In some fanfics, there could be a plot twist where the Wizengamot itself is under the influence of a spell. So, the whole trial is a setup not just for Harry but for a larger scheme to undermine the Ministry of Magic. This would mean that Harry has to not only prove his innocence but also expose the real threat to the wizarding world.
Well, in some fanfictions, a plot twist could be that a character thought to be on Harry's side in the Wizengamot trial actually has a hidden agenda. Maybe they are being blackmailed by Voldemort's supporters. Also, it could be that the magical creatures of Hogwarts, like the house - elves, come forward with evidence that no one expected, which completely turns the trial around. For example, they might have witnessed something crucial that the wizards overlooked.
Obviously, Harry Potter is a key character. He is the one on trial, so the whole story revolves around him trying to prove his innocence.
There are fanfics where the Wizengamot is reformed by Hermione. In these stories, she uses her intelligence and knowledge of the law to make the Wizengamot more just. This often involves her facing a lot of opposition from the old - guard pure - bloods who want to keep things as they are. It makes for a great story as it combines Hermione's character traits with the complex political structure of the wizarding world.
Obviously, Harry Potter himself is one of the most common. Then there's Dumbledore who often plays a role, either as a supporter or as someone with a complex plan. Hermione is also common as she uses her intelligence to help Harry in the trial.
Perhaps a plot twist where the dark magic that was thought to be vanquished resurfaces in a new form. The fanfic might explore how the wizarding world, still recovering from the war, has to deal with this new threat. It could be that old spells are combined in new and dangerous ways by a group of rogue wizards.
One interesting plot twist could be that the basilisk has an unexpected ally. Maybe a house - elf that has been secretly communicating with it for some reason. This would completely change the dynamic as it adds an element of mystery and betrayal within Hogwarts.
In some 'Harry Potter and the Dursleys' fanfics, there's a plot twist where the Dursleys are actually protecting Harry from a greater threat that the wizarding world doesn't even know about. They've been cruel to keep him close and safe. Also, there could be a twist where Vernon Dursley has a connection to the wizarding world through his family's past that he's been trying to hide all along, which changes how we view his hatred for magic.
Well, perhaps in the 'harry potter in the order fanfic', a major character's magical ability is suddenly revealed to be much different than what was originally thought. Like Hermione, who was always known for her book smarts, might have a hidden and extremely powerful combat - based magic that gets uncovered during a crucial battle. This would completely change the dynamics of how she is perceived within the Order and how she can contribute to their cause.
Well, perhaps the gamer is transported into the Harry Potter world at a crucial moment, like during the Battle of Hogwarts. But instead of just joining the fight as expected, they discover a hidden passage in the castle that leads to a powerful magical artifact that can turn the tide of the battle in a very unexpected way.
In the 'Harry Potter and the Twists of Fate Fanfic', a possible plot twist could be that the way magic works is suddenly changed. Maybe spells that were thought to be dark are actually the key to solving a great mystery. This would force the characters to re - evaluate their understanding of magic and their place in the wizarding world. It would also create new challenges and opportunities for the characters, leading to a whole new set of adventures and conflicts.