Well, it could also be Gale. Although Katniss has a more complex relationship with Peeta, her long - time friendship and some underlying feelings for Gale could potentially make him the father in a fanfic. It would add a whole new layer of drama to the story.
Perhaps the father is a new character introduced in the fanfiction. A rebel from a far - off place who came to her district and they fell in love at first sight. He could be on a mission related to overthrowing the remaining oppressive forces in the post - Hunger Games world and their love and her pregnancy add a new dimension to his mission.
While Peeta is the obvious choice, some fanfictions might explore the idea of Gale being the father. This could add a whole new layer of drama and conflict. Maybe there was a moment of passion between Katniss and Gale before she fully committed to Peeta, and this led to her pregnancy. However, this would be a more controversial take as it goes against the main narrative of Katniss's relationship with Peeta in the original series.
It could be her long - time boyfriend. They've been in a loving relationship, and the pregnancy was a natural progression of their relationship.
It could be Asuma. Given their relationship in the original story, it would be a logical choice. Their connection was strong, and they had a deep emotional bond. So, it would make sense for him to be the father in a fan - made pregnancy story.
It could be another powerful legendary Pokémon like Zekrom. Their opposing yet complementary natures could have led to a unique connection resulting in Reshiram's pregnancy.
It could be her long - time partner, if she has one in the original story. Maybe it's someone she's been in a committed relationship with for a while and they've been planning to start a family.
It could be an old flame of Lydia's. Maybe someone she had a passionate relationship with in the past and they had a brief reunion which led to the pregnancy.
The father could be a mysterious figure from her past. Perhaps someone she met briefly during a dangerous quest but had a deep connection with. This could add an element of mystery and intrigue to the fanfic as she tries to track him down to let him know about the pregnancy or he resurfaces unexpectedly.
The Capitol would definitely be a main antagonist. They are always trying to control the tributes and the Hunger Games. With Katniss pregnant, they might see it as an opportunity to manipulate the situation for their own entertainment or to quell any potential uprisings. President Snow could be especially cruel in this scenario, using Katniss's pregnancy to threaten her and those she loves.
One possible plot is that in a world where the Hunger Games are over but the after - effects still linger, Finnick and Katniss find solace in each other. Their relationship develops, and soon Katniss realizes she's pregnant. The story could then revolve around how they deal with this new situation. Finnick, with his charm and skills, might try to secure a safe place for them and the baby. Katniss, on the other hand, could be conflicted between her old self - reliant ways and the need to protect her unborn child. There could also be a sub - plot about how the other characters from the series react to this unexpected turn of events.