It could be Sirius Black. He's a well - known Black family member in the Harry Potter universe. He has a rebellious nature which might attract Hermione. And his complex relationship with his family could add a lot of drama to the fanfiction as he marries Hermione.
It could be Sirius Black's younger sister who was not mentioned in the original series but is created for the fanfiction. She might have similar rebellious traits as Sirius but also her own unique charm that attracts Harry.
One possible plot could be that Hermione and the Black character initially face opposition from the wizarding society due to their different backgrounds. But through their love and determination, they break barriers. For example, they might have to deal with the prejudice of Hermione's friends at first, but as time goes on, everyone sees how much they truly care for each other.
In the context of the fanfiction, the Black sisters could be characters with their own unique personalities. They might be related to the well - known Black family in the Harry Potter universe, known for their pure - blood heritage. Each sister could have different magical abilities and outlooks on life.
One possible reason could be that Mrs Black's old - fashioned pure - blood views conflict with Hermione's more inclusive and progressive ideas. Hermione, being a Muggle - born witch, might not tolerate Mrs Black's snobbish and discriminatory remarks about non - pure - blood wizards and witches.
One possibility is that it could explore the complex family dynamics. Harry, being an outsider, would have to navigate the Black family's dark and proud history. Maybe he first befriends one sister and through her gets to know the others. It could also involve him using his own experiences of loss and friendship to heal the rifts within the Black family.
Well, perhaps it could involve Harry Potter breaking away from the traditional wizarding world norms. Maybe he meets a Black family member who is a strong and independent witch. They could bond over their shared experiences of dealing with the dark side in different ways. Their relationship might start with mutual respect and admiration, which then blossoms into love.
A plot could involve time - travel. Harry, for some reason, is sent back in time and meets a younger Narcissa. He gets to know her before she becomes involved with the Dark Arts. They form a bond, and as Harry tries to change the future to prevent some of the tragedies in the wizarding world, their relationship deepens. Eventually, they marry in this altered timeline, and Harry has to deal with the consequences of changing the past and his new relationship with Narcissa.
In this fanfiction scenario, their marriage might bring about some interesting cultural clashes. Harry is used to the wizarding culture with its own set of traditions like using wands, attending Hogwarts, and brewing potions. Natasha, on the other hand, is from a world of high - tech and espionage. But this difference could also be a source of attraction. They could learn from each other and create a unique family culture. For example, their children might be trained in both magic and combat skills, making them super - powerful hybrids in a way.
One plot idea could be that Hermione, being the intelligent and resourceful witch she is, gets inspired by Black Widow's combat skills. She might start training in a more physical and combat - oriented way, perhaps even creating her own spells that mimic Black Widow's moves. For example, she could develop a spell that allows her to move as stealthily as Black Widow. Then, she could use these new skills to protect Hogwarts during a new threat, something that the normal magical defenses can't handle alone.
One possible plot could be that Hermione finds herself in a world where she has to marry into the Black family for some magical political reason. Maybe she has to use her intelligence to navigate the complex family dynamics among the Black sisters. For example, she might have to deal with their different personalities and their expectations of her as a new member of the family. And along the way, she could be trying to find a way to still pursue her own goals in the wizarding world, like promoting the rights of non - pure - blood wizards within the rather traditional Black family.