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 an assassin from a far - off land who comes to Hogwarts under false pretenses. They have their own set of skills and motives that are different from the regular characters in the Harry Potter series.
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 Muggle - born wizard could be the main character. They are used to the Muggle concept of hairdressing but also want to incorporate their new - found magic into it. This character would be constantly trying to bridge the gap between the two worlds in their salon, creating a unique blend of Muggle and wizarding hairdressing styles.
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.
Perhaps Accelerator from the railgun universe could be the main character. He has his own set of abilities that would be very interesting to transplant into the Harry Potter world. He might initially be seen as a threat due to his powers but then end up using them to fight against a common enemy, like a new dark wizard or a powerful magical creature that has gone rogue.
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'.
Neville could also be a main character. He's often underestimated, but if he found the Harry Potter headphones, it could be his chance to shine. He could use the power of the headphones, whatever it may be, to stand up to bullies or to help protect Hogwarts. Maybe the headphones give him the confidence he needs to become a hero in his own right.