Perhaps it could be an old acquaintance from his Hogwarts days. For example, a Ravenclaw girl he knew but never really got close to until later in life. Circumstances brought them together again, and they ended up having a child.
It could be a completely new character created for the fanfiction. Maybe a powerful witch who met Sirius during his time on the run. She could have been helping him and they fell in love, and then had a kid.
In some fanfictions, the mother could be a character that was only briefly mentioned in the original series. For example, it could be a witch he knew from his school days at Hogwarts. They reconnected later in life and had a daughter. Or, it could be a new character who has a special connection to the Black family, perhaps a distant relative who got closer to Sirius and they had a child together.
Another option is that the mother is a mysterious witch from a far - off land. Sirius might have met her during one of his travels when he was on the run from the Ministry. They had a short - lived relationship, and she left the baby with Sirius because she knew he was from a powerful wizarding family and could protect the child better in the wizarding world he knew.
Yes, in some fanfictions, Sirius Black is written as Harry's father. Fanfiction allows for creative reinterpretations of the original story, and this is one such interesting take.
Well, the plot could involve Sirius trying to protect his kid from the dark forces that are still after him. Maybe his kid has some special powers, like being able to communicate with magical creatures easily. And Sirius has to teach the kid how to control and use these powers without attracting too much unwanted attention.
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.
In some fanfictions, Sirius Black can be depicted as Harry Potter's father. Fanfiction often takes creative liberties with the original story, so it's not uncommon to see such radical changes in character relationships for the sake of exploring new storylines or emotional arcs.
One great Sirius Black father fanfiction is 'A Father's Redemption'. It shows Sirius trying to be a good father figure despite his difficult past. He learns how to take care of his child and protect them from the dark forces around. It's really heart - warming to see his transformation.
It could be an old flame that Bella had a brief relationship with. Maybe someone she met during a trip and then lost contact with until she found out she was pregnant.
The descendants of the Death Eaters would make great antagonists. They might still hold a grudge against Sirius Black for his actions against Voldemort and his followers. They could target his daughter to seek revenge or to prevent her from uncovering any secrets that Sirius might have known about them.
Annabeth could be the mother. Since she and Percy have a strong relationship in the original series, it's very likely that in a fanfiction they would have a child together. Their combined intelligence and Percy's powers would make for an interesting genetic combination for their child.