One possible plotline could be Harry using Mycroft's deductive skills to figure out the true nature of his parents' death earlier. He might not trust Dumbledore as blindly and instead start his own investigations.
In such a fanfiction, Harry might grow up with a high level of intelligence and deductive skills. Mycroft's influence could lead Harry to approach magic and the wizarding world in a more logical and strategic way, perhaps using his knowledge to solve magical mysteries that others overlook.
In some fanfictions, the plot could revolve around Snape teaching Harry about the Dark Arts in a way that Dumbledore never would. Harry might become more proficient in defensive spells against the Dark Arts but also be more exposed to the darker side of magic. This could create a moral dilemma for Harry as he grows up. Additionally, the relationship between Harry and Draco Malfoy could be completely different, as Snape's influence on Harry might make him less likely to be enemies with Draco from the start.
Well, it could start with Mycroft being lured into a trap and kidnapped. The kidnappers might be from a different dimension or have some sort of supernatural power. As the fanfiction progresses, Mycroft could use his wits to outsmart the kidnappers even while in captivity. There could be a lot of mind games and tense moments as he tries to escape or signal for help.
One plot idea could be that Mycroft Holmes, with his deductive skills, is brought into the wizarding world to solve a mystery that has stumped the Ministry of Magic. Maybe a series of strange disappearances are occurring at Hogwarts and Mycroft uses his Muggle - style investigation techniques to figure out that a rogue wizard is using a powerful charm to kidnap students for a dark ritual.
One possible plotline could be her discovery of magic in the dark and chaotic environment of Arkham. Maybe she has to hide her magic from the more sinister characters there. Another could be her forming an unlikely alliance with some of the inmates who have a sense of justice, and together they help her escape Arkham to find her place in the wizarding world.
Well, perhaps Harry would be more isolated in this fanfiction. Since Greyback is a feared werewolf, other magical beings might avoid Harry. This could lead to him developing a very self - reliant nature. He might also have a different view on magic. Instead of using it for good in the traditional sense, he could use it more for survival and protection, which would put him at odds with some of the more morally upright characters in the Potterverse.
Perhaps the story could focus on how Harry's grandmother's influence affects his relationship with magic itself. She might have a more old - fashioned view of magic, which could either clash or blend with the modern magic that Harry encounters at Hogwarts. For instance, she could have a preference for wandless magic, a skill she tries to teach Harry. This could set him apart from his peers and lead to some interesting scenarios in his classes. Also, his grandmother's stories about the family's magical heritage could inspire Harry to explore areas of magic that are not typically covered in the Hogwarts curriculum, such as ancient spells passed down through generations of his family.
Well, in the wizarding world, there are magical laws and rules like the Statute of Secrecy. In Mycroft's world, there are laws of the land in the Muggle sense. In fanfiction, they could interact in interesting ways. For example, if a magical crime was committed in the wizarding world but had implications in the Muggle world, Mycroft might have to work with the Ministry of Magic to keep things under wraps to avoid panic among Muggles. The Ministry might be hesitant to let a Muggle in on their secrets, but Harry could act as a liaison, trying to bridge the gap between the two worlds and their rules.
It would be really interesting. Harry might grow up with Sherlock's deductive skills. He could analyze the magic world in a more logical way. For example, when dealing with the mystery of the Chamber of Secrets, instead of just relying on the usual magic means, he might use Sherlock - style reasoning to find out who the heir of Slytherin is.
If Harry was raised in Japan, he could grow up in a world where magic is intertwined with Japanese mythology and culture. He might study at a Japanese wizarding school. His upbringing would expose him to things like Japanese magical creatures, which could be different from those in the UK. He could also have a different set of values instilled in him due to the Japanese cultural influence.