You could try 'Doctor in the Vampire World'. It combines the Doctor Who universe with vampire elements in a unique and engaging way. The story keeps you hooked with its twists and turns.
It often combines the supernatural elements of vampires with the sci-fi world of Doctor Who. There might be unique character interactions and unexpected plot twists.
The vampire OC in such fanfiction could have a vulnerability to certain elements from the Doctor Who universe, like sonic screwdriver frequencies. They might have a complex relationship with the Doctor, sometimes an ally, sometimes a foe. And their appearance could be a blend of classic vampire features with futuristic elements.
In such fanfiction, a vampire companion could be both charming and dangerous. They might have a thirst for adventure and a hidden agenda. Also, their vampire nature could lead to some interesting plot twists and challenges for the Doctor.
A powerful vampire lord could be the main antagonist. This vampire lord might want to use the Doctor's time - traveling abilities for his own dark purposes. Maybe he wants to spread vampirism across different time periods and planets. The Doctor and the vampire companion would have to stop him to prevent chaos in the universe.
The main similarity is that they both inspire fans to create their own stories based on beloved characters and universes. The difference could be in the tone - 'Doctor Who' fanfic can be more adventurous and mind-bending, while 'The Vampire Diaries' fanfic is often more dramatic and emotional.
You could come across adventure stories where Buffy and the Doctor team up to face a common enemy. Or maybe stories that explore what would happen if the Doctor visited Sunnydale. The possibilities are endless!
Often, fanfiction combines the supernatural elements of both shows. There's also a focus on alternate universes and how characters from different shows interact in those settings. Another common aspect is exploring the backstories and hidden depths of the characters.
It's hard to say exactly. But it might cause the Doctor's personality to change or give them new abilities and challenges to overcome. It all depends on the author's imagination!