Ron could be the father. Given their relationship in the original series, it would be a natural choice. They could have gotten married and had a son. Ron's laid - back nature might contrast with Hermione's more serious side when it comes to parenting their son.
It could be Harry. In some fanfiction, there are alternate relationship dynamics. Harry and Hermione might have developed a relationship later on, and their combined magical power and heroic natures could be passed on to their son. Their son would then have a huge legacy to live up to.
Another option is that the father could be Harry, but in a very different and alternative take on the story. Maybe there was a situation where they got closer than friends during a difficult time and it led to the baby. However, this would be a very radical departure from the original relationships in the series.
Another possibility is Harry Potter himself. This would be a very different take on their relationship. In some fanfiction, the strong bond between Hermione and Harry could be taken to a new level. Maybe in a situation where they are the last hope for the wizarding world, they conceive a child in secret to carry on some special magic or power that could save the wizarding community.
It could be Ron. Maybe they had a falling out or some complicated situation that led to Hermione keeping the baby a secret from him.
The plot might involve Hermione's son being sent back in time accidentally. He then has to navigate the past, which includes meeting a younger version of his mother. This could lead to all sorts of interesting situations where he has to be careful not to change the future while also trying to find his way back to his own time. And Hermione in the present is desperately trying to find a way to bring him back.
It could be Ron. Since they have a relationship in the original story, it's a very likely option. Their relationship could be further developed as they face the new chapter of becoming parents together.
Perhaps it could be a new character. A mysterious wizard who comes into Hermione's life, and they fall in love and have a child. This would add an element of newness and mystery to the fanfiction, as the readers would get to learn about this new character and his relationship with Hermione.
It could be Ron Weasley. In many post - war fanfictions, Ron and Hermione get married and have children. Ron would be a great father, teaching the kid about wizarding traditions and Quidditch, while Hermione focuses on academics.
One possibility could be Ron. They have a long - standing relationship in the original series, so it would be a natural choice. Their relationship has its ups and downs, and a pregnancy could be a big turning point for them.
It could be Ron. Maybe they had a falling out or some sort of misunderstanding during their relationship, and Hermione runs away when she discovers she's pregnant. Another possibility is that it's a new character, someone she met during one of her adventures or studies. This new character could be from a different magical culture, and their relationship was a secret.
The father could be John Smith. Their relationship in the original story was complex and having a baby together would add a new dimension to their story. It would also explore how they navigate parenthood given their different backgrounds.