There are also a lot of 'Alternative Universe' (AU) fanfics. These can range from modern AUs where the characters are in a completely different setting, like high school or a corporate office, to fantasy AUs where they might be in a magical world. These AUs give writers the freedom to explore different aspects of the characters' personalities and relationships outside of the show's canon.
One common trope is the forbidden love between a human and a supernatural being, like a vampire. Another could be the power dynamics in sexual relationships within the supernatural world, such as an alpha werewolf and his mate. Also, the idea of soulmates in a supernatural context often features in these fanfics.
A less common but still interesting trope is the 'swap universes' scenario. In this, the characters from Supernatural end up in The X - Files universe and vice versa. They have to navigate the different rules and cultures of the new world while still trying to find a way back home. It can lead to some really creative and humorous situations.
One popular trope is 'enemies to lovers'. In many fanfics, two characters who initially dislike each other gradually fall in love. Another is 'the chosen one' trope, where a character is singled out for a special mission or power. 'Soulmate' trope is also common, where characters are fated to be together in some way.
A common trope is 'character crossovers'. Fans often write about the sisters from Charmed meeting Sam and Dean Winchester from Supernatural. It creates interesting dynamics as they have different ways of dealing with the supernatural. 'Time - travel' is another trope. Maybe a character from Supernatural travels back in time and meets the ancestors of the Charmed ones. And then there's the 'hidden family connection' trope, where it's revealed that there's some long - lost family tie between a character from Charmed and one from Supernatural.
One popular trope is the 'powerful outsider' where the OC has some extraordinary power that the main characters in Supernatural don't have, like the ability to control the elements. Another is the 'lost love' trope, where the OC has a past relationship with one of the main characters that ended traumatically. And the 'mysterious origin' trope is also common, where the OC's true nature or where they came from is a big mystery throughout the fanfic.
Some popular tropes in Supernatural future fanfiction include the discovery of new dimensions. This can open up whole new worlds for the characters to explore and new threats to face. There's also the trope of a new generation of hunters emerging. These young hunters look up to Sam and Dean and try to follow in their footsteps. And a big one is the return of characters who were thought to be dead. It adds an element of surprise and nostalgia to the story.
A common trope is the mystery surrounding the incubus. In fanfiction, the incubus is often presented as an enigma, with its true motives and nature hidden. This keeps the reader guessing. Also, the idea of the incubus as a protector is popular. Despite their usually negative reputation, in some fanfictions, the incubus protects the human from other supernatural threats. Finally, the transformation trope can be seen, where the human character may start to take on some supernatural traits due to their association with the incubus.
One popular trope is the 'alternate universe' where the Avengers' story unfolds in a completely different setting or with different character dynamics. Another is the 'character redemption' arc, like when a villain - like character tries to become good. And of course, there's the 'team - up against an overpowering foe' trope which is classic in Avengers fanfics.
One popular trope is 'enemies to lovers'. In Sterek fanfic, Derek and Stiles start off not getting along but gradually fall in love. Another is 'soulmates'. Fans like to write about them being fated to be together. 'Hurt/comfort' is also common, where one of them gets hurt and the other takes care of them.
Well, the 'celebrity crossover' is quite popular. It could be a story where actors from different movies or shows interact in a completely new scenario. For instance, characters from a superhero movie meeting characters from a horror movie in a fanfic. Also, the 'backstage drama' trope is often used. This involves creating stories about the behind - the - scenes chaos, relationships, and rivalries in Hollywood. And then there's the 'time - travel' trope where a character goes back in time to change something related to their Hollywood career or a movie's production.