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.
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.
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.
In 'The Hunger Games', the antagonist is President Snow. His actions and decisions are at the core of the story's tension and opposition. He is determined to keep the districts in subjugation and will do whatever it takes to maintain his rule.
Gale Hawthorne is an important character too. He is Katniss's friend back in District 12. He has strong opinions about the Capitol and is involved in the resistance against it, which is related to the overall Hunger Games stories as the games are a tool of the Capitol's oppression.
Haymitch Abernathy is a key character. He is a former Hunger Games winner and becomes a mentor to Katniss and Peeta. President Snow is also significant. He represents the power - hungry and cruel leadership of the Capitol.
Sure is. The Hunger Games is a work of fiction that imagines a fictional future and the challenges and adventures within it. It's not based on real events or people.