It could start with Harry being found as a baby in Rome. Maybe a Roman wizard family takes him in. They notice his special powers right away and start to train him in their ways.
The start could be that a prophecy in the SPQR magical community predicts the arrival of a powerful wizard from another land. When Harry shows up, the Roman wizards are both curious and cautious. A powerful Roman wizard takes it upon himself to raise Harry, seeing the potential in him. This wizard then starts to introduce Harry to the ways of the SPQR magic and society, setting the stage for his new life and adventures.
Perhaps the story begins with a magical event in SPQR that somehow brings Harry to this Roman - magical world. For example, a portal could open between the British wizarding world and SPQR, and Harry, as a young child, accidentally steps through it. Then he's found by a kind - hearted Roman magic user who decides to raise him.
Well, in 'Harry Potter raised in SPQR' fanfiction, we can imagine a whole new world for Harry. SPQR represents the Roman Republic and Empire. Harry could be part of a Roman magical family. He'd likely attend a Roman - style magic school. His enemies might be different too, perhaps related to Roman dark magic or political rivals. His adventures would be filled with exploring ancient Roman ruins for magical artifacts.
Perhaps the start of the fanfic could be that Voldemort's final curse on Harry backfires in a strange way due to some ancient magic. Instead of just leaving a scar, it sends Harry through a portal to Panem. He lands in the Capitol, where he's immediately seen as an oddity. But before the Capitol can fully study him, he manages to escape and finds himself in a district. There, he begins his journey of growing up in Panem, with his wizarding skills gradually emerging as he faces the hardships of this new world.
It could start with Harry being found by a Hetalia - inspired character or family. Maybe he's discovered in an alley in a world where Hetalia and Harry Potter elements co - exist, and this new family decides to raise him.
The story would be unrecognizable. His character would be different, and so would his relationships.
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.
The story could start with Yugi finding Harry as a baby. He would then raise Harry in his own world, teaching him about the power of friendship and loyalty like he learned from his friends in Yu - Gi - Oh. As Harry grows up, he starts to show signs of magic. Yugi might be confused at first but then would support Harry in exploring his magical abilities. Eventually, Harry would have to face the threat of Voldemort, but with the unique skills and values Yugi instilled in him.
It could start with Harry being found by the Punisher instead of the Dursleys. The Punisher would train him in combat and survival skills. As Harry grows up, he discovers his magical abilities. He might then use his newfound magic in combination with his combat skills to fight crime in both the muggle and wizarding worlds.
Well, if Harry Potter was raised by Zeref, it would be a very different story. Zeref is a rather dark and complex character from Fairy Tail. Harry might grow up with a different view of magic. He could be more inclined towards darker forms of magic or have a more cynical view of the wizarding world. Maybe he would be more isolated as Zeref's influence might not be well - received in the Hogwarts environment.
In the beginning, Batman would instill in Harry a sense of vigilance and a desire to protect the innocent. As Harry enters the wizarding world, he'd be an outlier. He might face some resistance from the more traditional wizards. But he'd also introduce new ideas. For example, he could suggest a more organized approach to fighting the dark forces, similar to Batman's methods. His relationships with the teachers would also be unique. Some might admire his different perspective, while others might be skeptical. As the story unfolds, Harry would likely be at the center of a clash between the old ways of the wizarding world and his new - age ideas influenced by Batman.
The story could be amazing. Since Narnia has a different magic system than the wizarding world in Harry Potter. Harry might have to adapt quickly. He could make friends with the talking animals in Narnia. His upbringing there would probably give him a different perspective on magic and power. For example, the power of Aslan is more like a divine power compared to the magic in the wizarding world. This could lead to some interesting conflicts or collaborations when he discovers his own wizarding heritage later.