If Harry Potter moves to Central City in fanfiction, it could be really interesting. His magic could create all sorts of chaos or solutions. For example, he could use spells to fix the damages caused by the Flash's battles more quickly. He might also get involved in the local politics of Central City. Since he's used to dealing with the wizarding world's power struggles, he could bring a new perspective to the city's issues.
The plot might involve Harry making new friends in Domino City. He could encounter characters who are intrigued by his magical abilities. Harry might have to hide his wizard identity at first, but as the story progresses, he could start to use magic to solve problems in the city, like dealing with some dark forces that are threatening Domino City in a way that's different from the threats in the wizarding world.
Harry Potter would likely adapt to Central City by first finding a place to stay. Maybe he'd use magic to create a hidden home. Then he'd start exploring the city. He'd be curious about the technology and would try to figure out how it works compared to magic. He'd also meet new people, and gradually get used to the fast - paced life of Central City.
He could meet Yugi Moto. Yugi is a key figure in Domino City and his connection with the spirit world might be really interesting to compare with Harry's magic. Also, he might run into Joey Wheeler, who could be either fascinated or a bit skeptical about Harry's magical powers.
Harry might meet some American wizarding families that have long - standing traditions different from the pure - blood families in the UK. These families could introduce Harry to new forms of magic and social norms within the American wizarding community. He could also meet American Muggle - born wizards who have their own unique stories of discovering magic in a different cultural context compared to what he's used to.
Harry could encounter a group of wizarding surfers. They use magic to enhance their surfing experience, like creating perfect waves or making their boards fly over the water. They introduce Harry to a more laid - back side of the wizarding world in California.
Scarecrow could also be a main antagonist. His fear - inducing toxins could be a real problem for Harry. Harry would have to use his magic to counter the effects of the fear toxin and also figure out a way to stop Scarecrow from spreading it all over Gotham.
He could meet Scott McCall. Scott, being a werewolf, would be intrigued by Harry's magic. They could become friends and learn from each other. Harry could help Scott better control his werewolf side using magic, and Scott could show Harry how to survive in Beacon Hills' supernatural chaos.
He could meet French pure - blood families who have their own long - standing traditions. For instance, there might be a family that has a special connection to a particular magical forest in France. Harry might also run into French wizards who are experts in potion - making, as France is known for its fine potions in the wizarding world.