Well, usually the 11th doctor dark fanfiction has elements like mysterious and dangerous situations, moral dilemmas, and a departure from the typical heroic image of the doctor. It might also explore deeper psychological aspects of the character.
In a Good Omens Gallifrey Story, perhaps Aziraphale and Crowley could end up on Gallifrey. They might be mistaken for some sort of strange entities by the Time Lords. Aziraphale could be intrigued by the advanced technology and knowledge on Gallifrey, while Crowley might be more interested in causing a bit of chaos among the strict order of the Time Lords.
The main characters are obviously the Doctor and Rose. The Doctor, with his time - traveling abilities and vast knowledge, and Rose, who has her own strength and has grown a lot from her adventures with the Doctor.
Well, the 'Good Omens' and 'Gallifrey' are from different fictional universes. 'Good Omens' is a story full of humor and a unique take on the apocalypse, with an angel and a demon trying to stop it. However, 'Gallifrey' is related to 'Doctor Who', being the home planet of the Time Lords. There's not really a direct 'Good Omens Gallifrey Story' as such. It could potentially be a fan - made crossover idea where the wacky characters from Good Omens interact with the complex time - related concepts and characters from Gallifrey in the Doctor Who universe.
A major theme is the clash and integration of different cultures. The wizarding world in Harry Potter has its own set of values, traditions, and social structures. Gallifrey, as the home of the Time Lords, has an extremely complex and different set of these elements. Fanfictions often explore how characters from each side would interact with and adapt to the other's culture. For instance, how would a Hogwarts student deal with the strict hierarchical society of Gallifrey? And vice versa, how would a Time Lord react to the more fluid social structure at Hogwarts? There's also the theme of heroism. Characters from both universes are often put in situations where they have to use their skills and courage to overcome challenges, whether it's a dark wizard in Harry Potter or some time - related catastrophe in Gallifrey.
One popular 'Time Lady of Gallifrey' fanfiction might be those that explore her origin story. For example, it could detail how she came to be a Time Lady in the first place, her training on Gallifrey, and the early relationships she had with other Time Lords.