One idea could be that Naruto gets bitten by a radioactive spider instead of Peter Parker. So he has to balance his ninja training with his newfound spider - like abilities. He might use his chakra to enhance his spider - sense or web - slinging skills.
Maybe Spiderman somehow gets transported to the Naruto universe. He has to learn about chakra and ninjutsu while still using his own powers. He could team up with Naruto to fight against a common enemy like Orochimaru who is interested in his spider - powers.
Well, perhaps in the fanfiction, Spiderman gets transported to the Naruto universe. He has to learn how to use chakra and ninjutsu with Naruto as his teacher. They could go on missions together and Spiderman's web - slinging abilities could be combined with Naruto's Rasengan for some really cool combat moves against common enemies in the Naruto world.
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 a Spiderman and Iron Man crossover. Spiderman could team up with Iron Man to fight a new, powerful villain. Maybe they have to combine their tech and skills, like Spiderman using his web - slinging abilities along with Iron Man's high - tech gadgets to take on an enemy who can manipulate electricity.
Another interesting concept is that the ponies from MLP gain superpowers similar to Spider - Man. For example, Rainbow Dash could have the ability to swing from clouds like Spider - Man swings from buildings. They could then fight a common enemy that threatens both their worlds, and Spider - Man has to teach them how to use their new powers effectively.
One idea could be a spiderman fanfic where he teams up with a lemon - themed superhero. Maybe they fight a villain who is causing chaos in the city's fruit markets. It would be a fun and unique take on the spiderman universe.
One idea could be a story where Spider - Man gets transported to the Pokemon world. He could use his web - slinging abilities to traverse the various terrains and help Pokemon trainers in need. Maybe he teams up with a Pikachu and they use their combined powers to defeat a powerful villain who is trying to disrupt the balance in the Pokemon world.
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.
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 idea could be that Spiderman and Supergirl team up to stop a powerful alien threat that has arrived on Earth. The alien has the ability to manipulate gravity, which causes chaos in cities. Spiderman uses his web - slinging skills and quick thinking to rescue civilians while Supergirl uses her super strength and flight to take on the alien directly.
One idea could be a story where Ant Man and Spiderman team up to stop a new villain who has the ability to shrink and control insects on a large scale. They'd have to combine their unique skills, with Spiderman using his webs to swing around and Ant Man shrinking to get into small places the villain might be hiding.