A great 'Stranger Things' react fanfiction idea is the characters reacting to different fashion trends over the years. Eleven might be really intrigued by the punk fashion of the 80s with all the spikes and leather. The gang could also have a good laugh at some of the more out - there fashion trends from the 90s and 2000s.
One interesting story could be about a character's reaction to the Upside Down opening up in their neighborhood. For example, Dustin might be really excited at first, thinking it's a new scientific discovery, but then quickly realizes the danger. Another could be Eleven's reaction when she first experiences a normal teenage party. It's fascinating to see how she'd handle the loud music, dancing, and social interactions.
The younger characters like Lucas and Max might get really excited about the fanfiction. They could see it as an extension of their own adventures. They might start imagining themselves in the scenarios written by the fans. It could also inspire them to think about their own actions in different ways, like if a fanfiction shows them facing a new type of danger in the Upside Down, it could make them feel more brave and ready for future challenges in their real story.
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.
One idea could be that the Demogorgon from Stranger Things somehow ends up in Derry from It. The Losers' Club and the kids from Hawkins could team up to fight it. They would have to combine their different skills and knowledge of the supernatural.
One idea could be that the Losers' Club from 'It' somehow ends up in Hawkins, Indiana, during the events of 'Stranger Things'. They could team up with the kids from 'Stranger Things' to fight a new, combined threat that has elements of both the Upside Down monsters and Pennywise's terrors. For example, the Mind Flayer could merge with Pennywise in some way, creating an even more terrifying entity.
One idea could be a crossover where the ninjas from Naruto enter the Upside Down in Stranger Things. They use their jutsu to fight the strange creatures there. Another could be characters from Stranger Things learning chakra control in the Naruto universe. Maybe Eleven could use her powers in combination with Naruto's Rasengan.
One idea could be that Naruto characters are transported to the Upside Down in Stranger Things. They use their ninja skills to fight the strange creatures there. For example, Naruto could use his Rasengan against the Demogorgon.
You could have an OC that is a transfer student from a different town where strange things have also been happening. This OC could have some knowledge about the otherworldly events that the kids in Hawkins haven't encountered yet. Or make an OC who is a scientist's assistant, secretly helping the main characters by providing inside information from the lab. They might also be in danger because of this connection to the scientific side of the mystery.
One interesting aspect is the exploration of character relationships. For example, if a main character gets pregnant, it can show how their friends and family in the 'Stranger Things' world react. It can bring out new sides of characters like their protectiveness or their insecurities.
I think Dustin is really interesting to write about. His love for science and his quirky personality can lead to some really fun storylines. He could be involved in some new scientific discovery in Hawkins that's related to the Upside Down. Joyce Byers is also a great character to write about. Her determination to find her son in the first season and her overall strength as a mother can be the focus. And then there's Billy. His complex and often troubled character can be explored, like what made him the way he is and if he could be redeemed in fanfiction.