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 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.
Spider - Man himself, Peter Parker, is obviously one of the most popular. He is the central character, and fans love to read about his adventures, his struggles with his powers, and his attempts to balance his normal life with his superhero identity.
I'm not really sure about specific 'Spider - Man tortured' fanfictions as it's not a very common or positive theme. However, some fanfiction websites like Archive of Our Own might have such works. But most of the popular Spider - Man fanfictions usually focus on his heroic deeds, relationships, or crossovers with other superheroes rather than torture themes.
The 'Civil War' story arc involving Spider - Man is also great. It explored his moral dilemma of choosing sides between Iron Man and Captain America. Spider - Man's decision - making process and how it affected his relationships made for a very engaging story.
The 'Spectacular Spider - Man: Disassembled' story might be about Spider - Man's world falling apart. His friends could be in danger, his reputation might be under attack, and he has to deal with some sort of conspiracy that aims to destroy his life as a superhero. It could also include the appearance of old foes in new and more menacing forms.
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.
A great idea for a Spectacular Spider - Man fanfic is to introduce a new villain. This villain could be someone with a personal vendetta against Peter Parker, not just Spider - Man. It could be a former classmate who blames Peter for something that happened in the past. You could also write a fanfic about Spider - Man teaming up with other superheroes from the Marvel universe. He could join forces with Daredevil to take on a common enemy in New York. Or perhaps a story where Spider - Man has to deal with the consequences of his actions in a more emotional way, like when he fails to save someone and has to come to terms with that failure.
Peter Parker is definitely one of the most popular. After all, he is the main character in the 'Spectacular Spider - Man'. Fans love to see his further adventures, how he deals with new challenges, and his growth as a superhero.