There are torchwood fanfictions that center around relationships. Some might develop the romantic relationship between Jack and Ianto further. They could explore how their relationship progresses in different scenarios, like during a particularly difficult mission or when facing a threat to the entire Torchwood organization. It adds an extra layer of emotional depth to the characters and the overall Torchwood universe.
One interesting torchwood fanfiction could be the ones that explore the backstories of the characters in more depth. For example, a story might focus on Owen's life before joining Torchwood and how his experiences shaped his somewhat cynical personality. Another type could be the alternate universe stories, where the events in the original series take a different turn. Maybe in one, Captain Jack doesn't die as often and how that changes the dynamics of the team.
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.
One idea could be a fanfic where Torchwood has to deal with an alien invasion that targets Earth's power sources. They'd have to use their unique skills and technology to stop it.
One idea could be that they team up to face a new alien threat that is beyond what either of them has faced alone. Maybe an alien that can manipulate time in ways that disrupt the fabric of reality. Another could be a story where the Doctor and the Torchwood team have a clash of ideologies at first regarding how to handle a situation with a lost alien civilization on Earth, but then they learn from each other.
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.
There might be a fanfiction where Rose joins Torchwood on a mission to a parallel universe. In this story, she could bring her perspective from different dimensions and time travels, and together with Torchwood, they have to deal with the differences and similarities between the two universes while facing some common threats.
It could bring together beloved characters from both shows in unexpected ways. Maybe there's a shared adventure that combines their unique skills and storylines.
Romantic relationships between characters from the two shows are also common. Maybe a character from 'glee' falling in love with a character from 'torchwood'. It allows for a lot of character development and exploration of different personalities coming together.
One common theme is the impact on relationships. Her relationship with Rhys becomes even more central as they prepare for parenthood. Another theme is how her pregnancy affects her work at Torchwood. There's often a struggle to balance her duties there with her new - found maternal responsibilities. Also, there can be themes related to the potential of the unborn child having some sort of special ability or connection due to all the alien exposure in Torchwood.
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.
Another popular one is 'Slow Decay'. It explores the darker side of Torchwood and the moral dilemmas the team often faces. The complex characters and the engaging storyline make it a favorite among many Torchwood fans.