Well, in some fanfictions, the Queen of Hell might be involved in a love triangle with a main character from Supernatural and another supernatural being. This could lead to all sorts of drama and conflict, as her power and influence would surely disrupt the normal relationships in the story. Also, there could be a plot where she tries to rewrite the rules of Hell, causing chaos both in Hell and on Earth.
One interesting storyline could be about the benders facing a new and powerful supernatural entity that challenges their abilities in unexpected ways. For example, they might encounter a spirit that can manipulate time, causing chaos in their world.
One interesting storyline could be a Nephilim trying to hide its true identity from both angels and demons while living among humans. It would face the struggle of controlling its powers and not being discovered.
One interesting storyline could be about an alternate version of Sam and Dean where they are vampires instead of hunters. It would completely flip their roles and moral compasses.
One interesting 'Knight of Hell' fanfiction story could be about a Knight of Hell who decides to rebel against their dark nature. They might start helping the Winchesters secretly, adding a new layer of mystery and intrigue to the Supernatural world.
In some Hell House supernatural fanfiction, there might be a plot where a young, inexperienced medium is lured to the Hell House. The house tries to use the medium's power to break free from some ancient curse or seal. As the medium discovers the true horror of the house, they must fight against its influence and find a way to escape while also learning more about their own powers.
In some fanfictions, the Queen of Hell is portrayed as a complex character with a tragic past. Maybe she was once an innocent soul who was wronged and turned into a demon, and her rise to the throne of Hell was a journey of revenge. This type of portrayal makes her more sympathetic and adds depth to the character. Also, there are portrayals where she is a master strategist, always one step ahead of the heroes in the story.
Well, in some Supernatural paralyzed fanfiction, there might be a story where a beloved character is paralyzed as a result of a spell gone wrong. Their friends in the Supernatural world might search for rare ingredients to create a cure. It could also involve the character having to adapt to their new state and still contribute to the fight against evil in some way, like using their knowledge of the occult to guide the others even while being paralyzed.
In some fanfictions, there might be a situation where the Flash's speed force is somehow connected to the supernatural world in Supernatural. Maybe it attracts the attention of angels or demons who want to use it for their own purposes. This could lead to a complex plot where the Flash has to deal with both his own villains and the otherworldly beings from Supernatural.
In this type of fanfiction, the character development can be really fascinating. Since it's not bound by the show's exact plotline, the author can take a character like Castiel and develop him in unexpected ways. He could face moral dilemmas that are more extreme or form alliances that we wouldn't see in the original show. This allows for a deeper exploration of the characters' personalities and what makes them tick.
One interesting storyline could be Dean's daughter inheriting his hunting skills. She might start small, like helping out with local hauntings in her town while keeping it a secret from her non - hunting friends. Another could be her trying to find out more about her mother, who could be someone Dean had a brief encounter with during his travels. Maybe she discovers she has some unique powers that neither Dean nor Sam have, which leads to a whole new adventure in the Supernatural world.