Maybe in the fanfiction, Harry would develop a different set of skills. Since Sirius is brave and a bit of a rebel, Harry might learn some more unorthodox ways of using magic. And with Remus being very knowledgeable, Harry could be well - versed in magical theory at a young age. He could also grow up with a greater understanding of the darker aspects of the wizarding world, like the prejudice against werewolves, which would make him more empathetic.
One possible plotline could be that Sirius and Remus initially struggle with their inappropriate feelings towards Harry. They might then realize it's wrong and instead focus on their roles as his protectors. They could channel their strong emotions into teaching Harry more about his parents and the wizarding world, turning a potentially dark concept into a positive mentoring relationship.
One possible plot could be that Harry grows up with a stronger sense of family. Sirius and Remus would teach him about his parents more directly. He might be more confident in his magic earlier, as they could start his training sooner. Also, he'd likely have a different view of werewolves and Animagi from an early age.
One key plot element could be Harry growing up with a different set of values. Remus and Sirius, being outcasts themselves, might teach Harry to question authority more. He'd likely be more in tune with the magical world's underbelly from an early age. Also, his relationship with Hogwarts could be different. Instead of the sense of wonder and discovery as in the original, he might approach it with a more jaded view, having heard stories from Remus and Sirius about their own school days.
Another plotline could involve Draco's internal struggle. He is raised by Sirius, but still has the influence of his pure - blood Malfoy heritage. This could lead to a conflict within him. He might love and respect Sirius, but also feel the pull of his family's traditional values. This inner turmoil could drive the story as he tries to find his own identity, caught between two very different worlds.
A new storyline might involve Hermione exploring the secrets of her fathers. She could learn about Sirius' family secrets and Remus' experiences as a werewolf in a more personal way. This could lead to her finding new ways to fight against dark magic, as she combines the Gryffindor courage from Sirius and the Ravenclaw wisdom from Remus. It could also create a lot of drama as she tries to balance her old life with this new revelation of her parentage.
Well, perhaps in the fanfiction, Sirius would take Hermione on adventures around the wizarding world. Since he was part of the Marauders, he'd know all kinds of hidden places. They could visit ancient magical sites, and along the way, Sirius would share stories about her parents if he knew them. This would not only give Hermione a broader knowledge of the wizarding world but also a sense of connection to her past. Also, he might train her to be a better dueler, preparing her for any threats that come her way in the future.
One possible plotline could be that Krum, being a well - known Quidditch star, trains Harry in Quidditch from a very young age. Harry might grow up with a different set of skills and a more international perspective on magic due to Krum's Bulgarian background. He could also be introduced to different magical cultures earlier.
One possible plotline could be that Harry's grandfather imparts unique magical knowledge to him that he doesn't get at Hogwarts. Maybe it's an old - fashioned kind of magic that has been forgotten over time. This could give Harry an edge in dealing with the dark forces.
Harry's personality would develop in a very different way. Growing up with Sirius and Remus, he'd be constantly surrounded by tales of the Marauders. This would make him more mischievous in a good way. He'd have a better understanding of the grey areas in life, as Sirius has a bit of a wild side and Remus has his own struggles. Harry would also be more independent, as Sirius and Remus would encourage him to think for himself and not blindly follow rules. He'd be more likely to question authority, especially when it seems unjust. And his sense of humor would be more developed, as Sirius is known for his jokes and pranks. Overall, he'd be a more well - rounded and confident young wizard.
One great fanfiction on this topic is 'The Black Heir'. It delves deep into how Sirius would have raised Harry with a perfect blend of love and magic training. It shows Sirius teaching Harry about the Marauders' secrets and how to handle the challenges of the wizarding world from a different perspective than Dumbledore.