Well, in some 'Harry Potter Switches Sides' fanfictions, Harry might switch sides because of a personal betrayal. For example, if he feels that Dumbledore has been using him all along and hiding crucial information from him. He could then turn to the side that seems to offer him more honesty, even if it's the 'dark side'. Also, there could be a scenario where he falls in love with a character from the other side, like a Death Eater's daughter, and this relationship makes him reevaluate his stance.
One interesting scenario could be Harry realizing that the so - called 'dark side' has been misrepresented. Maybe he discovers that the Death Eaters have some valid grievances against the Ministry's corruption, which makes him question his allegiance. Another could be that he's influenced by a powerful dark magic artifact that makes him see things from Voldemort's perspective, at least temporarily.
In this type of fanfiction, a really fascinating scenario is when Harry is sent back in time and experiences the wizarding world from a different angle. He might see how the roots of the conflict were planted long ago and how the 'dark side' has been shaped by historical events. This new understanding could lead him to switch sides. He could also find out that there are some powerful spells or magic only accessible to those on the 'dark side' that he believes could be used for good, if he was in control, which prompts his change in allegiance.
Another plotline could involve Harry being betrayed by the Order of the Phoenix. Feeling hurt and lost, he decides to side with Voldemort out of revenge. However, as he gets closer to the dark side, he realizes that Voldemort's true nature is far more evil than he thought and has a change of heart.
Obviously, Harry Potter himself is the central character as the title implies. Voldemort is also often involved as the main figure on the 'dark side' that Harry might switch to or interact with differently. Then there's Snape. His complex relationship with Harry could be a key factor in the story. In some fanfictions, he might be the one who either tempts Harry to switch sides or tries to prevent it depending on his own motives.
Obviously, Harry Potter himself is the central character as the story revolves around his switching sides. Hermione and Ron also play significant roles. When Harry starts to show signs of siding with the dark side, Hermione might try to use her intelligence to figure out what's wrong and bring him back. Ron, on the other hand, could be more impulsive in his reactions, either trying to fight Harry if he becomes a threat or trying to persuade him to return to the good side.
In a 'Draco switches sides' fanfiction, it might start with Draco being disillusioned with his family's long - standing loyalty to Voldemort. His experiences at Hogwarts, especially his interactions with some of the more morally upright students like Hermione or Harry, could gradually nudge him towards the other side. He might first resist the idea but then, after a major event, such as seeing an innocent person being brutally attacked by Death Eaters, he decides to switch sides and use his position within the Death Eaters to undermine them from within.
One interesting scenario could be shopping for magical pets in Diagon Alley. In some fanfictions, characters might discover rare and unique creatures that are not typically found in the original books. For example, a magical hybrid of a phoenix and a cat that can both fly and purr.
Well, there are dueling scenarios where characters from different generations meet in a magical duel. For example, a character from Harry's time might accidentally travel back and duel with a student from the Marauders' era. This can lead to some really creative uses of magic as they try to outwit each other with different spells and strategies they've learned in their respective times.
One interesting scenario could be an OC who is a muggle - born wizard but has unique magical abilities not seen in regular wizards. For example, they might be able to communicate with magical creatures in a way that no one else can.
A common boggart scenario in fanfiction is related to the characters' insecurities. For Harry, it could be that the boggart shows him as the cause of all his friends' misfortunes, emphasizing his fear of being a burden or a danger to those he loves. This can add more depth to his character and explore his self - doubts further.
One interesting scenario could be when the characters are in detention and they discover a hidden magical object. For example, in some fanfictions, Harry and his friends might find an old, enchanted diary during detention in the castle. This diary could hold secrets or be a portal to another time or place.
One interesting 'last will' scenario could be a character leaving behind a powerful magical artifact in their will. For example, a wizard might leave a wand with special properties to Harry Potter, which could be a key to defeating a new dark force. This would add an extra layer of mystery and power to the story.