Perhaps his adopted mother is a Muggle with a special connection to the magical world. She raises Harry in a Muggle - like environment but also imparts some ancient magical wisdom she's inherited. This would create an interesting dynamic where Harry has to balance his two different worlds even more so than in the original story.
Perhaps Harry is adopted by a Muggle family who are aware of the wizarding world. They could be a family of scientists who study magic from a scientific perspective. Harry would grow up with a unique understanding of magic, seeing it both as a wonder of the wizarding world and something that can be analyzed. This might make his time at Hogwarts very interesting as he tries to blend these two views of magic.
Another plot could be that Naruto's adopted mother is secretly related to one of the main antagonists. She has to hide this fact from Naruto while also trying to guide him to be a great ninja. This creates a lot of internal conflict for her and also adds an interesting layer of mystery to the story as Naruto might start to notice some strange behavior from her.
Another plot could be that the OC is an outcast in the wizarding world due to their unorthodox magical abilities. They see Harry as a kindred spirit. When they adopt him, they take him on a journey to discover the true nature of magic, which is different from what is taught at Hogwarts. This could involve exploring hidden magical realms and learning from magical creatures that are not well - known in the wizarding community.
A possible plot in this female Harry Potter adopted fanfiction could be that she's adopted by a foreign wizarding family. They introduce her to different magical cultures and traditions. For example, she could learn about Asian magic, with its focus on balance and harmony. This would make her a more well - rounded witch. Her adopted family might also have a secret grudge against Voldemort, which adds another layer to the story. As she grows up, she uses her combined knowledge of different magics to fight against the dark forces in the wizarding world, all while dealing with the fact that she's not like other wizards due to her adoption.
In the 'Harry Potter adopted son of vixen fanfiction', it's possible that the vixen is part of a long - forgotten magical race. Harry, as her adopted son, might be caught in the middle of a power struggle between this race and the traditional wizarding world. He could be the key to bringing peace or might have to fight to protect both his new family and his friends at Hogwarts. His vixen - influenced nature might make him more attuned to nature - based magics, which could set him apart from other wizards.
Well, in such a fanfiction, it might be fascinating to see how the relationships with his original friends, like Ron and Hermione, are affected. Since his family situation has changed, perhaps their interactions become more complex. For example, they might have to deal with a new 'Harry' who has different priorities due to his new family.
Well, perhaps Harry is adopted by a family of magical creatures, like centaurs. They teach him their unique ways of magic and understanding of the magical world. He could have a whole different perspective on things like divination, as centaurs are known for their prophetic abilities. It would be really interesting to see how he interacts with his human friends at Hogwarts after growing up in such a different environment.
One plot idea could be that Bellatrix has a change of heart early on. Maybe she realizes the error of Voldemort's ways and decides to protect Harry instead. She could use her knowledge of the Dark Arts to shield him from other Death Eaters. Another idea is that she has a secret past relationship that led to Harry being her son, and she has to hide this from Voldemort while trying to raise Harry in the wizarding world filled with danger. And a third idea could be that Bellatrix is forced to be Harry's mother against her will initially, but then grows to love him in a strange, complex way as she sees his potential and the good in him.
One idea could be exploring the magical preparations that took place before his birth. Maybe there were ancient spells cast to protect him. Another could be focusing on his parents' emotions during that time. For example, how Lily was feeling knowing Voldemort was a threat. And perhaps a plot where the wizarding community was secretly planning something in case Voldemort attacked right after Harry was born.
One plot idea could be that Jasmine Potter has a special power that Harry doesn't. For example, she can communicate with magical creatures in a unique way. This power could lead her to discover a hidden secret about Hogwarts that's crucial for the fight against Voldemort.