One common theme is the eternal struggle between good and evil. The Doctor represents good and the Master represents evil, and their fanfics often explore this dynamic. Another is the idea of redemption. Sometimes the Master is shown to have a chance at redemption through his interactions with the Doctor.
A theme that often appears is the idea of destiny. Are the doctor and the master fated to be enemies? Fanfics may play with this idea, showing that perhaps their destinies are intertwined in a more complex way than just being adversaries. There's also the theme of friendship or a strange kind of kinship that exists beneath their enmity, which is explored in many 'doctor x master fanfic' stories.
Another theme is redemption. Some fanfictions explore the possibility of the master changing his ways and finding a new purpose, often with the doctor's help or influence. It's about the master breaking free from his evil tendencies. In these stories, the doctor serves as a sort of moral compass for the master. This can be seen in stories where the master starts to question his actions after spending time with the doctor.
One common theme could be friendship. They might be portrayed as friends who support each other through difficult times. Another theme could be loyalty, showing how they stay true to each other despite differences.
A prevalent theme is the exploration of the unknown. The fem doctor may be used to her own world of medicine and science, while the master might be from a different realm. Together, they face things neither of them fully understand. Also, redemption can be a theme. Maybe the master has done some wrong in the past, and the fem doctor becomes a catalyst for his change. And of course, there's the theme of personal growth. Both characters grow as individuals as a result of their relationship.
One common theme is the eternal struggle between good and evil. The Thirteenth Doctor represents good, while the Master is often the face of evil. Their interactions are full of this push - and - pull dynamic.
One common theme is adventure. They often go on exciting journeys through time and space together. Another theme is the power of their friendship, how they support and rely on each other.
In 'doctor x patient reader fanfic', a frequent theme is the journey of recovery. This can be the patient's recovery from an illness or injury, but also their journey towards self - discovery and personal growth. Another common theme is the role of compassion. The doctor is usually portrayed as a very compassionate figure, and this compassion is what helps the patient feel better. There's also the theme of secrecy in some cases, as the relationship between the doctor and patient may be seen as inappropriate by some, so they have to keep it a secret at first. This adds an element of drama and tension to the story.
Love and friendship are also prevalent themes. Some fanfics might develop a romantic relationship between them, while others focus on their strong friendship. They are often portrayed as having a special bond that goes beyond the typical soldier - AI relationship. In addition, adventure and fighting together against the Covenant is another theme. They are in the middle of a war in the Halo universe, and fanfics might detail their battles side by side, with Cortana providing crucial support to Master Chief.
One common theme is loyalty. Given their military background in the Halo universe, loyalty to each other and their comrades is often explored. Another is sacrifice. They are both characters who are willing to put themselves in harm's way, and this is often a big part of the stories.
One common theme could be friendship development. Since they are two different characters, exploring how they become friends or allies is a popular choice.