Some fanfictions might have a plotline where the main character tries to avoid the reaping in creative ways. Maybe they fake an illness or try to bribe the Peacekeepers. It adds an exciting twist to the story. There could also be a plotline where the reaping is a setup by a group of rebels to start a revolution in the districts.
One plotline could be a tribute from District 4 who uses their knowledge of water currents and marine life to create elaborate traps in the arena. For instance, they could use a school of fish to lead other tributes into a dangerous area filled with quicksand - like patches near a water source. This would be a unique take on survival strategies specific to District 4's skills.
One possible plotline could be the characters having to form alliances not just for survival in the games but also to ensure a successful 'marriage' within the new rules. For example, they might have to prove their compatibility through various challenges.
One interesting plotline could be an alternate version of their time in the arena. Maybe they find a hidden part of the arena that has some kind of special power or resource that changes the game completely. For example, a place with healing waters that not only heals their physical wounds but also gives them some mental clarity, allowing them to outwit the other tributes more easily.
One interesting plotline could be Peeta and Katniss having to survive in a different kind of arena that has unique challenges not seen in the original games. Maybe it's an underwater arena where they have to figure out how to breathe and find food. Another could be a plot where they secretly raise a rebellion within the Capitol itself instead of just in the districts.
In some fanfiction, a great plotline is that Peeta and Katniss are forced to participate in a special Hunger Games - like event again, but this time it's more of a political ploy. They have to outwit the Capitol in different ways than before. Maybe they form alliances with unexpected people from other districts and find new ways to resist the Capitol's tyranny while also dealing with their complex feelings for each other.
Another option is to check out Tumblr. There are often communities dedicated to Hunger Games fanfiction. You can search for posts about'reaping' fanfics or ask the community for recommendations.
I'm not entirely sure as the book may introduce new characters, but we can expect to see some familiar faces from the Hunger Games series. There could be the tributes from different districts, and perhaps the families of those tributes.
One unique plotline could be Prim being chosen for the Hunger Games instead of Katniss. This would completely change the dynamic as Prim is much more gentle and less trained for combat. Another could be Prim having a special connection with the Capitol's secrets, like she discovers a way to bring down their defenses through her knowledge of plants, which she uses as medicine in District 12.
One common plotline is Cashmere's backstory. Writers may explore her life in the Capitol before the Games, her training, and how she became a Career Tribute. For instance, they might describe how she was groomed from a young age to be a competitor in the Hunger Games, and the pressures she faced to uphold the Capitol's standards of beauty and strength.
One possible plotline could be exploring the long - term effects of the games on the districts. For example, how the rebuilding process is going and if there are still any remnants of the Capitol's oppression. Another could be focusing on the characters' personal lives. Maybe Katniss and Peeta's family life, like how they raise their children in a post - war world.