One great piece of 'Supernatural' and 'Torchwood' crossover fanfiction is 'The Convergence'. It weaves together the two universes really well, with the characters from both shows interacting in a very believable way. The story has a great plot that involves a common threat that both the Winchester brothers from 'Supernatural' and the Torchwood team need to face. It's full of action and also some really interesting character moments.
There's also 'Torchwood Meets Sherlock'. This fanfic imagines a scenario where the Torchwood team has to deal with a mystery that Sherlock Holmes might typically handle. It's really cool how they blend the different styles of the two shows, with Torchwood's sci - fi elements and Sherlock's detective work. The character dialogues are very well - written.
One common theme is the clash of different kinds of supernatural or otherworldly elements. Since 'Supernatural' has a lot of demons, angels, and ghosts, and 'Torchwood' deals with aliens and time - space anomalies, when they cross over, there's often a struggle to understand and combat these different threats. For example, in many fanfics, the characters have to figure out how to fight an alien - possessed demon or something similar.
A third option could be 'Supernatural in Sunnydale'. This fanfiction is interesting as it shows how the Winchesters would handle the unique brand of evil in Sunnydale. It also delves into the relationships between the characters. For example, how Dean might interact with Spike, a complex vampire character from 'Btvs'. The story is well - written and has a good mix of humor and horror.
One great piece is 'The Devil's Alliance'. It combines the dark allure of Lucifer from 'Lucifer' with the spooky world of 'Supernatural' in an interesting way. The characters' interactions are well - written and it keeps you on the edge of your seat.
One idea could be that the characters from Torchwood and Arrow team up to fight a common enemy that has some sort of interdimensional powers. Maybe a villain from Arrow's world has found a way to access Torchwood's technology and is using it for evil, and the two groups have to combine their skills to stop it.
Yes, there are likely some interesting ones. You can start by looking on fanfiction websites. Some might explore unique character interactions, like how the characters from Torchwood would interact with the immortals in Highlander. They could create new and exciting storylines that combine the two universes' mythologies.
Character consistency is a key element. The characters from Torchwood should act in a way that is true to their original personalities. For example, Captain Jack Harkness should be flirty and fearless as he is in the show.
Another interesting one is 'Owen and the Unseen Threat'. In this fanfiction, Owen has to face a new, mysterious threat all by himself while the rest of the team is preoccupied. It shows his resourcefulness and determination, and the author does a great job of creating suspense throughout the story.
One great Supernatural Castiel crossover fanfiction is 'Castiel in the World of Harry Potter'. It has an interesting plot where Castiel finds himself in Hogwarts and has to deal with the magical world while still being an angel. It's really exciting to see how he interacts with the characters there.
One great 'supernatural charmed crossover fanfiction' is 'The Crossover Chronicles'. It combines the dark and spooky elements of 'Supernatural' with the witchy world of 'Charmed' in a really interesting way. The characters from both shows interact in a believable manner, like Sam and Dean meeting the Charmed sisters and working together to fight a common supernatural threat.