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.
One possible scenario is that a dark wizard, who was once an enemy, realizes that a common enemy threatens both him and Harry. So, he uses his dark magic to help Harry defeat this new threat. Another could be that the dark side holds a certain magic or knowledge that is the only way to save Harry from a deadly curse. For example, a dark ritual might be the key to breaking a spell on Harry.
A key element would be the relationship between Ahsoka and Anakin. Their history, trust, and mutual understanding play a big role. Another element is the nature of the dark side's hold on Anakin. Understanding what led him to the edge of the dark side is crucial. For example, if it was his fear for Padmé's life, then Ahsoka would have to address that fear somehow.
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.
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.
One great fanfiction that explores the dark side in the Harry Potter universe is 'The Darkening of Hogwarts'. It delves into what would happen if dark magic seeped deeper into the school. The characters are faced with moral dilemmas and the story shows how the allure of the dark side can be both tempting and terrifying.
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.
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.
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.
Some 'Harry Potter dark side fanfiction' might focus on Draco Malfoy's journey further into the dark side. For example, a story could depict Draco as being trained by Bellatrix to become an even more ruthless Death Eater. Or it could be about how the dark side affects the Hogwarts houses, like Slytherin completely embracing the dark arts and the chaos that ensues within the school as a result. It can be really fascinating to see how different characters are changed by the allure of the dark side in these fanfictions.