Well, Hiccup would probably be quite interested. He is always open - minded. He might find some of the creative ideas in the fanfiction inspiring. He could see new ways his relationship with Toothless or his role as a leader could be developed. Astrid, on the other hand, might be a bit more critical at first, but then also get into it if the fanfiction has a good story line. She would be looking for how accurately her character's strong - willed nature is represented.
Fanfiction about 'How to Train Your Dragon: The Hidden World' can offer unique perspectives and storylines. It often expands on the existing world and characters, giving fans more to enjoy.
You can try some popular fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just search for 'How to Train Your Dragon' and include 'trailer' in the search terms to narrow down the results.
You can start by familiarizing yourself with the original story and characters. That way, you'll better understand the sequel and appreciate the developments.
Honestly, there's not much of a direct relation. Maybe you could look at it from a perspective of fantastical creatures and spectacle, but even then, it's a loose connection at best.
One great fanfiction could be about a character reminiscing on their first time watching HTTYD 3. It might focus on how the movie inspired them to be braver in their own life, like facing their fears just as Hiccup did in the movie.
Watching the movie gives a clear framework and understanding of the world and characters. This helps writers build on existing elements and add their own twists. Also, it can fuel emotional connections that translate into more engaging fanfics.