He could fit in as a unique hero. His magic could be seen as a special power like the others in DC. For instance, he could use his Patronus charm to fight off fear - inducing villains.
In a fanfiction where Harry Potter is in the DC Universe, there are countless possibilities. He could introduce magic to the DC world on a large scale. Imagine him using the Patronus charm to protect Metropolis from Doomsday. His wand could be a unique weapon in a world full of superpowers. Also, his knowledge of the wizarding world could help in solving some of the DC Universe's mysteries, like ancient spells that could counteract certain super - powered threats.
If Harry Potter goes to the DC Universe in a fanfiction, it could be really interesting. His magical skills would be a new element in the DC world. He might be confused by the different powers and technologies there. For example, his invisibility cloak would be a different kind of 'invisibility' compared to the technology - based ones in DC. He could also learn a lot from the DC heroes about courage and justice, and in turn, teach them about the magic world.
It could be really exciting. Maybe Harry Potter characters could visit Gotham City. Harry could use his magic to help Batman fight crime in a way that normal gadgets can't. For example, he could use spells to disarm villains from a distance or create magical barriers to protect civilians.
He might become more confident in using his magic publicly. In the DC Universe, with all the super - powered beings around, he'd have to step up his game. So his character could grow to be more assertive.
I think Hermione and Superman would be an interesting pair. Hermione is all about knowledge and learning, and Superman, with his alien origin and super - intelligence, could share a lot with her. They could exchange ideas about their respective worlds, and Hermione might even find a way to use magic to enhance Superman's powers or help him in some way.
He would probably be seen as a very powerful and unique being. His chakra abilities could be mistaken for some kind of meta - human power. Maybe he'd team up with the Justice League to fight against powerful threats like Darkseid. His skills in combat and his ability to use shadow clones would give the League an edge in battles.
One popular type of Lily Potter fanfiction might focus on her time at Hogwarts before she met James. It could explore her friendships, her studies, and how she dealt with the challenges of being a young witch in a magical school. For example, a story could show her in her Potions class, working hard to master difficult spells and potions, and forming a study group with her closest friends.
If Harry Potter was in the Marvel Universe, he'd probably end up at Xavier's School for Gifted Youngsters. Think about it, a school full of mutants with special powers, and here comes Harry with his wizardry. He'd either be a great asset or cause a bit of a stir. His magical abilities would be a new kind of power that the X - Men and other mutants might not be used to dealing with.
One possibility could be a story where a character from Harry Potter becomes a servant in the Fate universe. For example, Harry himself could be summoned as a servant. His magic from the Potter world might interact in interesting ways with the rules of the Fate system. He could use spells like Expelliarmus against other servants, and his ability to resist the Dark Arts might give him an edge in battles.