Iron Man isn't the villain in the Civil War comic. The conflict is more nuanced than having a clear villain. His actions are part of a larger debate about superhero responsibilities and the impact of their powers.
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.
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.
In many fanfics, Spider - Man could get injured in the Civil War scenario. Maybe he's facing off against stronger opponents like Captain America or Iron Man and gets overpowered. His inexperience compared to the older heroes might lead to him making mistakes and getting hurt.
Spider - Man could stop the Civil War in the fanfic by appealing to the moral compasses of the heroes. He could remind them of their original purpose - to protect the innocent. By showing them how their fighting is actually harming the very people they swore to protect, he could make them stop. Also, his webs could be used in a creative way. Maybe he could create some kind of web - based barrier between the two fighting sides to physically stop them from attacking each other while he talks some sense into them.
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.