Perhaps he needs the jewels to save someone's life. Maybe a loved one is in danger and the only way to get the ransom or the cure is through the jewels. So, he resorts to stealing them, thinking he can make up for it later.
There might be. Fanfiction is a vast and diverse world. Writers often experiment with different plotlines. But in the mainstream Spider - Man stories, he is a hero who stops crime, not commits it like stealing jewels. So, if there is such a fanfiction, it would be a unique and controversial piece.
The Grinch used his devious plans and disguises to sneak into the town and steal all the Christmas stuff. His motivation was his hatred for the holiday and the joy it brought to others.
Well, one possibility could be that they team up to fight a new super - villain in the city. Maybe this villain has some special powers that require both of their unique skills to defeat.
In fanfiction, perhaps Spider - Man discovers a hidden part of his powers. He might also have to deal with some personal issues at school while fighting bad guys. For example, he could be struggling with a difficult exam while also trying to stop a heist by a group of tech - savvy thieves. And his relationship with his friends could be put to the test as he tries to keep his identity secret from them.
Maybe Peter Parker faces a new and more powerful villain. For example, a super - intelligent criminal who can hack into any technology in New York. Peter has to use his wits and new skills he's developed since the first movie to stop him.
In fanfiction, if Spider Man was experimented on, he might gain new powers. For example, the experiment could enhance his existing spider - like abilities to an extreme level, like being able to swing between buildings at supersonic speeds or having a much stronger spider - sense that can predict events hours in advance.
A 'Spider Man disappear' fanfiction could explore many aspects. For example, Peter Parker's friends and family would be deeply affected. MJ might be heartbroken and start her own investigation. Meanwhile, the scientific community in the story could be looking into the strange phenomenon of his disappearance. There could also be a sub - plot where a young fan of Spider Man decides to take matters into his own hands, inspired by the hero, and tries to find out what happened, even though he has no superpowers. This could show the impact Spider Man had on the city not just as a protector but also as an inspiration.
One reason could be a powerful villain finally getting the upper hand. For instance, if a super - strong and intelligent villain like Doctor Octopus managed to outwit Spider - Man and deliver a fatal blow during a battle.
The plot might involve Spider - Man getting into some trouble in New York and the three Avengers coming to his aid. It could be that a powerful alien artifact has been stolen and Spider - Man accidentally gets blamed for it. The Avengers then step in to help clear his name and find the real culprit while also protecting the city from the potential danger of the artifact.
Maybe in the 2018 fanfiction, the 2023 Spider - Man meeting could be a reunion of all the Spider - Man versions from different universes. They might come together to fight a new and powerful villain that threatens all the universes.