Well, the magic system might be integrated with Japanese folklore. For example, instead of wands, they might use something like Japanese talismans. And Hogwarts could be a Japanese - style castle or temple - like structure, with different houses representing different Japanese clans perhaps.
One interesting 'Harry Potter in Japan' fanfiction could be one where Harry visits a Japanese wizarding school. It might explore how the Japanese magical culture, with its unique traditions and spells, interacts with the more Western - style magic he's used to. For example, there could be a story about him learning Japanese wand - making techniques which are different from what he learned at Hogwarts.
Another difference is in the social structure. Japanese society has its own values and hierarchies, which can be reflected in the fanfiction. So, relationships between characters might be different. In a Japanese - inspired Hogwarts, for example, there could be more respect for elders and a different way of handling conflicts among students, which would be interesting to explore in the fanfiction.
Maybe Harry would attend a Japanese wizarding school. He could learn Japanese magic, make new friends who are into things like sumo - but with a magical twist, and explore Japanese magical creatures. He might also have to adapt to Japanese wizarding traditions which could be very different from those in the UK.
Well, perhaps Harry could attend a Japanese wizarding school that has its own unique traditions. He might learn Japanese magic spells and make new friends among Japanese wizards and witches. He could also explore the Japanese magical world which may have different magical creatures compared to the UK.
In such a fanfiction, Harry would grow up in a completely different cultural setting. He might have different friends, perhaps those from traditional Japanese wizarding families. His upbringing could be influenced by Japanese values like respect for elders and harmony with nature. His clothing style might also be a blend of the wizarding robes and traditional Japanese garments. He could also face unique challenges like dealing with Japanese magical creatures that are different from those in the UK.
A really cool fanfiction idea could be that the Deathly Hallows have some connection to ancient Japanese magic. So, Harry and his friends have to travel to Japan to uncover the secrets related to the Hallows and how they interact with Japanese magic.
You can try some popular fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms, including Harry Potter, and might have some Japan - related ones.
One interesting fanfiction could be where Harry Potter is abandoned in a small Japanese village. He might discover the local magical traditions that are different from the British ones. Maybe he meets a kind Japanese wizard family who takes him in and he has to adapt to their way of life, like learning about Japanese magical creatures and spells.
These fanfictions usually delve into the cultural clashes and adjustments Fem Harry Potter has to make. They might incorporate elements of Japanese folklore and magic, adding an exciting twist to the familiar Harry Potter world.