Who could be the main characters in a 'Harry Potter Dark Side Dance' fanfiction?

The plot could involve a new dark wizard who arrives at Hogwarts under the guise of a dance instructor. He teaches a dance that is actually a means of opening a portal to the dark side. The students who participate unknowingly start to have their minds filled with dark thoughts. Harry, with his natural resistance to the dark side, notices the change in his classmates and tries to stop the dance instructor before it's too late. He teams up with Hermione and Ron to figure out the true nature of this 'dark side dance' and close the portal.

It could be Dumbledore. In a twisted take on the story, if Harry joins the dark side, Dumbledore would be the one trying to stop him. Dumbledore has always been the guiding force for the good side, and Harry's defection would be a huge blow. Dumbledore would then have to face the difficult decision of either trying to save Harry or stopping him by any means necessary, making him the antagonist from Harry's new 'dark' perspective.

Dumbledore could be a significant presence, even if he's no longer alive in the original timeline. His wisdom and knowledge could be passed on in some magical way, like through a magical diary or a portrait that has special powers. And then there could be some characters from the dark side who are trying to redeem themselves, such as a former Death Eater who sees the error of their ways and joins Harry's new movement in the fanfiction.

It's hard to say for sure without reading the fanfiction, but it could be Harry Potter himself. He might be at the center of the story, trying to figure out what's going on with this 'Dance of Dragons' in his world. Hermione could also be a main character, using her intelligence to research and understand the phenomenon. And perhaps some of the dragon keepers or those with a special connection to dragons in the Harry Potter world could be main characters too.

Dumbledore could be seen as the main antagonist from Harry's new perspective on the dark side. Dumbledore represents all that is good in the wizarding world, and if Harry has turned to the dark, Dumbledore would be the one trying to stop him, to bring him back to the light. So in this context, Dumbledore becomes the opposition that Harry has to face.

In this fanfiction, the main characters could be quite diverse. Since it's about a 'dark heir', there would likely be a character who embodies this role. It could be a previously unheard - of character with a complex backstory related to a dark legacy. Harry Potter might be involved to oppose this dark heir or to try and understand their motives. His friends, like Hermione and Ron, could also be part of the story. Additionally, there could be other magical beings or characters from the 'Harry Potter' lore, such as members of the Order of the Phoenix or Death Eaters, who are drawn into the plot due to the emergence of the dark heir.

Obviously, the Dark One is a main character. Harry Potter himself also often plays a crucial role as he is usually the one who has to face the Dark One in some way.

Well, Harry Potter is most likely one of the main characters as it's a Harry Potter fanfiction. He would probably be at the center of the new revelations and story developments.

It's possible that the main character is the 'dark child' of course. There could also be a mentor - like figure, maybe an older wizard who tries to guide the child towards the light. And it wouldn't be surprising if there were some antagonists as well, such as other dark wizards who want to use the child's power for their own evil purposes.

There could also be an original character created specifically for this fanfiction who becomes the Dark Phoenix. This character would then be a central focus, with their transformation and the resulting events driving the story forward. Their backstory, motives, and relationships with other characters would be important aspects of the narrative.