A cool plot could be that for the 100th Hunger Games, the Capitol decides to bring back former victors as tributes. This forces the old victors to fight again, and it creates a lot of drama. There would be a lot of backstories and grudges from their previous experiences in the games that could play out in new and unexpected ways.
One idea could be a revolution within the 100th Hunger Games. The tributes from different districts secretly plan to overthrow the Capitol's control over the games. They start by forming alliances not just for survival but to spread their message of resistance among the other tributes.
One idea could be a tribute who has a unique survival skill like being able to communicate with animals in the arena. They could use this to gather information about hidden resources or approaching threats.
One idea could be focusing on a new type of arena. For example, an arena that changes based on the tributes' worst nightmares. This would add a psychological twist to the games.
One idea could be to focus on a new type of arena, like an underwater arena. The tributes would have to deal with things like limited air supply and underwater predators. Another could be a tribute from a previously overlooked district who has some unique skill, like being able to communicate with animals, which gives them an edge in the games.
Another plot could revolve around the Capitol's perspective. Show how the Gamemakers manipulate the Games, not just in terms of the physical challenges but also in influencing the tributes' mental states. For example, they could use propaganda within the Capitol to create more hype around certain tributes.
One idea could be a story focusing on an underdog tribute who has a unique skill like being able to communicate with animals. They use this skill to survive in the arena, forming alliances with the creatures there. Another could be about a group of tributes from a previously overlooked district who band together and use their collective knowledge of their district's unique environment to outwit the others. Maybe a story where a tribute is haunted by the ghosts of past Hunger Games participants, and has to overcome both the physical challenges of the arena and the psychological ones of these apparitions.
One idea could be to focus on a new type of arena. For example, an arena that changes based on the emotions of the tributes. If a tribute feels extreme fear, the part of the arena they are in could transform into a more dangerous place. Another could be to have an alliance of underdog tributes who use their unique skills, like one being great at camouflage and another at finding water, to outwit the stronger tributes.
Another plot could be about a group of tributes who form an alliance not just for survival in the arena but also with the intention of overthrowing the Capitol's control over the games. They could use their skills and the element of surprise to try and expose the cruel system from within the Hunger Games itself.
One idea could be exploring the lives of the victors after the games in more depth. Maybe show how they deal with the trauma and how their relationships change. Another could be creating an alternate ending to the 4th Hunger Games, where different tributes win. Or perhaps a story about a new rebellion starting from the events of the 4th book.
One idea could be to focus on a character who has been secretly trained for years in a unique combat style and uses it to their advantage in the Games. For example, a character who has mastered the art of using a slingshot with deadly accuracy, taking out opponents from afar.
Another interesting angle is to explore the backstories of the Gamemakers for the 50th Hunger Games. What led them to design the particular challenges in the arena? Were there any internal conflicts among them? This could provide a deeper understanding of the whole Hunger Games concept in the context of this specific event.