How might the plot develop in a 'Harry Potter' fanfic where Harry Potter hides that he is a dark fanfic?

He might hide it because he doesn't fully understand his own fascination. Harry has always been on the side of good, but perhaps there are elements of the dark side that seem alluring in a strange way. He could be afraid that exploring these feelings would lead him down a dangerous path, so he keeps it a secret.

In the 'Harry Potter Hides He Is Dark' fanfic, Harry could be hiding his dark side by carefully choosing his words. He wouldn't let slip any thoughts or opinions that might hint at his darker tendencies. He might also avoid certain places or people that could trigger his dark side, like staying away from dark magic artifacts or those who practice dark magic openly. And, of course, he could be using Occlumency not just to keep his thoughts private from Voldemort but also to hide his own dark nature from others.

The revelation of Harry being 'dark' would cause chaos in the wizarding world. People who once idolized him would feel betrayed. The Order of the Phoenix might question their support for him. Enemies could use this as an opportunity to turn the public against Harry. His relationship with Ginny would also be severely strained. She fell in love with the 'good' Harry, and this new side of him could be too much for her to handle. Also, it could potentially put Neville or Luna in danger if they continued to support Harry, as they might be seen as associated with his 'darkness'.

Well, it could be that Harry Potter discovers he has a connection to Sparda. Maybe he has some latent power that is related to Sparda's abilities. He then has to learn to control this new power while still dealing with the threats in his own wizarding world. And perhaps he uses his new - found powers to fight off dark wizards in a more badass way.

The plot would take a very dark turn. Harry would no longer be the hero we know. He might start working against the Order of the Phoenix. His actions would be unpredictable and often evil - like attacking Hogwarts instead of protecting it.

Maybe in this fanfic, Harry discovers a prophecy that is related to her gender. To avoid fulfilling a part of it that could lead to disaster, she hides her gender. In the process, she could form new alliances with female students who are more in tune with her new 'female identity'. She might also face challenges in classes like Defense Against the Dark Arts because the teaching methods are sometimes more tailored to male students in the original Hogwarts setup.

The plot could start with Harry being sorted into Ravenclaw, which surprises everyone. Then he begins to discover the unique aspects of Ravenclaw house. He might get involved in a mystery related to a lost Ravenclaw heirloom. As he tries to solve it, he meets other Ravenclaw students with different areas of expertise, and together they use their collective intelligence to follow the clues.

He may be confused at first. Fanfics can be very different from his real experiences. He might wonder why people write such things about him and his world.

One possible plot could be that a new, extremely powerful and irresistible poison is created by a dark wizard. The main characters, like Harry, Hermione, and Ron, have to find an antidote before it spreads and kills many students at Hogwarts.

Perhaps it's a fanfic that takes the concept of Persephone's abduction in Greek mythology and applies it to the Harry Potter universe. The 'his' could be a dark wizard who kidnaps Persephone, a powerful witch, and the plot could be about her friends in Hogwarts trying to rescue her. Or it could be a more romantic take, where 'his' is a hero - type character and Persephone is in some sort of danger related to the ongoing battle between good and evil in the wizarding world, and he has to save her.