Well, it's possible that Dumbledore could be involved in some way. Maybe he sends Harry to the Beltane celebration for a special purpose. Hagrid could also be there, enjoying the bonfires and sharing stories about magical creatures related to Beltane. And don't forget about the house - elves. They might be in charge of preparing the Beltane feasts and decorations.
There could be other Hogwarts students. For example, Neville could be there, exploring the different plants and herbs that are associated with Beltane. Luna Lovegood might also make an appearance, with her unique perspective on the magical aspects of the festival. And perhaps some local wizards and witches from the area where the Beltane celebration is taking place.
Maybe it could be about Harry experiencing the Beltane festival. He might encounter magical creatures specific to Beltane, like enchanted fire sprites. He could also participate in the traditional Beltane celebrations such as the maypole dance and bonfire lighting, and along the way, he might learn about the significance of Beltane in the wizarding world.
Draco Malfoy is a very common character. Since they are in the same house in this fanfiction concept, their interactions would be different from the original story. There would likely be more opportunities for them to either become friends or rivals in a new way.
There could be some original characters created by the fanfiction authors. These could be Harry's new classmates or friends at Durmstrang. They might have their own unique magical skills and personalities, and through their interactions with Harry, they can help develop the story further. For example, a new friend could introduce Harry to a secret part of the Durmstrang grounds or a special magical technique that's unique to the school.
Hermione could be there. She's always around to support Harry and might be observing the ability test.
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.
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.
Well, Dumbledore would most likely be a significant character. He might be one of the few people who quickly understand the implications of Harry being a mutant. He could help Harry navigate through the challenges that come with his new identity. Additionally, there could be some mutant characters from the mutant universe who cross over into the Harry Potter world. For example, a character like Professor X could be an interesting addition, guiding Harry in understanding and using his mutant powers in a responsible way.
Maybe there's a human friend who is really curious about Harry's new situation. This friend could be constantly asking questions and trying to get involved in Harry's alien - related adventures, adding some comedic relief to the story.
Another character could be a fellow inmate who has been in jail for a long time. He befriends Harry and teaches him the ropes of surviving in jail.
It could be Hermione. Since she's Harry's close friend, she would likely play a significant role in a story where Harry is immortal. She might be the one trying to help Harry adjust to his new state or be involved in his adventures in some way.