The character of Alexei himself is very interesting. His unique personality and his role in the Stranger Things story make fanfics about him appealing. Writers can explore his untold stories and what - if scenarios.
One great Alexei fan fiction could be one that focuses on his backstory in Russia before coming to Hawkins. It might explore his life as a scientist there, his relationships with other Russian colleagues, and how he got involved in the Upside - Down related experiments.
Alexei was a character who appeared in Stranger Things and had a significant role in the plot. He was involved in some key events and interactions with the main characters.
Sure. One popular Alexei 'Stranger Things' fanfic is 'Alexei's New World'. It explores what could have happened if Alexei had survived and integrated more into the Hawkins community. Another one is 'Alexei's Secrets', which delves deeper into his backstory before coming to Hawkins.
Fanfiction.net is also a good place. There are many 'Stranger Things' fan fictions there. Although the site's interface might not be as modern as AO3, it still has a lot of content. Browse through the 'Stranger Things' category and look for Alexei - centric stories.
One great 'Stranger Things 4 Fanfic' is 'The Upside - Down Revisited'. It delves deeper into the Upside Down and how the characters interact with the new threats there. It has really good character development, especially for Eleven. Another one is 'Hawkins' New Horrors' which focuses on the town's reaction to the events of season 4 and how the community bands together or falls apart. There's also 'Beyond the Gate', which explores what might be on the other side of the gates that keep opening up in Hawkins.
There's also 'Byers Brothers' Adventure'. This fanfic follows Will and Jonathan Byers on a side adventure that wasn't shown in the show. It has great character development and a really engaging plot.
I would recommend 'Hawkins' Hidden Love'. This fanfic delves deep into the lives of the Stranger Things characters in a gay context. The author does a wonderful job of creating a believable story line. It has a great balance between the mystery and drama elements that are so characteristic of Stranger Things, and the exploration of the gay relationships among the characters. It's definitely worth checking out.
In Stranger Things crossover fanfics, Dustin is quite popular. His intelligence and his love for science can lead to interesting interactions in crossovers, for example, in a crossover with a scientific - based fictional world. Max Mayfield is also a favorite. Her skateboarding skills and feisty personality can add a lot to crossovers. And then there's Will Byers. His connection to the Upside Down can be explored in many different crossovers, such as in a crossover with a horror - themed universe.
A Stranger Things crossover fanfic with the Avengers would be really exciting. The Hawkins kids could team up with the Avengers to fight off the Demogorgon which has somehow become a threat to the entire world. Or a crossover with Doctor Who. The Doctor could land in Hawkins and help the gang deal with the Upside Down, bringing his unique time - traveling and alien - fighting skills. Also, a crossover with the Ghostbusters would be fun. They could come to Hawkins to deal with the strange entities from the Upside Down using their proton packs.