Some fan fictions focus on alternate universes within the Supernatural world. Picture a universe where Sam and Dean were raised by their mother instead of their father. How would their lives be different? What kind of hunters would they become? These are the kinds of stories that can be found in supernatural fan fiction.
There are those fan fictions that explore the backstories of the demons in Supernatural more in - depth. For example, a story could be centered around a demon who was once a human with a tragic past and how that past still affects their actions as a demon, even when they are opposing the Winchesters.
Another idea is to focus on the relationships. In 10x5, there were some tensions between the characters. A fan fiction could expand on that. Say, Dean is angry at Sam for something that happened. The story could explore how they work through their differences and come out stronger as a team, or it could take a darker turn and have them split up for a while, each facing their own challenges alone.
Another storyline could be that Chuck is not as all - knowing as he seemed. Fan fictions sometimes explore the idea that there are things beyond his control or knowledge in the Supernatural universe. He then has to rely on Sam and Dean's instincts and skills more than he expected, leading to a more equal partnership in their adventures.
One great 'Supernatural' fan fiction could be one that focuses on an alternate universe where Sam and Dean are hunters in a steampunk world. It could explore how they use old - fashioned, steam - powered gadgets to hunt monsters.
One popular 'Supernatural' fan fiction is about Dean and Sam having a new type of adventure in an alternate universe. Another might be centered around their relationship with Castiel in a more domestic setting. There are also those that explore their backstories in greater depth, like how they coped with their early years hunting alone.
There could be bjxmas supernatural fan fictions that involve the Winchester brothers dealing with a supernatural Christmas entity. Maybe a demon or an angel with a special mission during the holiday season. In these stories, we might see how they use their usual hunting skills but also have to adapt to the Christmas - themed challenges.
One idea could be exploring an alternate universe where the main characters have different powers. For example, Sam could have the power of teleportation instead of his usual abilities. Another idea is to focus on a backstory for a minor character, like how Bobby Singer got started in the hunting business. It could also be interesting to write a story where the Winchesters team up with a group of new hunters from a different part of the world and they all have to work together to defeat a powerful demon.
The mystery around the character. Carver Edlund in Supernatural has an air of mystery, and fan fiction can explore his backstory in ways the show might not have fully delved into. Writers can create their own theories and expand on his character, which is really fascinating.
One interesting Yogscast fan fiction could be about the characters going on an epic adventure in a new, uncharted world within the Minecraft universe they often play in. Maybe they encounter strange new mobs and have to use their combined skills to survive.
One interesting Snagrid fan fiction could be about their adventures in a magical forest. They might encounter strange creatures and have to use their combined skills to get out. Another could be a story where they solve a mystery in Hogwarts that no one else could figure out.
One interesting story could be about a group of survivors who form an unlikely alliance in the post - apocalyptic world of DayZ. They start off as strangers but come to rely on each other's skills to fend off zombies and other hostile players.