It could be about a trial within the Harry Potter universe created by a fan. Maybe it's a trial of a character for a crime they're wrongly accused of, like Harry being put on trial for using magic outside of Hogwarts again. It might explore new aspects of the wizarding legal system and how characters deal with it.
Well, if the trial is about a Hogwarts student who is in trouble, then Neville could be one of the main characters. Or if it's a trial related to the dark side, Draco Malfoy could play a significant role. It's also possible that some minor characters from the original books, like Luna Lovegood, could become main characters in this fanfiction if they are somehow closely related to the trial, for example, if they have crucial evidence or are the ones being accused.
They are often portrayed as the villains. Their years of treating Harry badly are brought to light. They might look scared and out of place in the wizarding courtroom, with all its strange sights and magic.
I'm not sure specifically as there could be many different plots in fanfictions about this. But generally, it might involve a trial where Veritaserum (the truth - telling potion) is used in the Harry Potter universe. Maybe a character is wrongly accused and the Veritaserum is crucial in revealing the truth, or perhaps it's misused in the trial, causing chaos and unexpected revelations.
In many Harry Potter fanfics, when it comes to lordships being revealed at a trial, it could be that Harry is revealed to be a lord in a way that completely changes his social standing. For example, he could be a lord over a particular magical territory or have a special status among the pure - blood families. This might be due to some long - lost family connection or a prophecy - related discovery. The trial could be a means to expose the truth about his true identity and the power and responsibilities that come with this newly discovered lordship. It could also lead to new alliances and enemies as other characters in the wizarding world react to his new - found status.
A trial where a Death Eater from the past is brought back to face justice. This could show the new magical laws and how they deal with old - time villains. It could also explore the reactions of the current wizarding community towards such a trial. There could be a lot of drama as secrets from the past are revealed during the trial.
The fanfic could start with Harry being called to trial for something like using underage magic, which he didn't actually do. He is angry because he has been through so much already, fighting Voldemort and his Death Eaters, and now he has to face this unjust trial. His anger could fuel him to find evidence on his own to prove his innocence. He might start investigating who really cast the magic in question, leading him on a new adventure while still in the middle of the trial drama.
In a Harry Potter Umbridge trial fanfiction, Umbridge could finally be held accountable for her cruel actions at Hogwarts. Maybe she'd be tried for her abuse of power, like using the blood - quill on students. The Wizengamot might hear testimonies from students like Harry, Hermione, and Neville about the unjust punishments and the way she ran the school tyrannically.
Hermione Granger might also be a main character. Her intelligence would be very useful in a smart trial scenario. She could be using her vast knowledge of magic and books to help someone during the trial.