Who could be the main antagonist in a 'Harry Potter came out of the darkness' fanfic?

Another possibility is Luna Lovegood. She has a unique perspective on the wizarding world. In the fanfiction, she could be the one to lead others out of the darkness. Maybe she discovers a hidden power within herself that can dispel a great darkness that has fallen over Hogwarts. Her quirky nature and deep understanding of the unseen could play a crucial role in the story.

One possible plot could be that Harry, after facing a great personal loss or a moral dilemma, briefly succumbs to the dark side. He might start using dark magic in secret. However, through the love and support of his friends like Hermione and Ron, he realizes the error of his ways. They remind him of the values he once held dear, and slowly he battles his inner demons and emerges from the darkness, stronger and more determined to fight against Voldemort and true evil.

It could be a powerful dark wizard who wants to use Sakura's powers for his own evil purposes. He might be constantly trying to capture her or manipulate her into doing his bidding.

The main antagonist could be a powerful necromancer who combines the dark arts of Skyrim with some elements of Voldemort - like magic. He could be raising an army of the undead and causing chaos across Skyrim, which Harry has to stop.

It could be a new dark wizard who has a vendetta against Harry. This wizard might use a spell to stop Harry from eating, thinking it will weaken him before a final showdown. He could be someone who was once a follower of Voldemort and now wants to take his place and prove himself by getting rid of Harry.

Maybe an ancient evil spirit that was once bound but is now trying to break free by using the summoner as a conduit. This spirit could be manipulating events from the shadows, causing chaos in the wizarding world to draw the summoner out.

There's not enough information to determine the main characters precisely. However, it could be a side character from the original source material that the author of the fanfiction decides to focus on. This character might have been overlooked in the original but now has their own story of emerging from the darkness, perhaps a character who was bullied in a school - based story.

I'm not entirely sure as it depends on the specific fanfiction. It could be a character who has been through a lot, like a war veteran who has finally come out of the mental and emotional darkness of war. Maybe it's a young person who has overcome an abusive situation at home.

A group of power - hungry shinobi from a hidden village could be the main antagonists. They see the 'angel of darkness' as a weapon that they can use to gain supremacy over other villages. They start a series of attacks and schemes to capture the angel, putting Naruto and his allies in a difficult position as they try to protect it and keep the peace in the ninja world.

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.