She could be involved in a plot to reform the faction system from the inside. Maybe she teams up with some like - minded individuals, including some from other factions, to bring about a more harmonious and inclusive society in the Divergent world. This would put her in a position where she has to face many challenges and opposition from the traditionalists.
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.
It could be a power - hungry faction leader who sees Four's little sister as a threat to his or her authority. Since Four is already a well - known figure, the sister might inherit some of his influence, and this leader would want to stop her from causing any changes in the established order.
In fanfiction, Eric's little sister could be portrayed in various ways. She might be a rebel against the strict regime that Eric is often associated with in Divergent. Maybe she has a secret Divergent identity and is trying to hide it from her brother, who is a prominent figure in the faction system.
In some fanfictions, she could be a victim of the faction system in a way that Eric doesn't fully understand. This could create a rift between them as she struggles with her own identity and the expectations placed on her because of her brother's position. It could also be a story of her finding her own voice and fighting for what she believes in despite the obstacles.
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.
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.
One idea could be that Harry's little sister discovers she has a unique magical power that no one else in the family has. Maybe she can communicate with magical creatures in a way that even Hagrid is impressed by.
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.
Well, a great plot could be that Percy's mortal sister is being targeted by a minor villain from the demigod realm. This villain thinks that by getting to her, they can get to Percy. So, Percy has to protect her while also trying to keep her in the dark about his world as much as possible. But as time goes on, she starts to piece things together. She could also make friends with some of the less powerful demigods who are more in touch with the mortal world, and they help her understand and deal with the situation.
One idea could be that Percy's little sister discovers she has a unique power that even Percy doesn't have. For example, she can communicate with the spirits of the old gods that have long been forgotten. This could lead to her going on a secret adventure to find out more about these ancient deities and how they can help in the fight against the new threats.