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.
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.
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, a plot might involve Harry - now James - trying to change the fate of his family. He could focus on protecting Lily in a different way than James did in the original story. Maybe he'd use his knowledge of magic from his past life to create new spells or defenses. Also, his relationship with Snape could be very different. Since he was Harry before, he might understand Snape's feelings better and try to make amends or change the animosity between them.
One possible plot twist could be that the twin brother has different magical abilities. For example, while Harry is known for his proficiency in Defense Against the Dark Arts, his twin could be a natural at Transfiguration. This would create an interesting dynamic as they could learn from each other in different ways. Another plot twist might be that the twin brother is initially hidden away for some mysterious reason, perhaps related to a prophecy that involves both of them. When he finally appears, it throws the wizarding world into chaos as everyone tries to figure out what his role is. And a third plot twist could be that the twin has a connection to Voldemort that Harry doesn't. Maybe he was unknowingly marked by Voldemort in a different way, leading to a race against time to figure out how to break that connection and save him.
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.
Well, a really interesting plot twist could be his relationship with the other Hogwarts houses. He might not have the same automatic connection with Gryffindor. Instead, he could be more inclined towards Slytherin values, which would completely change his dynamic with Ron and Hermione. Maybe he would form closer friendships with Slytherin students right from the start. Also, his views on pure - blood supremacy could be more complex as he is raised in a family that might have some traditional views on blood purity.
Well, perhaps the nuns are in cahoots with some magical creatures. They could be working with a group of centaurs who have prophesied that Harry must be raised in seclusion among the nuns to gain a certain kind of purity of spirit. Then, when Harry finally enters the wizarding world, he has an aura about him that both attracts and confounds the dark forces. He might also have a special connection to the magical animals due to his time with the nuns, like being able to communicate with them on a deeper level, which would be really useful in his battles against the dark side.
One plot twist could be that Harry's vampiric side gives him an unexpected advantage in fighting Voldemort. Maybe he can use his vampire speed to dodge curses better. Another could be that the wizarding world initially rejects him because of his Dracula heritage, but later realizes they need his unique powers. Also, it could be revealed that Dracula had some connection to the founders of Hogwarts long ago.
A really interesting plot twist could be that the phoenix, being a symbol of rebirth, has the ability to make Harry remember his past lives. This would give him an edge as he could draw on the knowledge and skills from his previous existences. He might remember spells and strategies that were long forgotten, which would completely change the course of his fight against the dark forces.
One possible plot twist could be that Malfoy's family initially objects to the adoption but then slowly comes to accept Harry. For example, Lucius Malfoy might see potential benefits in having Harry Potter, the famous wizard, in their family. Another twist could be that Harry, while growing up with the Malfoys, starts to influence them to be less prejudiced. He might introduce them to his friends from Hogwarts like Ron and Hermione, which would be a huge culture shock for the Malfoy family.