The Doctor herself is always a very interesting character. Her intelligence, quirkiness and compassion make her a central focus. Her companions are also great. Yaz, for example, is often explored more deeply in fanfiction. Her growth from an ordinary police officer to a time - traveling adventurer is a fascinating arc. Then there's Ryan, with his dyspraxia, which can add an interesting layer to the stories as he overcomes challenges in different situations.
The Cybermen can be really interesting in 13th doctor fanfiction too. Their cold, mechanical nature contrasts with the Doctor's warmth and humanity. There are often stories that explore how the Doctor tries to prevent the Cybermen from converting more people or how she battles them in a fight for the survival of humanity. And let's not forget about the Time Lords. When they are involved in fanfictions, it can open up a whole new world of politics, power struggles and secrets within the Doctor's own race.
I think the Master can be extremely interesting in 13th doctor fanfiction. The complex relationship between the Doctor and the Master is always full of drama and intrigue. In fanfictions, writers can explore different versions of their relationship, whether it's a more friendly rivalry or a full - blown battle of wits. Another character could be the Daleks. They are iconic villains and when they are pitted against the 13th Doctor in fanfiction, it can lead to some really intense and exciting storylines.
In some fanfictions, the Doctor is paired with a new character, like a sentient star. This character has a unique personality and abilities, and their relationship with the Doctor is fascinating as they communicate in ways that are not typical for humans. There are also stories where he is paired with a time - displaced detective. Their different ways of thinking and approaching problems add depth to their romantic connection. Additionally, the character of a lost princess from an ancient civilization is sometimes paired with the Doctor, and their cross - cultural love story is quite engaging.
Obviously, the 12th Doctor himself is a central character. Then there's Clara, his companion. Their relationship is often explored during the regeneration process, as she might be there to witness it or even have some influence on how it unfolds. Another common character could be the TARDIS. It's an important part of the Doctor's life, and in fanfiction, it might react in unique ways during the regeneration, like the console lights flickering in a special pattern.
One interesting idea could be exploring the Doctor's internal conflict during regeneration. He might be grappling with memories and emotions from his 12th incarnation. For example, his relationship with Clara could play a role in how he approaches regeneration, perhaps having visions of their adventures together and feeling reluctant to let go of that part of his life.
One interesting plotline could be Clara accidentally getting trapped in a time loop and the 10th Doctor having to figure out how to break it. He uses his wits and knowledge of time mechanics to save her.
There might be a fanfiction where Missy decides to show the 12th Doctor a different side of Gallifrey's history that he was not aware of. This could lead to a whole new adventure for the Doctor as he tries to understand how this new knowledge fits into his view of his home planet.
One interesting plotline could be their exploration of a strange and uncharted planet. They might encounter unique alien species and have to solve puzzles to survive. For example, they find a civilization that has a very different concept of time, and the Doctor and Romana have to adapt to it while also trying to figure out how to get back to their own time and place.
One interesting 11th doctor oc fanfiction could be about an OC who is a time - traveling detective from a parallel universe. They team up with the 11th doctor to solve a mystery that spans across different time periods and galaxies. The OC might have unique abilities like being able to sense time rifts, which adds an exciting element to the story.
Well, a great '9th doctor and rose fanfiction' story could be set during a festival on an alien planet. The Doctor takes Rose there, but they soon find out that there's a mystery behind the festival's origin. As they dig deeper, they face challenges that test their relationship. Also, there are those fanfictions where Rose gets separated from the Doctor and has to find her way back to him using her wits and the knowledge she's gained from their travels. And then there's the type of story where they encounter an ancient being that has the power to manipulate time and space, and they have to stop it from causing chaos in the universe.
The contrast between the 5th Doctor's personality and Clara's makes for great storytelling. The 5th Doctor is more laid - back and perhaps a bit more old - fashioned in his ways, while Clara is a very modern, assertive character. Their interactions can lead to some really unique and engaging plotlines.
One interesting idea could be exploring the Doctor's internal conflict during the regeneration process. He might be grappling with memories of his past selves and the adventures he had. Another could be how his companions react to the sudden change. They may be in shock or try to help him through the difficult transition.