He could make new friends who have different magical abilities and backgrounds. Since Ilvermorny is in America, the magic there might have some cultural differences. For example, the spells and the way magic is taught could be distinct. Harry would need to adapt to these changes. Maybe he would learn new spells that are unique to American magic, which could help him in future adventures.
In some fanfictions, Harry might find it difficult to adjust to the new magical environment at Ilvermorny. The different houses, like Horned Serpent, Wampus, Thunderbird, and Pukwudgie, would be a new concept for him compared to Hogwarts' houses.
He could meet new professors. These professors would have their own teaching styles and areas of expertise. They might introduce Harry to different aspects of American magic that he has never encountered before.
In such a fanfiction, Harry might go to Voldemort to try and reason with him. Maybe he believes there's a chance to end the war without more bloodshed. He could offer Voldemort a way out, like exile instead of death.
In this fanfiction, Harry might go to Diagon Alley to buy new school supplies. He could visit Ollivander's to get a new wand or Flourish and Blotts for some interesting magic books.
Well, he might encounter new magical creatures unique to PT. Maybe he'll learn some different spells or forms of magic there.
He might use magic to enhance his workouts. For example, he could use a spell to make the weights lighter when he's starting out and gradually make them heavier as he gets stronger. It would be really cool to see him combine his wizarding skills with gym exercises.
In fanfiction, if Harry Potter goes to Spain, he may discover new magical artifacts. Spain has a rich history, and there could be artifacts related to the Moors or other historical periods that hold great magical power. He might also have to adapt to the Spanish wizarding culture, which could include different festivals, traditions, and social norms within the wizarding community.
Perhaps he would find that the wizarding world has finally united with the Muggle world in harmony. Technology in the Muggle world could have influenced magic in strange and wonderful ways. He could be shocked to see flying cars that are now common, or houses that are built with a combination of magic and advanced Muggle construction techniques.
Well, he might be quite confused at first. Churches are not really a part of the wizarding world he's used to. Maybe he'd be looking around in wonder at all the religious symbols and the way people pray.
Well, if Harry Potter goes to France in fanfiction, perhaps he would visit the Beauxbatons Academy. He could learn about their different styles of magic education. There, he might make new friends and enemies. Maybe he'd get involved in some sort of international magical competition that involves both Hogwarts and Beauxbatons. And who knows, he could even discover some long - lost French magic spells that could help him in his future battles against the Dark Arts.
In a fanfiction scenario where Harry Potter goes to Pandora, he'd probably face a culture shock. The Na'vi's connection to nature is so different from what he's used to in the wizarding world. He could end up using his skills in potions to try and understand the biology of Pandora. He might also be in awe of the banshees and try to fly one using magic, which could lead to all sorts of adventures.