In certain 'Harry Potter Wizengamot Trial Fanfiction', a great plot twist is when Harry uses an ancient and forgotten form of magic during the trial. This magic could be something that the Wizengamot has no knowledge of, so they are both shocked and unable to counter it. It could also be that Hermione, through her extensive research, uncovers a conspiracy within the Wizengamot itself. This conspiracy could involve some members trying to frame Harry not just for a single crime, but as part of a larger plan to take over 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.
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.
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.
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.
Well, one possibility is that Draco is on trial for his actions during the war. He might be trying to prove that he was acting under duress from Voldemort. The Wizengamot could be divided, with some believing he's truly a Death Eater at heart and others seeing his potential for redemption.
One interesting plot twist could be that Harry discovers he has the ability to communicate with the Basilisk on a deeper level than just Parseltongue. Maybe he can see through the Basilisk's eyes and use this to his advantage in uncovering secrets within Hogwarts that even Dumbledore doesn't know. Another could be that the Basilisk is not truly a villain but was being controlled by a dark force all along, and Harry has to find a way to break that control and free the Basilisk.
One interesting plot twist could be that the basilisk has an unexpected alliance. Maybe it teams up with a group of outcast magical creatures to take revenge on those who have wronged them. This would completely change the dynamic as in the original, the basilisk is mainly a tool of Voldemort.
In this fanfiction, a great plot twist might be that the gamer's knowledge of game strategies is used to outwit Voldemort in a completely unexpected way. Instead of a traditional magical duel, the gamer uses their understanding of leveling up and collecting power - ups to somehow weaken Voldemort's magic. Maybe they find a way to 'hack' into his dark magic, using skills from the game world that no one in the wizarding world had thought of before.
Well, in some 'Harry Potter and the Prophecy' fanfiction, a plot twist could be that the prophecy was not a prophecy at all but a spell cast by an ancient wizard to set in motion a series of events for a greater purpose. For example, it was to bring about a new era of magic where Muggle - borns and pure - bloods could co - exist peacefully. This would completely change the way the characters view the prophecy and their roles in it. Also, the prophecy might be tied to a different character than Harry or Voldemort, like a minor character who suddenly becomes central to the whole story.
One interesting plot twist could be that instead of Ron leaving and coming back, Hermione actually leaves the group for a while because she discovers a dark secret about her family's past that she needs to figure out on her own. This would add a whole new layer of drama to the story.