The plot could be developed by showing Harry's initial doubts and struggles. Maybe he's offered power and knowledge by the dark side that he can't resist at first. For example, being promised the ability to bring back his dead parents. Then, as he gets deeper into the dark side, he starts to realize the true cost of his actions.
One way to develop the plot of 'Harry Sold to the Dark Side' fanfiction is to focus on the external factors that push Harry towards the dark side. It could be political unrest in the wizarding world, with the dark side presenting itself as a solution. Then, as Harry becomes part of the dark side, his identity starts to change. He might be given a new name or a new set of powers. The story could then build on how he tries to reconcile his old self with his new dark identity. There could be a moment of self - reflection where he realizes he's gone too far and tries to find a way back, or he could fully embrace the dark side and become a major antagonist, changing the entire dynamic of the wizarding world as we know it.
One interesting 'Harry Sold to the Dark Side' fanfiction could be one where Harry is tricked into joining the dark side. Maybe Voldemort manipulates his sense of loneliness after the death of Sirius. Another could involve a magical artifact that compels Harry to side with the dark forces against his will. And there might be a fanfic where the wizarding world turns against Harry, pushing him towards the dark side out of desperation.
Well, perhaps Harry gets tired of being constantly in danger and feeling unappreciated in the wizarding world. He might be lured by the Dark Side with promises of power and safety. Voldemort could offer him a place by his side, showing him a different view of magic that seems more appealing in a warped way.
In some fanfiction, the dark side might help Harry by giving him unique powers. For example, dark magic could offer him abilities that are not available in regular magic, which he can then use to fight against stronger enemies.
In a 'Harry Potter turns to the Dark Side' fanfiction, the plot might involve Harry being influenced by a powerful dark object. For example, a cursed artifact that makes him see the Dark Arts in a different light. He could start to believe that the ends justify the means and that the Dark Side has been misrepresented all along. As he delves deeper into the dark side, he begins to turn against his old friends, thinking they are too naive and weak to truly change the wizarding world.
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.
Well, one possibility could be that Harry, feeling betrayed by the Order of Phoenix or perhaps influenced by some dark magic artifact, starts to question the motives of the good side. He might see how the Dark side offers power and a different kind of 'freedom'. For example, Voldemort could manipulate Harry by showing him how the wizarding world could be united under his rule, eliminating the in - fighting among pure - bloods, half - bloods and Muggle - borns, though of course this would be a false promise.
Well, it could be that the dark side has certain powers or artifacts that end up being the key to saving Harry in fanfiction. Maybe a dark wizard has a magical object that, when used in the right way, can reverse a curse on Harry or help him defeat Voldemort. The dark side's resources, which are often feared and shunned in the normal Harry Potter lore, can be turned into something positive for Harry's salvation in fan - made stories.
If the dark side saves Harry in fanfiction, it could open up a whole new world of story possibilities. Maybe it would involve Harry having to confront his preconceived notions about good and evil and find a way to balance the powers within him.
The dark side can offer Harry a different perspective on magic. In fanfiction, this could mean that he starts to see the limitations of traditional 'good' magic and finds new ways to combine or manipulate magic by incorporating elements from the dark side. This can make his magical abilities more versatile and powerful.
Well, one possibility could be that Harry is driven by a deep sense of betrayal. Maybe he discovers some dark secrets about the wizarding world that make him question everything he has believed in. For example, if he finds out that Dumbledore has been using him all along for some self - serving purpose. This could push him towards the dark side as he feels that the so - called good side is just as corrupt.