One interesting plotline could be Spider - Man trying to regain the trust of the public. After the events of Civil War, he might be seen as a bit of a wildcard. So, he could be doing small - scale heroics to show that he's still on the side of the good. For example, helping out at local charities or stopping petty crimes in a very public way to win back the hearts of the people.
The Vulture could be a new and more menacing villain. Maybe he's using the post - Civil War chaos to his advantage, stealing high - tech equipment that was left unguarded during the Avenger's split. He could be targeting Spider - Man specifically, seeing him as an easy target now that he doesn't have the full support of the Avengers.
One idea could be that Peter Parker decides to unmask himself as a political statement during the Civil War. He might feel that the secrecy in the superhero community is causing more harm than good and by unmasking, he hopes to start a new era of transparency among heroes.
Well, if Spider - Man died in a Civil War fanfiction, it could be that his death serves as a catalyst for the end of the war. His death might make both sides realize how pointless their fighting is. Maybe the heroes would then come together to honor his memory and try to make amends. His friends in the superhero community, like Ned if he knew about Peter's identity, would be heartbroken. And villains might take advantage of the situation, thinking the heroes are weakened without Spider - Man, which could lead to new threats emerging in the fanfiction world.
In a fanfiction, Spider - Man could also die due to friendly fire. With the heroes split in the Civil War and the chaos of battle, it's possible that a misaimed attack from one of the heroes accidentally hits Spider - Man and causes his death.
One great fanfiction could be about Spider - Man's internal struggle during the events of 'Captain America: Civil War'. He's a new addition to this complex world of superhero politics. He might be initially excited to be part of the fight, but then starts to question the motives of both sides. Maybe he tries to find a middle ground, using his unique perspective as a young hero who hasn't been jaded by years of superhero rivalries.
Spider-Man's age in the Civil War comics varies depending on the specific storyline and interpretation. Generally, though, he's around 18-21 years old.
Perhaps Spider - Man starts to train harder in order to be better prepared for future threats. He could seek out new mentors, like Doctor Strange if he's still around. He might also get involved in some sort of community rebuilding effort, using his powers to help the common people who are now in a state of chaos and fear.