One possible plot could be that the Demogorgon from Stranger Things somehow finds its way to Fear Street. The Fear Street characters team up with the kids from Stranger Things to fight it. They would have to combine their knowledge of their own worlds' mysteries to defeat this new threat.
Perhaps the Mind Flayer from Stranger Things has a connection to the evil forces in Fear Street. It starts to manipulate events in both locations. The characters from both shows have to figure out this connection and stop the Mind Flayer's plan. This would bring together the psychic powers of Eleven and the knowledge of the Fear Street locals. They might have to travel between Hawkins and Fear Street to gather clues and fight off the minions of the Mind Flayer along the way.
Yes, there are quite a few. You can find them on popular fanfiction websites. Some might focus on crossovers where characters from both universes interact in unique ways, like the teens from Stranger Things facing the horror elements of Fear Street.
Maybe the ending story involves Eleven sacrificing herself to completely destroy the Mind Flayer and all the threats from the Upside Down. Her friends are devastated at first but then realize that she has saved not only Hawkins but the whole world. Years later, they have families of their own and tell their children the amazing story of a girl with superpowers who saved them all.
The plot could involve a new, super - powerful entity that is a combination of the Upside Down's dark forces and a kaiju - like being. This entity starts to wreak havoc in both Godzilla's world and Hawkins. The Stranger Things kids find a way to call Godzilla for help, and Godzilla arrives just in time to face this new threat. As they fight together, they learn about each other's strengths and weaknesses. Eleven uses her powers to enhance Godzilla's attacks, while Godzilla's presence scares off some of the smaller Upside Down creatures, giving the kids a chance to regroup and plan their next move.
One idea could be that the Demogorgon from Stranger Things somehow finds its way into the wizarding world of Harry Potter. The Hogwarts students would be both terrified and intrigued. They might initially try to use magic spells like Stupefy or Protego to fend it off. Hermione would probably be the first to start researching about this strange new creature, while Harry and Ron would be more on the front lines, trying to keep their classmates safe. The Stranger Things kids could also be magically transported to Hogwarts. Dustin would be amazed by all the magical creatures and would want to study them, Eleven might use her powers in new and unexpected ways in the wizarding world, like trying to communicate with magical portraits or using her telekinesis to move magic wands.
Well, in a fanfiction where Mike gets possessed, it could be that the possession is a result of some new Upside - Down experiment gone wrong. The possessed Mike could have new powers that he doesn't understand, like being able to communicate with other dimensions in a way that scares everyone. And his friends would have to find a way to break the possession without harming him, which would involve a lot of trial and error and some deep dives into Hawkins' secrets.
Well, one plot could be that Eleven discovers a new power that only Mike can help her control. It makes them have to spend a lot of time together in secret, away from the others. This creates a really close and intense bond between them as they figure out this new aspect of her abilities.
It's possible that the mystery of the Upside Down is not really about destroying it, but about understanding and co - existing with it. The ending could show the characters finding a way to balance the two worlds. The kids who have grown up throughout the series could become the guardians of this new balance. They might also discover that there are other forces at play that they didn't know about before, and they have to deal with those as well. The relationships between the characters, like Mike and Eleven's love story, could also play a significant role in the ending, maybe they get married and start a new life in a Hawkins that has been changed forever by their experiences.
The plot could involve a mysterious and spooky adventure in a small town with a hidden past and perhaps some supernatural elements.
Well, time travel is a cool theme. Some fanfictions might have the characters going back in time to prevent certain events in the show from happening, like the opening of the gate to the Upside Down. Then there's the theme of alternate universes. Imagine a universe where Eleven was raised by Brenner in a completely different way. And of course, the theme of romance. You can find a lot of fanfictions about Mike and Eleven's relationship, but also other possible pairings among the characters.
Another theme might be self - discovery through love. The characters' love could be so intense that it forces them to face parts of themselves they didn't know. For instance, a character who was always shy and reserved might discover a bold side of themselves because of this 'mad' love in the fanfiction. This could be related to the challenges and growth that often occur in 'Stranger Things' as the characters face the unknown.