It could also be a result of some sort of scientific experiment gone wrong. If the fanfic is set in a sci - fi context, this could be an interesting twist where the pregnancy is not a traditional one.
It could be a well - known character from the original story that Bella was involved with. For example, if it's related to a Twilight - like universe, it might be Edward. His reaction to Bella's pregnancy and how he interacts with Alice Rose in this context could be an interesting part of the fanfiction.
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.
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.
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.
Obviously, Bella herself. And her partner, who could be someone she's in a committed relationship with. Her family members like her parents or siblings might also be important characters. They could be there to support her or add some family - related drama to the story.
It could be her existing partner from the original story. For example, if it's a story where she's in a relationship with Edward, then he would be the likely father.