He could introduce new forms of magic to Middle - earth. Since the magic systems in the two worlds are different. Harry might have to adapt his magic to the more natural and earth - based magic of Middle - earth. He could also learn from the wizards or magic - users there, like Gandalf.
Well, he might use his magic in unexpected ways in Middle - earth. Maybe he'd befriend the hobbits and use his spells to protect them from orcs. For example, he could create protective shields around the Shire.
Well, he might encounter all sorts of magical creatures that are native to Tamriel. Maybe he'd get involved in the political struggles there, like the conflicts between different factions. He could also learn new forms of magic that are unique to that world.
Well, he might be really confused at first. Middle Earth has its own unique magic system and races. Harry, with his Hogwarts - trained magic, would have to adapt. He could probably make friends with some of the elves, like Legolas, as they both have a sense of honor and skill in archery. And his encounter with Gandalf would be really interesting, as they are both powerful wizards in their own ways.
Well, in such a fanfiction, the child can act as a sort of catalyst for change. They might bring new ideas or a different way of looking at things to the Middle - Earth. For example, they could influence the relationships between different factions in unexpected ways.
Well, he might start by being completely confused. In Alagaesia, the magic system is different from Hogwarts. He'd probably have to learn new spells and ways to use magic. Maybe he'd meet some interesting characters there and form new alliances. He could also introduce some of his own magical knowledge from the wizarding world of Harry Potter.
Well, he might be really confused at first. Middle Earth has its own rules, magic, and races. Percy, with his water powers, could have some interesting interactions with the rivers and seas in Middle Earth. Maybe he'd help the Fellowship in some way, like using his powers to create distractions during battles or to cross dangerous water areas.
Maybe Harry could use his magic skills to face the various challenges in Middle Earth, like fighting orcs or helping the hobbits on their journey.
One common theme is discovery. The child is constantly discovering new things about Middle - Earth, like its different landscapes, cultures, and magic.
In a Naruto fanfiction where Goku is sent to Earth, there are many possibilities. Goku's arrival could change the power balance completely. He could introduce new ways of fighting to the ninja world. For example, his Instant Transmission could be a game - changer in ninja battles. Also, his ability to constantly increase his power through training might inspire the ninja to train harder. His presence might also attract the attention of powerful enemies from other dimensions who sense his great power, leading to some epic multi - dimensional battles.
Well, perhaps Harry would be super confused at first. He'd find himself in a world full of different races like hobbits, elves, and dwarves. Maybe he'd use his magic to help in the fight against Sauron. He could teach the people of Middle - earth some new spells or ways of magic that they've never seen before.
One possible plot could be that Harry Potter somehow gets transported to Middle Earth. He might use his magic skills to help in the battles against the dark forces there. Maybe he forms an alliance with the Fellowship of the Ring and uses his knowledge of facing dark wizards like Voldemort to take on Sauron.