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.
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.
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.
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.
In fanfiction, if Spider - Man becomes a spider, it would be a total transformation. His identity as Peter Parker would be almost completely lost. He would have to adapt to a new body structure. His suit might not fit him anymore, and he would need to find a new way to protect himself. Also, his enemies might not recognize him, which could be both an advantage and a disadvantage in his battles.
One possibility in this fanfiction scenario is that Naruto is seeking a new form of power to protect his village. He somehow makes a deal with a demon or entity related to the Ghost Rider. This entity sees Naruto's strong will and determination and decides to bestow upon him the powers of the Ghost Rider. Naruto's existing abilities like his Rasengan could be infused with the Ghost Rider's powers, creating a whole new and unique attack. His ability to move at high speeds as a ninja would also be enhanced by the Ghost Rider's superhuman strength and agility.
If Spider - Man becomes a spider in fanfiction, the story might focus on his struggle to regain his humanity. He could encounter a magic spell or some advanced technology that has the potential to transform him back. Along the way, he would learn more about the spider world and how it differs from the human world. He could also meet other creatures that are half - human and half - spider, and they could either help or hinder his journey.
Well, his sense of humor could disappear. Spider Man is known for his quippy remarks, but as Toxin, he may be too focused on his new, darker nature. His sense of justice might also get distorted. Instead of just stopping criminals, he could start to punish them more severely. He may view the world in a more black - and - white way, with less room for redemption for the bad guys. Also, his relationships with other superheroes could change. Some may be afraid of him now, while others may try to bring him back to his old self.