One possibility is that Harry is sent to Japan on a secret mission. He has to blend in with the local magical community in Japan. He could be staying with a Japanese wizard family, going to their local magical school for a while, and getting involved in some sort of mystery that only he can solve because of his unique experiences from his own school back home.
Well, it could be about Harry going to Japan for a magical exchange program. Maybe he meets new wizards there, discovers unique Japanese magical creatures, and learns different types of magic that are specific to Japan.
One possible plot could be that Harry discovers a hidden magical school in Japan. He has to adapt to the new culture and magic system there. Maybe he meets new friends who teach him about Japanese magical traditions and spells.
Maybe Harry meets a group of magical creatures' protectors in Japan. They are dedicated to protecting the unique magical creatures in Japan, and Harry joins them in their adventures, learning a great deal about Japanese magical fauna along the way.
A new character could be an old and wise sensei - like wizard, Master Takeshi. He teaches Harry about the ancient Japanese magic arts. And there might be a group of mischievous students, like Hiro, Yuki, and Ryu, who at first give Harry a hard time but later become his friends.
Yes, there are quite a few. You can start by looking on popular fanfiction websites like Fanfiction.net or Archive of Our Own. Some stories might explore how Harry's experience at Durmstrang would be different from Hogwarts, like different classes and a more strict regime.
In fanfiction, if Harry attends Beauxbatons, he might experience a very different magical education. The curriculum at Beauxbatons could be more focused on certain aspects like etiquette and different forms of magic compared to Hogwarts. He could make new friends from different backgrounds and learn different magical traditions. Maybe he'd have to adapt to the more refined and formal environment of Beauxbatons.
Perhaps Harry is on a sort of exchange program. He has to adapt to the Japanese wizarding school system. He makes new friends who introduce him to Japanese culture. They go on adventures together in Japan's beautiful and sometimes spooky landscapes, like exploring an old haunted shrine that has a magical secret within. Harry's presence also brings a new perspective to the Japanese wizards and witches about the outside magical world.
In a 'naruto attends beauxbatons' fanfiction, Naruto could arrive at Beauxbatons by accident, perhaps through a strange magical - ninja portal mishap. Once there, he'd stand out with his orange jumpsuit and headband. He might get involved in a mystery within the school, like a series of disappearances. His ninja senses and skills would come in handy in investigating. He could also have a romantic sub - plot with one of the Beauxbatons girls, who is intrigued by his brash and brave nature.
One common theme is the culture shock. Harry coming from Hogwarts to Durmstrang would experience a very different magical education system. Another theme could be the relationships he forms with new classmates. They might be more competitive or have different loyalties.
The plot could develop with Harry being abandoned in a big Japanese city like Tokyo. He might end up in the muggle part of the city at first and have to use his wits to get by. Eventually, he attracts the attention of Japanese wizards who are both curious and cautious about him. They take him to their magical enclaves where he discovers that there are different types of magic in Japan. There could be political intrigue within the Japanese wizarding community regarding Harry, with some seeing him as a threat and others as an opportunity. He has to navigate through all this while also dealing with his own feelings of abandonment.
The story changes in many ways. Firstly, the setting is different. Beauxbatons has a more European charm compared to Hogwarts. Harry would be exposed to different kinds of magic and spells. His relationships with other students would be different too. He might not have the same rivalries as he had at Hogwarts. Instead, he could form new alliances based on the different values at Beauxbatons.