Obviously, the new doctor is one of the main characters. There might also be patients who are central to the story, as their cases could be what drives the new doctor's actions and the overall plot. And perhaps there are some colleagues or superiors who interact with the new doctor, either supporting or opposing them.
The main characters in the 'day of the doctor novel' include the Doctor in different incarnations. Each of these Doctors brings their own unique personality and skills to the story. Additionally, there are companions who have been with the Doctor at different times. These companions play important roles in helping the Doctor navigate through the complex situations in the story. There may also be some antagonists or other supporting characters that add to the overall plot.
Both 'dr' and 'doctor' can be used in a novel. 'Dr' is more of an abbreviation and is often used in a more informal or quick way of referring to a doctor character. For example, 'Dr. Smith entered the room.' gives a concise way to introduce the character. However, 'doctor' can be used for a more formal or when you want to emphasize the title in a full form, like 'The doctor examined the patient carefully, his white coat flapping as he moved.'
It depends on the context and the style you want to maintain. 'Dr' is more common in a formal or medical setting, while 'doctor' might be used for a more conversational or descriptive tone.
Perhaps there was a case where Dr Day helped a community. He might have introduced a health program that significantly reduced the prevalence of a certain disease in that area. His efforts in promoting preventive measures and providing accessible treatment options led to this success. He educated the locals on healthy lifestyles and worked with local authorities to ensure proper medical facilities were available.
The common stuff usually involves their ongoing conflicts and the mystery surrounding their bond. Differences can come in the form of alternate universes or different resolutions to their conflicts. Some fanfics might even change their personalities a bit for a fresh take.