One possibility is that Harry Potter goes to church because he's on the run from some dark magic in the wizarding world. He thinks that the church, being a place of sanctuary in Muggle society, could offer him some protection. Once there, he might start to learn about Muggle religious beliefs and find some similarities between them and the values in the wizarding world, like love, kindness, and forgiveness.
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.
In this fanfiction, Harry Potter could go to church to seek peace. After all the chaos and battles in his wizarding life, the quiet and solemn atmosphere of the church might attract him. He might sit there, thinking about his past, his lost friends, and find some solace in the religious environment. Also, he could interact with the local parishioners, who might be both curious and friendly towards this strange - looking young man with a lightning - shaped scar.
Well, Harry could be really confused at first. Ouran is a very different world from Hogwarts. He might be shocked by the opulence of Ouran Academy and the strange club system there. Maybe he'd try to find a way to fit in while still being true to his wizard self.
Maybe Harry has some strange magical illness that normal wizards can't cure. So he has to seek help from a very special doctor who might have some unique remedies.
Perhaps he would be seen as an oddity at Alfea. After all, he comes from a completely different magical system. But his reputation as the 'Boy Who Lived' might precede him. Some might be in awe of him, while others might be skeptical. His presence could also stir up some rivalries among the students at Alfea who are used to their own hierarchies. Harry would have to find his place among the fairies and deal with any potential jealousies or hostilities.
Well, he might encounter new magical creatures unique to America, like the Thunderbird. He could also visit American wizarding schools and be amazed by their different teaching methods compared to Hogwarts.
In this fanfiction, Harry could attend a Canadian wizarding school. He'd have to adapt to a different teaching style and make new friends. The curriculum might include courses on Canadian magical history and spells that are specific to the region. He might also face some challenges from local wizards who are not used to having a famous wizard like him around.
Well, in this fanfiction, Harry Potter might face new magical challenges in the ICW (International Confederation of Wizards). He could encounter different magical cultures and spells from around the world. Maybe he'll make new friends or enemies among international wizards.
Well, he might visit Beauxbatons Academy. Maybe he would meet some new friends there, like some interesting French wizards or witches. He could also explore the French wizarding culture, which is likely different from what he's used to in England.
His Gryffindor courage would still be put to the test. There could be difficult exams and challenges at college. He might also get involved in some sort of college - wide magical competition. And he would have to balance his social life, his studies, and any potential threats from the dark magic side that still exists.
He might learn new kinds of magic unique to Mahoutokoro. For example, the magic related to their magical robes that change color according to the wearer's emotions or magical ability. He could also make new friends from a different magical culture and have adventures exploring the Japanese wizarding world.
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.