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.
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.
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.
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.
Yes, there are likely fanfictions out there with this concept. Fanfiction writers often come up with creative and unexpected crossovers. However, the 'Harry Potter' and 'Mycroft' universes are quite different in nature, which makes this kind of fanfiction all the more interesting as it combines the magical world of 'Harry Potter' with the more mystery - filled and intellectual world often associated with Mycroft.
Mycroft is significant as he represents a different type of detective intelligence. He doesn't run around on the streets solving crimes like Sherlock. Instead, he uses his intelligence to manage and manipulate information on a grander scale. His existence in the novel shows that there are different ways to use one's intellect to deal with the problems of society.
Many Mycroft Holmes fanfictions revolve around his role in the Holmes family dynamic. Some stories might show how he interacts with his parents and how that has influenced his relationship with Sherlock. There could also be fanfictions that give Mycroft a love interest, which then changes the way he approaches his work and family.
Mycroft Holmes is an interesting character in the novels. He is highly intelligent, perhaps even more so than his more famous brother Sherlock in some aspects. He has a great influence in the background, often involved in matters of high importance to the government. His deductive abilities are sharp, but he uses them in a different way compared to Sherlock, mainly for political and administrative purposes.