One possibility is that he would use his prior knowledge to prevent the tragedies that befell his family. He could also have a different dynamic with Sirius and Remus, as he'd be part of James' inner circle from the start.
Well, it could be that Harry, as James' brother, discovers that there were more secrets about his first life than he thought. Maybe he finds out that there was a hidden power within him that was never fully awakened in his previous life. This new discovery could change the way he approaches magic and his role in the fight against the Dark Arts, and it might also lead to a different ending to the battle against Voldemort.
In such a fanfiction, the plot could involve the brother having memories of a past life. This would lead to him guiding Harry in ways that Dumbledore or others couldn't. Maybe they'd explore new areas of the wizarding world that were previously unknown, all while trying to keep their relationship a secret from Voldemort and his followers. Their bond could be a key factor in the ultimate battle between good and evil in the wizarding world.
He might be more confident from the start. In his past life, Harry grew up without his parents and had a difficult childhood. But as James' brother, he would grow up in a loving family environment. This could make him more outgoing and less hesitant in social situations.
Harry's character would develop with a stronger sense of family pride. He'd be part of the Potter family in a different way than before. He would grow up with a different set of values, influenced by James and his parents. He could be more adventurous, knowing that he has a support system. Also, his understanding of the wizarding world would be more in - depth from the start. He might not be as naive as he was in his original life when it comes to the darker aspects of the wizarding world, because he already has the knowledge of what can go wrong.
Well, a really interesting plot could be set in a magical world where James has a special power that Harry doesn't understand at first. Harry then embarks on a journey to figure it out and in the process, they discover a long - lost family secret. It could also be a story about how they deal with the loss of a loved one together. Harry being the more emotional one and James trying to be strong for him. And then they grow closer through this difficult time.
One possible plot twist could be that Harry, as James' brother, has a different role in the fight against Voldemort. Maybe he's more of a behind - the - scenes strategist. Since he's in the family earlier, he could have different relationships with the other characters too. For example, his bond with Sirius might be even stronger as they grow up together more closely.
Well, in such a fanfiction, perhaps the story could start with Harry growing up in a world where the wizarding and spy worlds collide. Since he's the son of James Bond, he'd have access to some high - tech gadgets along with his magic. He might use a combination of these to solve mysteries within Hogwarts. For instance, a magical device from Bond's world could help him detect hidden passages that are also protected by magic. And his relationships with other characters would be interesting. His Gryffindor friends might be a bit in awe of his 'Bond - like' qualities, and he could also have some unique interactions with the teachers who would be both impressed and a bit wary of his unorthodox upbringing.
Well, one possible plot could be that Harry discovers his true heritage as Lucifer's brother. This could lead to a conflict within him as he tries to reconcile his life as a wizard with this new, dark family connection. Maybe he has to face some sort of magical or otherworldly council that is worried about the implications of having Lucifer's brother in the wizarding world.
One possible plot twist could be the way he, now she, interacts with the original male characters. For example, the dynamic with Ron and Hermione might change completely. Instead of a male - male - female friendship triangle, it could turn into a more complex female - male - female relationship. She might also face different challenges in Hogwarts, like dealing with gender - specific expectations in the wizarding world.
Well, he'd probably be more of a legacy student. He might be treated with even more respect or envy from the start. And he could have a different group of friends. Instead of Ron and Hermione, he might be closer to his brother's old gang, like Sirius and Remus, from the very beginning at Hogwarts.