Who would be the main antagonist in a 'Harry Potter and Rosalie Cullen fanfiction'?

One possible plot could be that Harry, through some magical accident, finds himself in the world of Rosalie Cullen. They initially clash due to their different natures, but gradually find a connection. Another could be that a dark force threatens both their worlds, and they have to team up as mates to fight it.

Yes, there are likely some well - written ones out there. There are many talented fanfiction writers who might have explored this unique crossover concept. You can start by looking on popular fanfiction websites like FanFiction.net or Archive of Our Own. However, the quality can vary greatly, so you may need to read through a few to find one that really grabs you.

Voldemort could be the main antagonist. He might see Alice's vampire abilities as a threat and want to use Harry to get to her. He could also be interested in using her powers for his own dark purposes.

It could be a power - hungry alien leader who wants to take over Hogwarts and use its magic for their own empire.

A dark wizard from the Harry Potter universe could be the main antagonist. Maybe a follower of Voldemort who escaped the final battle and found his way to Byakko's world. He sees the power of Byakko and wants to use it for his own evil purposes. He could try to enslave Byakko and use its power to take over both the wizarding world and Byakko's realm.

In a 'Harry Potter trained by Goku' fanfiction, the main antagonist could be an evil wizard who has allied himself with dark forces from other dimensions. This wizard could see Harry, with his new skills from Goku's training, as a major threat to his plans of world domination. He might have powers that are a mix of dark magic and some sort of energy manipulation similar to ki. Harry would then have to use his combined magic and Goku - trained skills to take on this powerful and devious enemy.

It could be Voldemort who somehow gets his hands on Oscorp technology and uses it to make his dark magic even more powerful. He would be a formidable foe for both Harry and Peter, as he has his own army of Death Eaters and now enhanced powers. Harry would use his magic and Peter his superpowers to fight against Voldemort's new - found strength.

Most likely, Medusa would be the main antagonist. Her ability to turn people to stone makes her a very dangerous foe for Harry Potter and the other characters in the wizarding world.

In this type of fanfiction, Voldemort could still be the main antagonist. But the way Harry approaches him would be very different. With Riddick's influence, Harry might see Voldemort as just another powerful enemy to be taken down in a more direct, perhaps violent way, rather than through the more magical and somewhat convoluted ways in the original series.

It could be Voldemort and Loki. Voldemort, being the main villain in the Harry Potter series, is power - hungry and wants to rule the wizarding world. Loki, from the God of Thunder universe, is known for his trickery and his own desires for power. They could team up, thinking that they can use each other to achieve their goals. Voldemort could be interested in Loki's ability to deceive and Loki could see the potential in Voldemort's dark magic. They would be a formidable pair against Harry Potter and Thor.