If Hermione was Regulus's sister, they would likely have a very protective relationship towards each other. Regulus, being involved in the dark side initially, might be constantly worried about Hermione getting caught up in the danger. Meanwhile, Hermione would be trying to save Regulus from the clutches of Voldemort. They would probably have secret meetings to discuss their different worlds and how to bridge the gap between them.
It's possible that their relationship would be based on mutual admiration. Hermione would admire Regulus for his courage in the end when he turned against Voldemort. And Regulus would admire Hermione for her academic achievements and her ability to stand up for what she believes in. They could be like a secret alliance within the Black family, working together to undermine Voldemort's plans from different angles.
Their relationship could be quite complex. Regulus was a Slytherin and Hermione a Gryffindor. There might be some initial conflict due to their house differences. But since Hermione is so intelligent and open - minded, she would probably try to understand Regulus's motives and actions. And Regulus, seeing Hermione's strong moral compass, might grow to respect her a great deal.
If Hermione were Regulus's sister in fanfiction, it would likely lead to a different kind of relationship with Sirius. Instead of just being friends with Harry who is related to Sirius, she would have her own family connection. This could also mean that she might have some knowledge about the family's dark past that Sirius didn't share with her in the original story, which could be used to her advantage in various situations.
Well, Hermione being James' twin sister would make her and Sirius have a tight - knit relationship. Sirius would be part of her family in a way. He'd be there for her during her Hogwarts years, and they could bond over their shared love for James. Sirius might also teach Hermione some of the more secretive and dangerous spells that the Marauders knew, and Hermione would keep Sirius in line with her logical thinking and rules - following nature, creating a balanced and loving relationship.
Their relationship would be complex. Remus, being older, would probably be very protective of Hermione. He would want to shield her from the hardships he faced as a werewolf. Hermione, on the other hand, would look up to Remus and his intelligence. She would likely pester him with questions about magic and the wizarding world, and Remus would patiently answer. They would share a bond of family that would be unbreakable, and they would support each other through tough times at Hogwarts and in the fight against the Dark forces.
It would be really complex. Draco would probably be initially very confused and maybe a bit resentful. He's been brought up with certain ideas about pure - blood superiority and Hermione being a 'Muggle - born' (in the original context). Now, if she's his aunt, he'd have to re - evaluate his views. He might also be jealous of Hermione's intelligence and the fact that she doesn't conform to the Malfoy family's more rigid ways.
It could be really interesting. Maybe they discover their relation later in life. Hermione's intelligence combined with Severus's complexity would make for a great dynamic.
It could be a relationship full of secrecy. Since Hermione is a Muggle - born in the eyes of most of the wizarding world and Narcissa is from a pure - blood family. They might have to keep their sisterhood a secret to avoid scandal. They could communicate in hushed tones and have secret meetings, slowly building a bond based on mutual understanding and the fact that they are family despite all the differences.
Yes, there are likely fanfictions out there with such a plot. Fanfiction writers often come up with creative and alternative family relationships for characters. They might explore how Hermione's story could be different if Regulus were her father, perhaps delving into how her magical abilities or her place in the wizarding world might be affected by this new family connection.
They'd likely have a complex relationship. At first, they might be at odds because of their different initial beliefs. Draco's brought up in a family with pure - blood - centric views, while Hermione is a Muggle - born who believes in equality. But as they grow, they could start to understand each other more. There could be a lot of sibling banter, with Draco teasing Hermione about her Gryffindor friends, and Hermione pushing Draco to be a better person.
She might have access to unique Black family resources. For instance, she could find a hidden Black family library filled with dark arts books (which she would use for good, of course). This would give her an edge in her studies and in fighting the Dark forces.
It would have a huge impact. For starters, Hermione's relationship with Harry and Ron would be re - examined. She might have different loyalties or secrets she's been hiding. Her skills and knowledge could also be related to her new heritage. For example, she might have an in - depth understanding of Regulus's knowledge of the Dark Arts, which could help in fighting Voldemort.