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.
He would probably be highly intelligent. Mycroft is known for his brilliant mind, and Harry would likely inherit that. He'd be able to analyze situations quickly and come up with solutions. Also, he might be more introverted compared to the original Harry. Mycroft is not a very outgoing person, so Harry could be more reserved, spending time thinking and planning rather than being in the spotlight all the time.
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.
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.
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 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 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, it could be a really interesting story. Maybe Harry would inherit Mycroft's intelligence and use it in the wizarding world. He might solve magical mysteries in a more logical and deductive way, different from the usual magic - based solutions. For example, when dealing with the mystery of the Chamber of Secrets, instead of relying solely on spells and potions, he could use his Holmes - like reasoning to figure out who the heir of Slytherin really is.