Maybe Harry would be a bit confused at first. The world of Merlin fanfiction could have different rules and settings compared to his own magical world. However, as he reads on, he might start to enjoy the new and different take on magic. He could also get some ideas for his own adventures, or think about how the characters in the fanfiction would fare in the wizarding world he knows.
It's possible that Harry Potter would be completely absorbed in the Merlin fanfiction. He has a curious nature, and seeing how another magical world is depicted in the fanfiction would satisfy his thirst for knowledge about magic. He might even start to wonder if there could be some connection between his world and the world of Merlin that the fanfiction is creating, like if there are similar spells or magical creatures in both universes.
In a fanfiction where Harry Potter is mentored by Merlin, there would be a fascinating blend of different magical eras. Harry would be exposed to Merlin's way of thinking, which was shaped by a much earlier and perhaps more primitive (but in some ways more powerful) form of magic. Merlin could teach Harry how to harness magic from nature in ways that Hogwarts doesn't usually teach. This could include using the elements in more direct ways for spells and defenses. Harry might also develop a new sense of magical ethics, influenced by Merlin's different cultural and historical context.
He might be really intrigued. Merlin's world has its own magic system and characters. Harry could find similarities and differences between the two magical universes in the fanfiction. Maybe he'd get some new ideas about magic from it.
Because both are related to magic. Harry Potter is all about magic in Hogwarts and the wizarding world, and Merlin is a famous magical figure. So, the fanfiction about Merlin might offer a new perspective on magic that Harry would find fascinating.
Because he loves magic. Merlin's world is full of magic too, so he might be curious to see how other magical stories are told.
Well, Harry could become an even more powerful wizard. Merlin is known for his great magic skills. He might teach Harry some ancient spells that are long forgotten in the wizarding world of Harry's time. This could give Harry an edge against Voldemort or any other dark forces.
He might also be a bit confused at times. Some fanfictions deviate a lot from the real events in his life. For example, if there's a fanfiction where he has a completely different upbringing, it would be strange for him to read about. He could also feel a sense of flattery that so many people are interested in his story and want to create their own versions of it.
In some fanfictions, if Harry finds Merlin's wand, it could potentially give him an extraordinary boost in magic power. Maybe he'd be able to perform spells that are far beyond his normal capabilities. For example, he might be able to control time or space like Merlin was rumored to do.
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.
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.
Merlin might start by teaching Harry the basics of magic from a different perspective. Maybe he would show Harry how to draw magic from the very essence of nature. For example, instead of using a wand in the traditional way, he could teach Harry to use his hands and the energy around him.