Another potential villain could be an ancient Wakandan enemy that was once thought to be defeated. But with Spider - Man now in the role of king, they see it as an opportunity to strike. This enemy might have some dark magic or long - forgotten technology that they use against Wakanda. Spider - Man would have to quickly learn about this enemy's history and weaknesses in order to protect his new kingdom.
Doc Ock is a likely villain in Spider - Man angry fanfiction. His mechanical arms and his intelligence make him a formidable foe. His evil plans usually put the city in danger, and Spider - Man would be extremely angry trying to stop him. Also, Electro could be a villain in such fanfictions. His ability to control electricity can cause a lot of destruction, and Spider - Man would be angry at his disregard for human life while causing chaos.
Well, he could protect villains in fanfiction by ensuring they get a fair trial. Spider - Man, being the morally upright hero he is, might believe that everyone, even villains, deserve justice. So he could protect them from vigilante attacks or mob justice until they can be properly dealt with by the legal system.
The Shriek can be really interesting in fanfiction. Her sonic powers can be explored in unique ways, like how she uses them not just for destruction but also to manipulate situations or people around Spider - Man.
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.
There could be a genetic engineer gone bad. This villain creates dangerous hybrid creatures and releases them in the city, forcing Spider - Man 2099 to fight these unpredictable beasts. He might also have to figure out how to reverse the genetic mutations.
Doctor Octopus is another great option. His mechanical tentacles and his high - level intellect pose a significant threat. You could write a story where he creates a new, more powerful set of tentacles that Spider - Man has to figure out how to defeat.
Well, the Kingpin could be a main villain. He could see Naruto as a threat to his criminal empire in New York. He might hire some ninja mercenaries from the Naruto universe to take him down. And then there's Electro, who could be enhanced by some sort of chakra - based technology. He could use his new powers to cause chaos in the city and target Naruto specifically, thinking that he's the key to getting even more power.
The Lizard could be turned into a more supernatural villain. Maybe he gets possessed by an ancient spirit that makes him not only stronger but also able to control other reptiles with dark magic. This would pose a huge threat to Spider - Man as he has to deal with the Lizard's new powers on top of his already dangerous physical abilities.