In some fanfiction, Balerion could be the key to unlocking an ancient mystery. For example, he might lead his rider to a hidden place that holds secrets about the origin of dragons. This would involve a lot of adventure and exploration, with Balerion's strength and knowledge guiding the way.
A great 'Game of Thrones' Balerion fanfiction could be centered around his relationship with other dragons. In the books and show, we don't get a lot of details about how the dragons interacted with each other on a deeper level. A fanfic could explore rivalries or alliances between Balerion and the other dragons. It could also show how Balerion's presence affected the behavior and growth of the younger dragons. This would add a whole new dimension to the dragon lore in the 'Game of Thrones' universe.
Obviously, Balerion himself is a main character. His rider, if mentioned in the particular fanfiction, would also be a key character. Often, other dragons might also be important, like Vhagar or Meraxes if the story is set in a world where all the great dragons co - exist.
I can't specifically name one off the top of my head, but a good fanfiction would likely be one that gives Balerion a unique personality. It could show his intelligence and his own desires, rather than just being a tool for war. For example, a story where he rebels against his rider's commands in order to protect something he values, like a particular area of Westeros that he has a connection to.
Wei Yuan died in the 241st chapter of the book.
While waiting for the TV series, you can also click on the link below to read the classic original work of "Dafeng Nightwatchman"!