Maybe a plot where Spider - Man has to face a new villain who has the power to manipulate time. This would make for some really interesting battles and strategic thinking on Spider - Man's part. He would have to find a way to defeat the villain without getting caught in the time - warping chaos. Also, a story about Spider - Man traveling to an alternate dimension where his powers work differently could be cool.
A great plot could be Spider - Man getting trapped in a virtual reality world created by a tech - savvy villain. In this world, he has to fight his way through various digital obstacles and enemies that are based on his past foes. Meanwhile, his friends in the real world are trying to find a way to break him out. This would allow for some exploration of how Spider - Man's mind and powers interact with a digital environment.
How about a crossover with the Hulk? Spiderman might be on a mission in a city when the Hulk goes on a rampage. Instead of fighting the Hulk directly, Spiderman has to figure out a way to calm him down or lead him away from the populated areas. Along the way, they could encounter some other villains who are trying to take advantage of the situation, and then they end up teaming up to defeat the villains.
An OC in 'ultimate spiderman oc fanfiction' could be a mutant with the power to control plants. They could use their powers to help Spider - Man fight villains in a more environmental - friendly way. For example, they could create giant vines to trap villains or use plants to detect the presence of danger. Another plot idea is an OC who is a master of disguise. This OC could infiltrate the criminal underworld to gather information for Spider - Man, leading to some tense undercover operations. Or an OC who has the power of super - speed and teams up with Spider - Man to take on enemies that are too fast for Spider - Man to handle alone.
One idea could be a story where Spiderman has to team up with his greatest enemies to fight a new, more powerful threat from outer space. This would force him to put aside his differences and find common ground with the likes of Doctor Octopus and Green Goblin.
One idea could be that the chubby Spiderman has a hard time swinging between buildings due to his extra weight, so he has to come up with new ways to move around the city. Maybe he invents some sort of web - enhanced jetpack. Another plot could involve him being bullied because of his appearance, but then he uses his intelligence and superpowers to prove his worth. For example, he could solve a big scientific mystery that even the smartest minds in the city couldn't crack.
One interesting aspect could be the unique interpretations of Spider - Man's character. Fanfics often explore different sides of well - known characters. In this case, it might show a more personal or emotional side of Spider - Man that we don't see in the official comics or movies.
One idea could be that Spiderman gets transported to the DC universe due to a multiverse glitch. He teams up with Batman to stop a villain who has stolen technology from both universes. Another could be that Peter Parker goes to Metropolis for a science fair and accidentally gets involved in a battle between Superman and Lex Luthor, using his Spidey - sense and skills to help Superman.
Maybe in this fanfic, there's a multiverse crisis that causes parts of New York in the Marvel universe to merge with Gotham in the DC universe. Spiderman and Superman meet and initially have a bit of a misunderstanding due to their different ways of handling things. But then they realize they need to work together to separate the two cities again. Spiderman could use his webs to help Superman contain some of the chaos while Superman uses his strength to move large structures that are in the way.
One idea could be that Spider - Man tries to form his own group of heroes who are neutral in the Civil War. They could be a sort of mediator between Captain America and Iron Man's sides. For example, he recruits some lesser - known heroes like Daredevil or Jessica Jones.
One plot idea could be that Spiderman and Mantis team up to fight a new villain in the city. Mantis uses her empathic abilities to sense the villain's motives, while Spiderman uses his webs and strength to physically combat the foe. Another could be a story where they get accidentally transported to an alternate dimension and have to work together to find their way back home. They might face strange new enemies and allies in this dimension.
Another plot could involve a mad scientist who creates a device that can drain the powers of superheroes. He first targets Superman, but Spiderman gets involved when he sees the chaos in Metropolis. As they try to stop the scientist, they discover that the device has a side effect of giving the heroes new, unexpected powers for a short time. They have to quickly learn to control these new powers while also dealing with the main threat.