One plot could be that in a dark version, Harry and Luna team up to expose a hidden, evil regime within the wizarding world that has been secretly controlling things from the shadows. They might have to use some rather unorthodox and darker magic to do so.
In a dark fanfiction, perhaps Harry and Luna discover a dark prophecy that seems to be leading the wizarding world to destruction. They struggle against time and powerful dark wizards who want to fulfill this prophecy. Harry, with his combat skills, and Luna, with her out - of - the - box thinking, form an unlikely duo to fight against this impending doom.
A possible plot is that Harry, influenced by some dark force, and Luna tries to bring him back. Luna could be the only one who can reach Harry's true self as she has a unique understanding of the magical world. In this story, they go on a journey filled with challenges where Luna uses her wisdom to counter the dark magic affecting Harry.
One plot could be that in a dark world, Harry Potter is influenced by dark magic and Tonks, with her Metamorphmagus abilities, tries to spy on him for the Order but gets caught in his web of newfound power. She has to then fight her own feelings as she was once his ally.
In some WBWL fanfictions, Harry is ostracized by the wizarding world because they believe he's not the 'true' savior. This makes him turn dark. He might form an alliance with Voldemort's followers out of spite. The plots often explore how his personality changes. He could become more ruthless and calculating, using his natural magical talent in ways that are more self - serving rather than for the greater good.
One interesting plot could be Harry Potter using his intelligence to outwit the Dark Lord in a completely different way than in the original series. For example, instead of relying on pure magic power, he uses his knowledge of magical history and lore to find the Dark Lord's weaknesses. Another plot might involve the Dark Lord having a more complex and intelligent personality, making his actions less predictable and more thought - out. This could lead to a more cat - and - mouse - like battle between Harry and him, with both sides constantly strategizing.
One possible plot could be that the female vampire is initially an enemy but then becomes an ally to Harry. Maybe she has some information about Voldemort's dark magic that is linked to her vampire lore. Another plot could be a love story where Harry has to overcome the fact that she's a vampire and deal with the wizarding world's reaction to their relationship.
One possible plot could be that female Harry Potter is wrongly accused and sent to Azkaban. There, she discovers a hidden conspiracy within the prison walls. Maybe she finds out that some dark wizards are using Azkaban as a base to plan an attack on Hogwarts. Another plot might involve her using her unique magic skills, different from the male Harry Potter's in some ways, to survive the Dementors and break free, all while uncovering the truth about her false imprisonment.
The plot where Murtagh teaches Harry some of his unique magic techniques is really cool. It shows how different magical systems can interact. For example, in a fanfic I read, Murtagh showed Harry how to use a spell that was common in his world but unheard of in Hogwarts.
One plot could be that Snape, under some dark magic influence, forces Harry to accompany him on a dangerous mission to retrieve a lost magical artifact. Snape believes Harry has some hidden power that can help. Another could be Snape forcing Harry to study a very advanced and dangerous form of magic, thinking it will protect Harry in the long run. And there could also be a plot where Snape forces Harry to enter a magically sealed area to face some long - forgotten threat that only Harry can potentially defeat.
One interesting plot could be that after Harry's death, his friends find a powerful ancient spell in the Room of Requirement. This spell was created long ago by a powerful wizard who also faced death unfairly. They manage to perform the spell and it brings Harry back. But he returns with some new powers that he has to learn to control. He also has a connection to the spirit world now, which helps him in his new battles against the remaining dark forces.
Perhaps Davy Jones' locker has a connection to the Chamber of Secrets. In the fanfiction, Harry discovers this link and has to journey into Davy Jones' locker to find a way to defeat Voldemort. Along the way, he has to face the horrors of the locker, including Davy Jones himself and his crew of the Flying Dutchman. This could be a really dark and exciting adventure.
One possible plot could be Luna being overly possessive of Harry in a way that surprises him. For example, she might try to keep him away from his other friends at Hogwarts, thinking they are a bad influence on him. Another plot could be Luna using her unique magical abilities in rather extreme ways to protect Harry from perceived threats.