Who could be the main characters in 'Harry Potter moves to Japan' fanfic apart from Harry?

One main character could be an American wizard who becomes Fem Harry Potter's best friend. This wizard could be really into exploring the different magical regions in America and takes Fem Harry Potter on adventures. They might go to the swamps of Louisiana to find a rare magical plant or to the mountains in Colorado to study a unique magical phenomenon.

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.

Obviously, Harry Potter would be one of the main characters. And then there could be characters from Twilight like Bella Swan and Edward Cullen. Hermione and Ron might also show up to visit Harry in Forks, adding more wizarding elements to the story.

Well, apart from Harry, there might be an older, experienced sailor. This character has been in the Royal Navy for years and has a wealth of stories and knowledge to share with Harry. Then there could be a group of fellow trainees who are all going through the same experiences as Harry. They support each other, but also compete in a friendly way. And there could be a mysterious figure on the ship, perhaps a stowaway or a spy from another country, which adds an element of mystery and danger to the story.

One main character could be Griphook. He already has a complex relationship with Harry Potter in the original series. In a goblin rebellion fanfiction, he could be a key figure leading the goblin revolt, using his knowledge of the wizarding world and his own skills to strategize against the wizards. Another character could be a young goblin apprentice who is caught between his loyalty to his own kind and his admiration for Harry Potter and the wizarding world.

There might also be some new or minor characters from the wizarding world that are introduced specifically for this fanfiction. For instance, an old healer who has a unique method of restoring eyesight that no one else knows about. This character could play a crucial role in Harry being able to see again.

Obviously, Harry's parents, James and Lily, would be main characters as their portraits are central to the story. Dumbledore could also be an important character. He might be the one who either hid the portraits or knew where they were all along and guides Harry to them.

There could be the Dragonborn. If Harry is in Skyrim, he might cross paths with the Dragonborn, and they could either become friends or rivals depending on the situation.

Dumbledore could play an important role too. Even though he's passed away in the original series, in fanfiction, his spirit or his past actions could be related to Harry's inheritance. He might have left some clues or instructions for Harry to find out about his true inheritance.