One idea could be exploring what would happen if Tris survived the final battle and had to rebuild the society in a completely different way. Another could be a story from Four's perspective during his early days in Dauntless before Tris arrived.
A great idea for Divergent Trilogy fanfiction could be to delve deeper into the backstories of the secondary characters. For example, Uriah's life before he joined Dauntless. You could explore his family, his dreams, and how his experiences shaped him into the person we see in the original trilogy. This would add more depth to the overall Divergent universe and might also create new plotlines and relationships within the fanfiction.
A cool fanfiction idea could be that the world of Divergent and the Hunger Games are actually two parts of a bigger experiment. The main characters from both universes start to discover this connection during a Hunger Games where some strange, Divergent - like abilities start to show up among the tributes, and they have to figure out what's really going on.
One interesting idea could be exploring the backstory of the scar in more detail. Maybe it has a hidden significance related to the Divergent world's secrets.
One interesting idea could be the integration of the faction system from Divergent into Hogwarts. For example, students might be sorted not only by houses but also by factions, leading to new social dynamics and conflicts. Another idea could be characters from Divergent having magical abilities in the Harry Potter world, and how they would use those abilities in the context of the wizarding world's rules and challenges.
One interesting plot could be a crossover where characters from Harry Potter and Divergent meet in a new, magical - yet post - apocalyptic world. For example, Hermione could use her knowledge to help Tris understand the complex political and magical systems. Another idea might be a story where the sorting hat is introduced to the Divergent factions and has to sort the characters based on their personalities.
One idea could be exploring a different faction's perspective in more depth. For example, showing the daily life and hidden secrets of the Amity faction. Another could be creating a new character who has unique abilities and seeing how they fit into the Divergent Games world.
One idea could be that Four's little sister discovers a hidden power within herself that is different from the factions' norms. For example, she might have an ability to sense when people are lying in a world where truth is highly valued in different ways among the factions.
One idea could be a crossover where characters from the Underworld and Divergent universes have to team up. For example, Selene from Underworld and Tris from Divergent might find themselves in a situation where they need to combine their skills to fight a common enemy. Maybe a new vampire - faction hybrid is created that threatens both of their worlds, and they have to figure out how to stop it.
One idea could be that the characters from Divergent are magically transported to the wizarding world of Harry Potter. They could be sorted into Hogwarts houses based on their Divergent faction traits. For example, the Dauntless might be sorted into Gryffindor for their courage.
One idea could be exploring the backstory of the little soldier in the Divergent universe more deeply. Maybe they were part of a secret military project within the factions. Another could be a love story where the little soldier falls for someone from a different faction, which challenges the norms of the Divergent society.
Well, you could write a fanfiction where the characters from the 13 Treasures Trilogy end up in a modern - day setting. Imagine how they would react to things like cell phones and cars. Or, a story that focuses on the relationship between two characters that was only hinted at in the original books. It could also be cool to create a new adventure for the characters that involves a previously unknown threat to the treasures.