Yes, there might be such a fanfic. The idea of combining two very popular and distinct characters like Naruto and Spiderman in a fan - created story where Naruto is a fan of Spiderman can lead to some really interesting and creative scenarios. For example, Naruto could be inspired by Spiderman's sense of justice and try to incorporate some of his methods into his own ninja - world - based heroics.
Well, the plot could start with Naruto finding a strange object that transports him into a world where he gets to meet Spiderman. He then becomes a huge fan and wants to learn from him. As he returns to his own world, he brings back some of Spiderman's concepts and tries to apply them in the ninja world, facing both acceptance and resistance from others. He could also use his godlike powers in new and Spiderman - inspired ways.
Another possibility is that some sort of cosmic event makes them both super - charged, Naruto becoming godlike and Spider - Man reaching an ultimate form. They are then chosen to stop an interdimensional threat that could destroy both their worlds. They would have to learn to trust each other quickly and use their combined powers to save the day.
If Naruto has godlike powers, he might be able to enhance Spider - Man's powers too. Maybe he could use some sort of chakra - based magic to make Spider - Man's webs stronger or his senses even sharper. On the other hand, Spider - Man's acrobatic skills could inspire Naruto to develop new combat moves. And their combined powers could create a unique fighting style that would be very effective against powerful foes.
The Green Goblin is a classic choice. His maniacal nature and his flying glider make for some exciting action scenes. Mary Jane could also be included. Her relationship with Spider - Man is an important part of the Spider - Man lore. And don't forget about Aunt May. She can add some heartwarming and sometimes comical family - related moments to the fanfic.
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 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 common theme is probably power and responsibility. Just like in the original Spiderman stories, Peter has to deal with the consequences of having great power. Another theme could be identity. He might struggle with his dual identity as Peter Parker and Spiderman in different ways in the Ultimate version. And friendship is also likely to be a theme, as his relationships with his friends are important parts of his character.
There's 'Midnight Encounters'. This fanfic focuses on the more romantic side of their relationship. It shows how they gradually develop feelings for each other while still maintaining their individual identities as heroes/villains. It's a really sweet read.