Obviously, Rue is one of the main characters as she is the Mockingjay in this fanfiction. There might also be characters from the original Hunger Games series who support Rue in her new role, like some of the tributes who survived and are now part of the rebellion.
Rue could be the key to a rebellion in a fanfiction. After her death in the original story, her spirit could inspire the other districts. So in this fanfiction, she doesn't die. Instead, she unites the tributes from different districts against the Capitol. Her small and innocent appearance could be a disguise for her strong will and leadership skills.
If Rue won, it could lead to a very different outcome. Maybe it would inspire more rebellion or bring about a shift in the Capitol's control. It's an interesting 'what if' scenario that opens up a lot of possibilities for the story to unfold differently.
In some fanfiction, Rue could have a connection with the Capitol that is not shown in the original. Maybe she has a distant relative who is trying to help her from the inside. This relative sends her small gifts or hints during the Games that give her an edge. It would add an interesting twist to her story and show a different side of the power dynamics in the Hunger Games universe.
In many Hunger Games fanfictions, Katniss and Rue's relationship is often one of mutual trust and sisterly affection. Katniss sees Rue as a symbol of innocence in the cruel Games. Rue, on the other hand, looks up to Katniss as a protector. Their bond is strengthened by their shared experiences in the arena.
One common theme is friendship. Fanfictions often focus on how Katniss and Rue form a deep friendship in the harsh environment of the Hunger Games. Another theme is sacrifice. Rue's selfless act in the original story can be further explored in fanfiction, like Katniss's reaction to it and how it shapes her later actions.
One interesting idea could be Rue's different strategies as the Mockingjay. Maybe she uses her small and nimble stature in ways Katniss didn't. For example, she could be more stealthy in getting in and out of dangerous areas.
Rue represents the truth of the underdog in the Hunger Games novel. She comes from a small and relatively powerless district. Despite her size and lack of resources, she has a strong spirit and survival skills. Her presence in the Games shows that the Capitol's system doesn't always favor the strong or the well - equipped. Her death also reveals the truth that the Capitol doesn't value the lives of the tributes equally, but rather sees them as disposable pawns for their entertainment.
Peeta would be heartbroken. He had strong feelings for Katniss, so her death would be a huge blow. He might become more determined to win the Games in her memory, to carry out whatever she might have wanted in the Games.
It could have a huge impact. The tributes from Rue's district would probably be deeply moved. They might see Katniss as a hero for giving her life for Rue. And it could change the way the remaining tributes interact with each other. Maybe some would form alliances out of respect for Katniss's sacrifice, or some might be more hesitant to engage in violent acts against those who were close to Katniss.