Another theme is the discovery of new powers and abilities. When the characters from the two universes meet, they might learn new things about their own powers or discover new abilities altogether. Like a Shadowhunter might learn some unique ways of banishing spirits from the Winchester brothers. This theme of self - discovery through interaction with a different world is quite prevalent.
One popular theme is the crossover between the two universes. Fans like to imagine how the characters from Shadowhunters and Supernatural would interact. Another theme is the exploration of different relationships. For example, romantic relationships between characters that might not be canon in the original shows. Also, there are often themes of adventure and fighting against greater evil, as both shows have elements of that.
Some shadowhunters might be in disbelief at first. They would think it's some kind of trick or dark magic. Others could be excited, seeing it as a chance to peek into their own future. For instance, if a young and ambitious shadowhunter meets their successful future self, they would be eager to learn how they achieved that success.
In Shadowhunters, Clary Fray is often a popular choice. Her journey as a Shadowhunter and her relationships make her an interesting character to write about. In Supernatural, Sam and Dean Winchester are commonly written about. Their brotherly bond and their demon - hunting adventures are rich material for fanfiction writers.
One great 'supernatural shadowhunters crossover fanfiction' is 'The Convergence'. It has an interesting plot where the characters from both universes team up to fight a common enemy. The way the author blends the two worlds' mythologies is really engaging.
One idea could be a crossover where the characters from both universes team up to fight a common supernatural threat that is a combination of demons from Supernatural and Downworlders from Shadowhunters. For example, a powerful demon has made a pact with a group of rogue vampires to take over both the human world and the Shadow World.
Alec from Shadowhunters and Castiel from Supernatural. Alec is a loyal and by - the - rules type of person, while Castiel is an angel who often doesn't fully understand human ways. Their interactions could be really fun as they try to understand each other's motives and goals while fighting side by side.
I really like 'Supernatural React to Their Future'. This fanfic shows the characters reacting to events that are supposed to happen in their future. It's full of suspense and emotion. The way the author portrays the shock and disbelief of the characters is very well - done. It also has some great dialogue that adds to the overall atmosphere of the story.
Fanfiction.net is also a good place. Although it might not have as many as AO3, there are still some great 'Supernatural React' fanfictions there. Browse through the 'Supernatural' category and look for ones with high reviews. Sometimes, the hidden gems are in the less popular ones, so don't be afraid to dig a little deeper.
One of the main themes is the battle between good and evil. The Shadowhunters are constantly fighting demons which represent pure evil. Another theme is love. There are various romantic relationships among the characters that add depth to the story. Also, identity is important. Characters often struggle with their Shadowhunter identity and how it fits into the normal world.