One idea could be exploring new alliances. For example, Spiderman might team up with some unexpected heroes during the civil war. Maybe he forms a bond with a young, new hero who is caught in the middle of the conflict.
A great plot idea for a Spiderman Civil War 2 fanfic could be the introduction of a new villain who takes advantage of the chaos of the civil war. This villain could manipulate both sides of the conflict, causing more strife between the superheroes. Spiderman then has to figure out who this new threat is and how to stop them while also dealing with the civil war situation.
Another plot could revolve around the moral dilemmas. Spiderman is often faced with tough choices. In a fanfic for Civil War 2, he could struggle with whether to follow the laws set by the superhero registration side or stay true to his own sense of justice that might oppose some of those laws. This could lead to internal conflict and interesting character development as he tries to balance his beliefs and the expectations of the superhero community.
One idea could be that Spider - Man tries to form his own group of heroes who are neutral in the Civil War. They could be a sort of mediator between Captain America and Iron Man's sides. For example, he recruits some lesser - known heroes like Daredevil or Jessica Jones.
One idea could be that Spiderman tries to rebuild his relationships with the Avengers who were on different sides during the Civil War. He could start by reaching out to Iron Man, trying to understand his point of view better and also explaining his own actions.
One idea could be Thor trying to keep the peace between two warring factions within Asgard during the Civil War. He might use his strength and wisdom to negotiate treaties.
Another plot could involve a group of Jedi who try to stay neutral during the civil war. They could form their own enclave and try to protect civilians caught in the crossfire. They'd face challenges from both warring sides who might see them as a threat or an opportunity.
One idea could be that Cable and Deadpool find themselves on opposite sides due to a misunderstanding about a new mutant - registration law. Cable believes in strict control to protect mutants in the long run, while Deadpool just wants chaos and freedom. Maybe Deadpool starts a prank war against Cable's side that accidentally escalates the situation.
Maybe in the fanfic, Hulk has a different view on the registration act. He could see it as a form of control, like how he was always being hunted. So he sides with the anti - registration side, but not without some internal struggle. After all, he doesn't fully trust any of the heroes at first. He might end up teaching them a lesson about freedom and acceptance.
One interesting plot twist could be that Peter Parker reveals his identity not because of the Sokovia Accords but to save a loved one from a villain who has specifically targeted him. For example, the villain might have kidnapped Aunt May and demands that Peter show his face to the world in exchange for her safety.
You might consider writing a civil war fanfic about a group of spies. They could be infiltrating enemy camps and trying to gather intelligence. Their actions could change the course of certain battles. For example, they might discover a secret plan for a major offensive and find a way to thwart it.
One idea could be a story where Spiderman has to team up with his greatest enemies to fight a new, more powerful threat from outer space. This would force him to put aside his differences and find common ground with the likes of Doctor Octopus and Green Goblin.
Maybe a plot where Spider - Man has to face a new villain who has the power to manipulate time. This would make for some really interesting battles and strategic thinking on Spider - Man's part. He would have to find a way to defeat the villain without getting caught in the time - warping chaos. Also, a story about Spider - Man traveling to an alternate dimension where his powers work differently could be cool.