Who could be the main villain in a Spiderman Civil War fanfic?

It could be Mysterio. He's known for his illusions and deception. In the context of a civil war, he could use his powers to create false scenarios that make the heroes fight each other even more. He might pretend to be a hero on one side, but secretly be working to make the conflict worse for his own gain.

There's also a possibility that a new, original villain could be introduced. For example, a scientist who was wronged by the superhero community in the past and now wants revenge. He could create powerful weapons and technology that can counter the superheroes' powers, and he uses the divide in the Civil War to pick them off one by one.

Loki could be a great main villain. He could be secretly fueling the Civil War for his own gain, like trying to take over Asgard while everyone is distracted. He has the cunning and the motivation to do so.

A new supervillain could emerge. Maybe a scientist who got access to some of the leftover technology from the Civil War battles and uses it to create a powerful weapon. He then targets Spiderman because he represents the superhero community.

Well, one way could be that in the chaos of the Civil War, Spiderman might be caught in the crossfire between the two sides. Maybe he tries to stop a particularly violent clash and gets overpowered by the combined forces accidentally. Another possibility is that he's betrayed by someone he trusts on one of the sides, leading to his demise.

Maybe a biologist gone bad. He has been studying the worm and discovers that its cells can be used to create a powerful mutagen that can turn ordinary people into super - strong minions. He plans to create an army and take over the city. Spiderman has to stop him from using the worm in this way. And the worm, being an innocent creature, becomes a key piece in this battle between good and evil.

The Green Goblin could be a great main villain. He has a long - standing feud with Spiderman, and when the Avengers get involved, it could make the situation even more complex. His flying glider and pumpkin bombs would pose a serious threat to both Spiderman and the Avengers.

The Green Goblin could still be the main villain. He might see the transformed Spiderman as an easier target now that she's a girl, or he could be even more enraged by the change and be more determined to defeat her.

A padawan who has just come of age and is now thrust into the chaos of the civil war could be a main character. Their inexperience and fresh perspective could add an interesting dynamic.

Mr. Sinister could be a great antagonist. He's always interested in mutant genetics and power. He could be the one secretly pulling the strings, making Cable and Deadpool believe they need to fight over the future of mutantkind. He could plant false evidence or use his mind - control abilities on some of the supporting characters to fuel the conflict.