Who could be potential villains in a Spider - Man supernatural crossover fanfiction?

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.

Well, obviously Mary Jane Watson is a top choice. She has a long - standing relationship with Spider Man in the original comics. Then there's Gwen Stacy, who also has a significant connection to him. Felicia Hardy, also known as Black Cat, with her flirty and adventurous nature would be a great addition. And we can't forget about Silk, Cindy Moon, who has her own unique powers and could bring an interesting dynamic to the harem. There could also be characters from other universes like Spider - Gwen if we're talking about a crossover situation.

The Vulture could be a new and more menacing villain. Maybe he's using the post - Civil War chaos to his advantage, stealing high - tech equipment that was left unguarded during the Avenger's split. He could be targeting Spider - Man specifically, seeing him as an easy target now that he doesn't have the full support of the Avengers.

In a crossover with the Marvel universe, Thanos could be a formidable villain. His desire to collect the Infinity Stones and his power would pose a huge threat to the Power Rangers SPD. The Rangers would have to team up with the Avengers to stand a chance against him.

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.

A really cool villain for them to face together could be a shape - shifter. This shape - shifter could take on the forms of their loved ones to trick them. But Spider - Man's spider - sense would give him a hint that something is wrong, and Supergirl's X - ray vision could help them figure out the real identity of the shape - shifter. Also, a villain with the power to control the weather on a global scale would be a great challenge. Supergirl could try to counter the extreme weather conditions, while Spider - Man swings around to rescue people in danger.

Gwen Stacy is an obvious choice. In different universes, she has different relationships with Spider - Man. Another could be Mary Jane. She has always been an important part of Spider - Man's life. Black Cat might also be in the harem as she has a complex and flirtatious relationship with Spider - Man in the comics.

There could be a new villain who is a master of illusions on a whole new level. This villain could create entire cities within illusions, trapping Spider - Man and making him question what is real and what is not. Another potential new villain could be a symbiotic - like being that attaches itself to other people and turns them into powerful minions. Spider - Man would have to not only fight these minions but also find a way to destroy the main symbiotic - like villain at the source.

The Green Goblin is very popular. His chaotic nature and personal vendetta against Spider - Man make for great storytelling in fanfiction.

A shadow - ninja character could be introduced. This character could be an anti - hero at first, with his own motives in the world of shadows, but later teams up with Spider - Man.