There's a wide range of stuff. You might find alternate storylines where characters from both universes interact in unexpected ways or romantic pairings that aren't in the original works.
Harry Potter and How to Train Your Dragon slash fanfiction can have all sorts of things. Maybe it's about friendship between characters from both worlds, or it could involve epic battles with a combined magic and dragon power twist.
There are various fanfictions that imagine Vikings interacting with the world of How to Train Your Dragon. Some might focus on friendship, while others could explore adventure or romance.
You can find all sorts of storylines. Some might focus on the characters' adventures after the events of the movies, while others might explore alternate universes or prequels.
You might find a variety of slash fanfictions that explore romantic or intense relationships between characters from both universes. Some could be very creative and unexpected!
You might find crossovers where characters from both universes interact in unexpected ways. Maybe a dragon rider shows up in Westeros or a Game of Thrones character discovers a dragon egg in the land of Berk.
You might find various stories. Some could focus on new adventures of the characters after the original movie, while others might explore alternate timelines or relationships.
There are all sorts of storylines. Some might focus on the adventures of the dragon eggs, while others could explore the mystery behind their origin.
There are various fanfiction stories. Some might focus on the adventures of the characters after the events of the movie, while others could explore alternate storylines or relationships.
You could start by creating a magical portal that connects the two worlds. Then, have characters from each story interact and face challenges together. Maybe a dragon helps Harry in a Quidditch match!
One common theme is friendship. Both universes have strong bonds between characters, and fanfics often explore those friendships in new and interesting ways.
Often, themes like friendship, adventure, and personal growth are common. Elements like new dragon species or expanded backstories for characters are frequently seen.