In a 'Harry Potter raised by Merlin' fanfiction, the plot could be really interesting. Merlin, being an extremely powerful and knowledgeable wizard, would raise Harry in a secluded place perhaps. He would teach Harry not only spells but also the ethics and history of magic in a very detailed manner. Harry would grow up with a different set of values compared to the ones he would have if raised by the Dursleys. His view on dark magic might be more nuanced as Merlin has seen the rise and fall of many dark wizards. Also, his relationship with other magical creatures would be different. For instance, he might befriend centaurs or merpeople in a more profound way because Merlin could introduce him to them in a respectful and understanding way. This would make his adventures at Hogwarts and beyond quite different from the original story.
Well, for one thing, Harry would probably be more in touch with the old magic. Merlin has a deep connection to the roots of magic. So Harry might learn spells and techniques that have been long forgotten. His relationship with Hogwarts could also be different. Maybe he would see the school as a place to further expand on what Merlin has already taught him, rather than a place to discover magic for the first time.
Well, one possibility is that Harry would become an even more powerful wizard. Merlin could teach him ancient spells and magic that are long forgotten in the wizarding world of Harry's time. Harry might gain a deeper understanding of magic's origin and be able to use magic in ways that are more instinctive and powerful. He could also learn about different magical cultures from Merlin's vast experience.
He would probably learn basic but very powerful defensive magic first. Merlin would know the importance of protecting oneself, so things like a strong Shield Charm or basic protective enchantments would be among the first things Harry learns.
In such a fanfiction, perhaps Wolverine's rough and protective nature would greatly influence Harry. Harry might grow up with a fierce sense of self - defense and loyalty. He could be trained in combat skills from a young age, making him a very different kind of wizard. Maybe he'd use his magic in more physical and aggressive ways compared to the traditional Hogwarts students.
In a 'Harry Potter raised in Ireland' fanfic, perhaps he'd grow up with a strong connection to Irish magic. He might learn unique spells only known in Ireland. Maybe he'd attend a local Irish wizarding school first before Hogwarts, and make friends with Irish magical creatures.
In a 'Harry Potter raised as a Warrior' fanfiction, the story could start with Harry being found by a group of Warriors. They teach him their code of honor and how to fight. As he grows up, he becomes an expert in their ways. When he enters Hogwarts, he stands out because of his unique combat - like approach to things. He might even form his own group of friends who are interested in his Warrior - style, and together they could face the challenges of the wizarding world in a different way compared to the original story. For example, instead of relying solely on spells, he might use his physical combat skills during duels.
In this fanfiction, the ghosts might protect Harry in a way that living people can't. They could give him advice based on their long years of observing Hogwarts. For example, they might tell him secrets about the founders of Hogwarts that help him in his adventures. Also, Harry's personality could be influenced by the ghosts' ethereal and somewhat detached nature, making him more introspective.
The plot could involve Harry growing up in a world where the boundaries between Greek and wizarding magic are blurred. Hecate could introduce him to magical creatures from Greek mythology. He might also have to face different kinds of dark forces that are more related to the ancient evils that Hecate has been fighting for centuries. This would make Harry a very different kind of wizard, one with a more diverse magical knowledge and power base.
One possible plot could be that Harry Potter grows up in Mordor. Sauron might train Harry in dark magic, but Harry could have an internal struggle as he has an inherent sense of good from his parents. He might try to find a way to use the power he's learning for good, against Sauron's wishes.
Well, it could be really interesting. Maybe Sasuke would teach Harry some ninja skills. Harry might grow up with a different kind of magic, a blend of wizardry and ninjutsu. He could use his wand in a more combat - like way inspired by Sasuke's fighting style.