First, focus on creating a well - developed OC. Give them a unique personality, backstory, and set of goals. For example, if your OC is a tech - genius who is inspired by both Spider - Man and the Prowler, explain how they got into that field and what drives them. Second, build a strong plot. Maybe start with a small - scale conflict like a local crime wave that your OC gets involved in, and gradually escalate it to a city - wide threat. Third, use vivid descriptions. When writing about Spider - Man's web - slinging or the Prowler's stealthy movements, make the reader feel like they are there.
One idea could be to create an OC (Original Character) who is related to the Prowler in some way and has a complex relationship with Spider - Man. For example, the OC could be a former ally of the Prowler who is now trying to reform and help Spider - Man fight crime in the neighborhood. This would add a new layer of drama and character development to the fanfiction.
One common storyline is the Prowler starting off as an antagonist to Spider - Man. He might be involved in crimes that Spider - Man has to stop. Another is a redemption arc for the Prowler, where he realizes the error of his ways and teams up with Spider - Man. Sometimes, there are stories where the Prowler's identity is a mystery at first, and Spider - Man has to figure it out while dealing with his crimes.
In fanfiction, the Prowler can sometimes be more sympathetic towards Spider - Man compared to the original. Maybe he sees the good in Spider - Man's actions more quickly. In the original, he might be more straightforwardly a villain, but in fanfiction, he could be a complex anti - hero who has moments of understanding with Spider - Man.
Well, maybe he's got some secret mission that he doesn't want the Avengers to interfere with. You know, like protecting a particular person or some crucial information that he thinks the Avengers might mess up if they get involved.