One popular theme is Dean and Sam's relationship, exploring their brotherly bond in different situations. For example, there are fanfictions where they face challenges that test their loyalty to each other.
Alternate universes are really popular too. For instance, there are fanfictions where the apocalypse didn't happen as it did in the show, or where the characters have different powers or roles. It's a great way for writers to explore different possibilities within the Supernatural world.
Popular themes in supernatural fanfiction include the exploration of the afterlife. Given the show's heavy focus on the supernatural, many fanfics delve into what happens after death, whether it's heaven, hell or some other realm. The idea of forbidden love is also quite popular. For example, a love story between a human and a supernatural being like an angel or a vampire. Additionally, the theme of power and its corrupting influence is often explored. A character gains a great deal of power and has to struggle not to let it turn them into a villain.
Romance is a huge theme in both 'Supernatural' and 'Lucifer' fanfiction. In 'Supernatural', you often see pairings like Dean and Castiel (Destiel) being explored in fanfictions. In 'Lucifer', there are romances between Lucifer and Chloe. Also, the theme of redemption is popular. Characters like Lucifer trying to redeem themselves or the Winchester brothers dealing with their past actions and finding a way to be redeemed is often written about.
You can try websites like Archive of Our Own (AO3). It has a vast collection of Supernatural fanfictions. Just search for 'Supernatural' in the search bar, and you'll be presented with numerous options.
One popular theme is the comical misadventures of the supernatural characters. For example, if it's about vampires, they might accidentally turn into bats at the most inconvenient times, like during a job interview. Another theme could be the humorous take on the relationships between different supernatural species. Like a werewolf and a witch being roommates and constantly arguing over who gets to use the bathroom first in the morning. And then there's the theme of supernatural beings trying to adapt to the modern human world in a funny way, such as a demon trying to figure out how to use a smartphone.
Another common theme is the revelation of a character's true identity or origin. For example, a character might find out they are part of a long - lost supernatural lineage, which changes their perspective on themselves and their place in the story. This can create a lot of drama and interesting plot twists. Well, in these fanfictions, it's all about uncovering secrets that were previously hidden. And it can be really exciting to read how the characters react to these revelations.
Another theme is Sammy in alternate universes. Fans like to imagine different scenarios for him, like if he had made different choices or if the Supernatural world had different rules. It gives a lot of room for creativity and exploring different sides of his character.
One popular theme is Taehyung having special powers. For example, he might be able to see ghosts or control elements. Another theme could be his role in a supernatural world filled with vampires and werewolves. He could be a protector or a key figure in a prophecy.
One common theme could be the characters' extreme reactions during battles or encounters with grotesque monsters. For example, in some fanfictions, a character might puke after being exposed to a particularly nasty demon's stench. Another theme could be related to the use of puke as a symbol of a character's internal turmoil or fear. In a tense situation, a character's involuntary puking might represent their underlying anxiety.
Another common theme is the angels and demons in the Supernatural universe. Fanfictions might focus on Castiel's journey, his relationships with the Winchesters, or the power struggles among the different celestial beings. For example, stories could be about Castiel trying to redeem himself after making certain choices. It's also popular to see how the various demon characters interact with the hunters and the world at large.
One popular theme could be the exploration of different supernatural powers. For example, characters might discover new ways to use magic or psychic abilities. Another theme could be the relationships between humans and supernatural beings, like a love story between a human and a vampire. And then there's the theme of fighting against evil supernatural forces to protect the world.