One interesting storyline could be about how Spider - Man manages his relationships with different characters in the harem while still fighting crime. Maybe he has to balance his time between going on dates with his love interests and saving the city from villains.
One unique storyline could be a different origin for one of Spider - Man's villains within the context of this fanfiction. Maybe the Green Goblin has a new backstory that ties into a lemon grove, which gives him his powers in a strange and unexpected way.
One interesting story could be about Spider - Man teaming up with a new, unexpected ally. Maybe a villain who has a change of heart and decides to help him fight a greater evil in the fanfiction world. This would add a new dynamic to the usual Spider - Man battles.
One idea could be exploring a different origin story for Spider - Man in the fanfiction. Maybe he gets his powers from a scientific experiment gone wrong in a completely new way. For example, instead of being bitten by a radioactive spider, he could be exposed to a mutagenic serum that gives him spider - like abilities along with some unique side - effects that he has to deal with.
One popular storyline is Venom teaming up with other villains. This creates a bigger threat for Spider - Man. Another is Venom trying to take over the city. His symbiotic powers give him an edge in such a plot.
Well, a great storyline might be the symbiote causing Spider - Man to have moral dilemmas. Since the symbiote can be a bit dark, it could push Spider - Man to cross lines he normally wouldn't. For example, using excessive force against criminals. Also, there could be a story where the symbiote's origin is explored more deeply in the fanfiction. Maybe it has a connection to an ancient evil that Spider - Man has to uncover. Another idea is that the symbiote starts to affect Spider - Man's perception of reality, making him see enemies where there are none at first.
One good storyline could be Black Cat and Spider - Man teaming up to take down a new super - villain in the city. Maybe a villain who has the ability to steal powers, and they have to figure out how to stop him while also dealing with their own complicated relationship.
Black Cat could be in the harem as well. She has a flirty and complex relationship with Spider - Man. Then there are other characters like Felicia Hardy who might be included. Her cat - burglar persona and her feelings for Spider - Man could make for an exciting addition to the group of characters in the fanfiction.
One popular storyline could be about Spider - Man facing a new and powerful villain that is not in the original series. For example, a villain with the power to control time. This would put Spider - Man in a really tough situation as he has to figure out how to defeat someone who can manipulate time against him.
One idea could be exploring the relationship between Spider - Man 2099 and other superheroes in the future. Maybe he teams up with a new group of heroes to fight a powerful villain who threatens the entire city.
In a more complex plot, a mysterious new villain with mind - control abilities kidnaps a fan who has a special connection to Spider - Man, like they were at the scene of one of his early battles and their story inspired Spider - Man. The villain wants to use the fan's memories and emotions to create a weapon against Spider - Man. Spider - Man has to figure out the villain's plan and save the fan before it's too late.