Well, they could team up to fight a common enemy. Maybe a powerful demon that's causing chaos in the city. Spider - Man's agility and Ghost Rider's hellish powers would make for an interesting combination.
A really cool plot twist could be that there is a parallel universe where Spider - Man and Ghost Rider are enemies. And in the fanfiction, elements from that universe start seeping into their world, causing confusion and making them question their alliance. This would bring in a whole new level of complexity to the story, with alternate versions of themselves causing chaos and making them fight not only external threats but also their own inner demons about who they really are.
He would definitely gain the ability to manipulate hellfire. So instead of just shooting webs, he could also shoot out streams of hellfire to either attack his enemies or create barriers. His super strength and agility would likely be enhanced by the demonic power of Ghost Rider. Also, he would get the Penance Stare. With this, he could make his enemies experience all the pain they've ever inflicted on others just by looking at them, which is a very powerful weapon in his new arsenal.
One interesting storyline could be Ghost Rider and Spider - Man teaming up to take on a powerful demon that has escaped from the underworld and is causing chaos in New York. Spider - Man's agility and intelligence combined with Ghost Rider's hellish powers would make for an epic battle.
Ghost Rider is often brooding and driven by his mission of vengeance, while Spider - Man is more quippy and light - hearted. Their personalities could clash when Ghost Rider thinks Spider - Man is too carefree in the face of danger. But they could also blend well, with Spider - Man's humor lightening Ghost Rider's dark mood at times.
It might start with Spider - Man being exposed to a cursed artifact. This artifact could be related to the origin of Ghost Rider. For example, if it was an ancient amulet that once belonged to a Ghost Rider. Spider - Man, being curious as always, investigates it and accidentally activates its power. The dark energy within the amulet starts to change him, slowly turning him into a being with the powers and characteristics of Ghost Rider. His suit could start to change, taking on elements of Ghost Rider's flaming skull and chain - wielding abilities.
The Vulture could also be a major antagonist. His ability to fly and his sharp talons pose a great threat. Maybe he teams up with some other villains in the fanfiction to take on the two spiders at once. He could be stealing valuable items from around the city and Spider - Man and Spider - Gwen have to stop him.
One possible villain could be Doctor Octopus. He might be back with some new and improved mechanical arms, and he wants to prove that he's the superior scientist and villain by defeating both Spider Man and Spider Girl.
Well, it could be about them teaming up to fight a new supervillain in the city. Maybe they start off not getting along because they have different fighting styles, but then they learn from each other and become great partners.
Well, one possibility could be that they team up to fight a new super - villain in the city. Maybe this villain has some special powers that require both of their unique skills to defeat.