One way is to make the war vet a new neighbor of Peter Parker. They start to bond over their shared sense of duty. The vet shares stories of his war days, and Peter, in turn, tells him about his life as Spider - Man without revealing his identity at first. Eventually, the vet figures it out and becomes a trusted confidant, helping Spider - Man in small but important ways like providing information on potential threats he overheard in the neighborhood.
A war vet can be incorporated as a mentor figure. He could teach Spider - Man some combat techniques he learned in the military. For example, hand - to - hand combat moves that are different from what Spider - Man already knows, which would make him more effective in close - quarter battles.
One interesting plot could be a war vet who, after coming back from war, finds solace in the adventures of Spider - Man. He starts to see parallels between his own battles and the ones Spider - Man faces in New York. Maybe he even imagines himself having Spider - Man's powers to deal with the PTSD and the challenges of readjusting to civilian life.
One great war vet Spiderman time travel fanfic is 'Spiderman: Through the Wars of Time'. It has an amazing plot where Peter Parker, as a war vet, gets sent back in time during a battle. The author does a great job of showing how his combat skills and Spiderman abilities interact in different historical settings.
One common theme is redemption. The war vet Spiderman may have done things in war that he regrets, and time travel gives him a chance to fix things or make amends. Another theme is the clash of values. Different eras have different values, and as he travels through time, he has to reconcile his modern - day values with those of the past.
He could be a new recruit. The Avengers are always looking for new talent, and Spider - Man's abilities would be a great addition. He could start off as a bit of an outsider, trying to fit in with the more experienced heroes.
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.
His relationship with Aunt May would likely become more strained as she becomes overprotective, fearing she could lose him too. With his friends at school, he might become more distant as he is preoccupied with superhero duties. He could also be more cautious around MJ, not wanting to put her in danger in the new, more dangerous world.
It could be a new character with unique powers or a variant of an existing spider. Maybe it's a spider from a different dimension with special abilities.
You could have a character use some sort of special weapon or gadget designed to deal with spiders. Maybe a high-tech spray or a laser device.
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.
A spider could be a villain in the pulp fiction story. For example, it could be a man - sized or even larger spider that attacks the characters.