Perhaps a strict but fair French teacher, Madame Dubois. She could be important as she guides Harry through the differences in the French magical education system. And then there could be a mischievous French student named Luc, who often gets Harry into small adventures around the school.
There could be a French wizard named Pierre who becomes Harry's friend and helps him adjust to the new school.
There could be a strict drill sergeant named Sergeant Thompson. He is tough on Harry at first but later comes to respect him. Another character could be Harry's roommate, Jack. Jack is a typical military school student who helps Harry understand the ropes.
Maybe Harry could struggle with the language at first. He might make new friends who introduce him to French wizarding traditions. And he could have adventures in the unique French school setting.
Besides Harry, Ginny could be a main character. She might be interested in the sports aspect of the Egyptian school, like their version of Quidditch. And there could be a local Egyptian student who becomes friends with Harry. This student could have a deep connection to the history of Egypt and help Harry understand the significance of certain magical sites in the country. They could explore ancient temples together and face various challenges along the way.
Ron could also be important. He might be torn between his loyalty to Hogwarts and his friendship with Harry. Eventually, he could choose to leave Hogwarts to be with Harry, bringing his Weasley family charm and his own brand of magic to the group. The Weasley twins might also get involved, providing some much - needed humor and their unique magical inventions.
There could be a group of Japanese students who are initially skeptical of Harry but later become his allies. For example, a shy girl who is really good at Japanese magic but lacks confidence. And a tough - looking boy who is actually very kind-hearted and they all form a sort of magical study group together with Harry. There might also be a mischievous Japanese magical creature that befriends Harry and causes some chaos in the school.
There may be a group of students who are outcasts or have special powers that are not fully understood. Harry might befriend them, and they could all be main characters in the sense that they are central to the story's plot. They could be working together to uncover secrets about the school, themselves, or the magical world in general.
Hermione would definitely be one of the main characters. She would be very curious about Death's presence at school. She might try to research about it in the library, and her inquisitive nature would lead to some interesting interactions with Death. For example, she could ask Death about the secrets of the afterlife or some ancient spells related to death magic.
Viktor Krum could be a major character. Since he is from Durmstrang, he might play a role like a mentor or a rival to Harry. Another character could be the headmaster of Durmstrang. He would be important as he sets the rules and tone for the school.
Madame Maxime, the headmistress of Beauxbatons, could play an important role. She could be a mentor to Harry, guiding him in his new magical studies at Beauxbatons. She might also be involved in some sort of conflict or mystery that Harry has to help her solve, which could involve the relationship between Beauxbatons and other wizarding schools or some ancient magic within the school.
There could be a really strict but fair headmaster who has a unique way of teaching magic. He might be an old wizard with a lot of secrets.