Maybe it could be about a character, perhaps Harry himself, being corrupted and turning into a 'Prince of Darkness'. He could start using dark magic and turn against his friends and Hogwarts.
It could be an ancient and powerful dark wizard who has been dormant for a long time. Maybe someone from the time before Hogwarts was even founded.
It could be a new villain that the fanfiction author has introduced. Maybe a long - lost relative of Voldemort who has emerged to continue his dark legacy.
Perhaps it could be a corrupted version of one of the existing characters. For example, a character who has been influenced by dark magic and has turned into this 'prince of darkness'. It could be a Slytherin student who has delved too deep into the forbidden knowledge of the house and has become a dark force. Another possibility is that it's a long - lost relative of a major villain like Voldemort, carrying on his legacy in a new and terrifying way.
In Harry Potter fanfiction, 'The Prince of Darkness' could refer to a number of things. It might be a new character created by the fanfiction writer, perhaps a dark wizard or a powerful, malevolent being. It could also be a title given to an existing character in a new, dark context, like Voldemort being given this title to emphasize his extreme evilness.
The plot might center around Harry being the master of darkness as a way to subvert the prophecy. Instead of being the 'Chosen One' in the typical light - against - dark way, he uses the knowledge of the dark arts to understand and outwit Voldemort. He could be learning long - forgotten spells from the darkest corners of Hogwarts library and using them to his advantage.
Perhaps in this fanfiction, Harry Potter as the master of fire and darkness is called upon to save a different magical realm that is on the verge of destruction due to a dark force. His fire powers could be used for both destruction of the evil and for providing warmth and light in the desolate realm. His dark powers might help him understand the nature of the enemy better, like being able to sense their motives and weaknesses. He may also meet new magical creatures along the way that are drawn to his unique powers.
One possible plot could be that Harry discovers he has some long - lost royal heritage in the wizarding world. This new status as a prince might put him at the center of a power struggle between different wizarding families or factions. He could then have to navigate through political intrigue while still dealing with his normal Hogwarts life and the threat of Voldemort.
It depends on various factors. Some fanfiction works gain popularity within specific fan communities. 'Harry Potter' has a huge fan base, but a 'Prince of Darkness' - themed fanfiction might be popular among those who like darker, more alternative takes on the story. However, it may not be as mainstream as some other more canon - compliant fanfics.
Well, it could be about Harry's journey to fully embrace his role as a prince in Hogwarts. Maybe he discovers some long - lost royal heritage of the wizarding world that gives him new powers and responsibilities.
One possible plot could be that Harry Potter discovers his secret heritage as a Prince of England. This might lead to a whole new set of magical and political adventures. He could use his newfound status to reform the wizarding world's relationship with the Muggle government. Maybe he'd introduce magical solutions to some of the Muggle world's problems, all while still dealing with the usual threats in the wizarding world like Voldemort's followers.