A descendant of one of the original founders of Hogwarts. They might have some special connection or mission related to the school and the wider wizarding world. They would travel around to uncover secrets about their family's past and the history of the magical places.
A young girl who has always dreamed of the Harry Potter world could be the main character. She could be transferred there and discover she has some latent magical abilities that are unique even in the wizarding world.
It could be an original character. Maybe a young wizard who discovers a long - lost time - travel spell. This character could be from a family that has been affected by the dark arts in the past and travels back to change their family's fate. They would then get caught up in the larger events of the wizarding world during that time.
Well, the main character could be a Muggle - born wizard who has always felt a bit out of place in the wizarding world. Traveling through the Harry Potter world would be their way of really understanding and finding their place in it. Or it could be a time - traveling character, perhaps a future wizard who comes back to the time of Harry Potter to study the magic of that era. They could get involved in various adventures during their travels. Also, a group of international exchange students could be the main characters. They would travel around the wizarding world, comparing and contrasting their different magical cultures.
It could be a new character, like a young Auror who has been assigned as an inspector. He would be fresh out of training and eager to prove himself at Hogwarts. He might be a bit naive at first but quickly learns the ropes and uncovers some interesting things about the school.
It could be a young witch who is just starting to explore her magical abilities outside of Hogwarts. She takes on a babysitting job to earn some extra money and ends up having all sorts of magical adventures with the kids she babysits.
A new character could be the main character. For instance, a Saiyan who has been transported to the Harry Potter universe. This character would have to navigate the strange new world of magic while also dealing with their own Saiyan instincts and powers.
It might also be a descendant of one of the well - known characters from the Harry Potter series. For example, a grandchild of Sirius Black who inherits his rebellious spirit and uses it to fight against the new dark forces as the 'darkslayer'.
A new student at Hogwarts could be the main character. They might be a bit of an outcast and find solace in the graveyard. There, they stumble upon a mystery that no one else has noticed before, and it becomes their mission to solve it. This would be a great way to introduce a fresh perspective to the Harry Potter fanfic world.
It could be a long - lost relative of Harry Potter. Maybe a cousin who was hidden away for some reason and now discovers their magical heritage. They could have a different personality from Harry, like being more shy and studious but still having a great sense of justice.
Obviously, Harry Potter himself could be the main character. Given his adventurous nature, he would be a great fit to incorporate parkour into his already impressive list of skills. He could use parkour to explore new areas of Hogwarts or to escape from dangerous situations.