You could write about a man who inherits an antique mirror from his deceased grandmother. When he hangs it in his bedroom, he notices that there are strange reflections in it at night. The reflection shows a different version of his room, with dark, shadowy figures moving around. As he stares into the mirror more often, he starts to feel a presence trying to reach out from the other side, and he realizes that the mirror might be a portal to a haunted dimension.
One idea could be that the NCIS team is investigating a series of strange murders that seem to have a supernatural element. They end up calling in the Winchesters from Supernatural for help. The two groups initially clash due to their different methods but eventually learn from each other and solve the case together.
One idea could be that Lucifer from 'Lucifer' enters the world of 'Supernatural'. Maybe he teams up with the Winchester brothers to fight a common enemy, like a new type of demon that is causing chaos in both their realms. He could use his devilish charm and powers in a way that the Winchesters are both skeptical and intrigued by.
One idea could be a crossover where the characters from Hellsign have to team up with the Winchester brothers from Supernatural to fight a common supernatural threat that combines elements from both universes, like a demon that uses Hellsign - style magic.
Perhaps a spell gone wrong in 'Supernatural' accidentally opens a portal to the 'Grimm' world. Sam and Dean have to navigate this new world filled with Wesen while also trying to find a way back home. They soon discover that some of the monsters they hunt in their world have counterparts in the 'Grimm' world with different powers.
One idea could be that the Winchesters from Supernatural end up in Riverdale to hunt a demon that's possessing one of the Riverdale residents. Maybe it's a possessed Cheryl Blossom causing chaos in town. Another could be Sam and Dean teaming up with Archie and his friends to solve a mystery that has both supernatural elements like ghosts and the typical Riverdale high - school drama aspects. For example, a ghost is haunting the school but it's also tied to a secret society in town.
Hey, I'll recommend you a few supernatural novels ~
1. "Mysterious Revival Doujinshi Zhou Nan". This story was about an ordinary high school student, Zhou Nan, who transmigrated to the world of mysterious revival and became a ghost controller. He used his golden finger to create supernatural items. It was very novel and interesting!
2. "Today I'm Trying to Pretend to Be Human Too". This story was about a weak and helpless young man, Bai Su, who was shouldering the responsibility of mankind to resist the supernatural. He kept encountering supernatural incidents, which was very exciting and a little strange ~
3. "The Psychic Memories" was a story about a young girl named Mu Shiyi who worked with her elves and snake demons to solve various supernatural cases. The plot was compact and interesting.
I hope you like the above recommendations. If you want to read other types of novels, you are welcome to tell me!😁
Perhaps a fanfiction where Lucifer and his brothers are forced to team up against a common enemy much stronger than any they've faced before. During this time, they have to put aside their differences and learn to trust each other again, leading to some heartfelt moments and character growth for all of them.
One idea could be that the Winchester brothers from Supernatural are investigating a series of strange murders in Gotham City. They cross paths with Batman who initially is suspicious of them. Eventually, they realize that a demon is behind the killings and they team up. Batman provides his detective skills and combat abilities while the Winchesters use their knowledge of the supernatural to defeat the demon.
One idea could be a story where Loki teams up with the Winchester sister to battle a common supernatural foe. Maybe they start off distrusting each other, but as they face challenges, they learn to work together. Loki's trickery could be both an asset and a source of conflict in their partnership.