Perhaps the new girl is from a district that was thought to be weak in the Hunger Games. But she surprises everyone. She could start a revolution within the arena, inspiring other tributes to fight against the Capitol's cruel rules. She might use her charm and wits to get sponsors on her side, who send her useful items during the games.
One idea is that the new girl has a connection to a past Hunger Games victor. This connection is discovered during the games, and it makes her a target. However, she uses this knowledge to her advantage. She could also have a special relationship with the Gamemakers that she uses to manipulate the events in the arena in her favor.
Well, it could be a story centered around a character from District 5 who works at the dam. This character discovers a secret about the dam, like it has a hidden function that could either save or destroy the district. And the whole story could be about how they deal with this discovery, whether to share it or keep it hidden for the greater good of the district.
One possible plot could be that the Capitol decides to change the rules completely. Instead of individual tributes from each district, they make it a team - based Hunger Games. Districts have to send pairs of tributes. So, two tributes from District 5, for instance, who are siblings, are sent. They have to rely on their strong bond and complementary skills. One is good at strategizing and the other at physical combat. They face off against teams from other districts who have their own strengths. As the Games progress, they discover that there are hidden alliances among some of the Capitol - favored teams, and they have to expose this to gain an upper hand.
The new girl herself would be a main character, of course. She could be named something like Ava. There might also be a male tribute from a different district, like Finn, who becomes her ally. And the Capitol's representative, like Seneca Crane, could also be a significant character as he tries to control the games and the new girl's fate.
In this fanfiction, Cato might have a secret plan. He could pretend to be weaker than he actually is in the beginning to lure other tributes into a false sense of security. Then, when they least expect it, he strikes. His victory could also lead to a change in how the Capitol views the games, as his win was so dominant.
It could be about a tribute with a burning desire for revenge. Their family was wronged by another district, and they see the Hunger Games as the perfect opportunity to get back at them. But as the games progress, they start to realize the futility of revenge and the real enemy is the Capitol.
A possible plot could be Cressida's secret mission. She is sent by the rebels to infiltrate the Capitol's elite art circles. There, she discovers a plot by the Capitol to use art as a form of mind control. She has to find a way to expose this while still maintaining her cover.
Well, it could be about a wedding that takes place within the Hunger Games universe. Maybe two tributes fall in love during the games and then have a grand wedding after they somehow survive. Or perhaps it's a wedding of a Capitol citizen who is really into the Hunger Games and wants a Hunger Games - themed wedding.
Well, a plot twist could be that Haymitch is secretly in love with a Capitol citizen who is somehow involved in the Hunger Games. This would create a lot of internal conflict for him as he has to fight in the games while also dealing with his feelings for someone on the other side. Also, it could be that Haymitch's family has a hidden past related to the Capitol that is revealed during the 50th Hunger Games. This could put him in a difficult position as it might change the way the other tributes and the Capitol view him.
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.
A great plotline for Hunger Games Mockingjay Epilogue Fanfiction could be about the exploration of the outside world. Maybe there are other areas beyond Panem that they discover. It could also center around the development of new technologies in Panem as they strive to move forward. The relationships between different districts could be further explored as well. For instance, how they trade, communicate, and interact with each other on a more equal footing now.