Harry Potter is the main one. Then, there could be some kind of guardians or leaders in the sixth world. They could be either friendly or hostile to Harry. And there might be some characters who are in a similar situation as Harry, like being a stranger in this sixth world, and they could form a bond with him.
In this 'harry potter goes to the sixth world fanfiction', we would expect Harry Potter. Besides him, there might be new wizards or witches native to the sixth world. They could have their own unique powers and personalities. Maybe there are also some half - magical beings that Harry has never encountered before. These new characters would add more complexity and freshness to the story.
Obviously, Harry Potter himself. And there could be characters like Hermione and Ron who might either go with him or be involved in some way from afar. There may also be original characters created for Alfe, such as an Alfe wizard who becomes Harry's guide.
Obviously, Harry Potter himself. Then there could be Hermione and Ron, who might visit him at Harvard or communicate with him via magic. There could also be new characters like his Harvard roommate, who could be a normal Muggle but start to suspect that Harry is not an ordinary guy. And maybe some professors at Harvard who take an interest in Harry's different way of thinking.
He could meet an Egyptian wizard who is an expert in ancient magic. This wizard could teach Harry a great deal about the history of magic in Egypt.
In the 'harry potter goes to the sixth world fanfiction', it's possible that Harry Potter will meet new friends or foes. He could face different kinds of challenges related to the new world's magic system. For example, the rules of magic in the sixth world might be very different from what he's used to in Hogwarts. He might have to figure out how to use his existing skills in new ways to survive and thrive in this strange new place.
Hermione would be a likely companion. She loves learning and exploring, so she'd be eager to go on a traveling adventure with Harry. Ron might also tag along, especially if there's a chance of food and adventure. Neville could be another option. He has grown a lot in courage and his knowledge of plants could come in handy in different magical environments. Luna Lovegood would be a very interesting companion too. Her unique perspective on magic and the world would add a lot of fun and mystery to the journey.
Obviously, Harry Potter himself. There could also be some Beautox - natives, like a wizard or witch who is an expert in Beautox magic. Maybe Hermione would somehow find a way to follow Harry and she'd be there too, trying to figure out the new magic system.
Obviously, Harry would be one of the main characters. There could also be local Harlem residents like a street - smart kid who shows Harry around. A jazz singer could be another character, perhaps someone with a mysterious past that Harry gets involved with.
Potential new characters might include a young American wizard called Tommy. He's a bit of a troublemaker but has a good heart. There could also be an old and wise American wizard professor, Professor Anderson, who teaches Harry about the history of American magic. And then there's a female wizard, Sophia, who is very interested in the British magic system and befriends Harry to learn more.
Sakura, of course. There could also be a wise old wizard who helps her understand the new world she's in.
Obviously, Buffy would be a major character he'd interact with. They could start off as wary of each other but then grow to respect one another's fighting skills. Giles too, as he has a wealth of knowledge about the supernatural, and he and Harry could have some interesting discussions about different types of magic.