Frost are from different fictional universes (Elsa from Frozen and Jack Frost from Rise of the Guardians), but in the world of fanfiction, people often cross over characters and create all kinds of scenarios. However, I haven't personally come across a 'pregnant' fanfiction involving them. You might have to search on some dedicated fanfiction websites to find out for sure.
There may be some extremely creative and boundary - pushing fanfiction out there with this premise, but it's not something that is typically found in the more well - known or widely - accepted "How to Train Your Dragon" fanfiction. Usually, fanfictions in this fandom focus on things like their adventures, friendship, and the development of their bond in a more traditional sense. So, while it's possible, it's not a common plot line.
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.
Hiccup is adventurous and curious. He would be intrigued by Elsa's ice powers and her reserved nature. Elsa, on the other hand, is cautious and has been through a lot with her powers. Hiccup's boldness might initially make her a bit uncomfortable, but his kindness would draw her in.
Well, perhaps Hiccup would be really nervous when meeting Elsa's parents. He might show them his dragon - riding skills to prove he's worthy. Maybe they would initially be skeptical of him because he comes from a different world with dragons, but then come to see his good heart.