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.
Peeta would be devastated. He might feel a mix of anger and sadness. Anger at the Capitol for creating the situation where Katniss had to sacrifice herself, and sadness at the loss of the girl he loved. He could also become more withdrawn, less likely to trust others in the Games. But at the same time, he might find a new strength within himself, inspired by Katniss's selfless act.
She might be amused. Fanfiction often takes the original story in new and unexpected directions. Katniss could find it interesting to see how others view her world and her character.
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.
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.
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.
A fanfiction that stands out is 'The Everlark Chronicles'. It follows Katniss and Peeta's relationship from the start of the games all the way through their married life. It has some really heart - warming moments. 'Surviving the Aftermath' is also great. It focuses on how they deal with the political unrest in Panem after the games, and how their love for each other becomes a source of strength in those difficult times.
One great 'Katniss Peeta Hunger Games' fanfiction is 'Everlark's New Beginning'. It shows a post - Hunger Games world where Katniss and Peeta are rebuilding their lives together. It's full of sweet moments between them and really captures the essence of their relationship.
In a darker fanfiction, Katniss could be assassinated. The Capitol, still angry about her rebellious acts, sends a highly skilled assassin. The assassin manages to infiltrate District 12 and kill her in her sleep. This would lead to a huge uprising as Katniss was seen as a symbol of hope for the districts.
Prim is another character that shows up a lot. Fanfiction might focus on how Prim's relationship with Katniss affects Katniss's decisions during the games. For example, some stories could explore how Katniss's drive to protect Prim influences her actions towards Peeta, whether she sees Peeta as a threat or an ally in relation to Prim's safety.
A plot could be that their baby has some special abilities. Maybe it has an uncanny ability to sense danger, which is both a blessing and a curse. Peeta and Katniss have to figure out how to help their child control this ability while also keeping it a secret from those who might want to use the baby for their own gain. It could lead to a series of adventures as they move to different districts to keep the baby safe.
One interesting fanfiction could be about Peeta and Katniss' life after the games in a peaceful district. They could be rebuilding their community and dealing with the emotional scars of the Hunger Games together.