Companions, though not in the traditional sense like in other Doctor Who stories, may also appear in the form of those who side with the War Doctor or those he encounters during his travels through the war - torn universes. Their brief but impactful appearances help to shape the War Doctor's journey and give us different perspectives on the events of the Time War.
There are also often other Time Lords and various alien species involved. The Time Lords play an important role as they are at the center of the Time War. Some of the alien species are either the enemies in the war or the victims caught in the crossfire. Their interactions with the War Doctor add depth to the stories. For instance, there might be a species that the War Doctor tries to protect from the Time War's destruction, which shows his compassionate side even in the midst of all the chaos.
Often, the main characters are the doctors themselves. They could be military doctors like those in the British Army during the Falklands War.
Maybe there are some military commanders in the stories as well. They can influence the situation of the war doctors, for example, in terms of providing resources or making decisions about the location of the medical facilities. Their actions can either help or hinder the work of the war doctors.
In 'the good doctor stories', there could be main characters like a surgeon who is known for his steady hands and fearless approach in the operating room. There may also be a general practitioner who is really good at diagnosing rare diseases. And then there could be a young intern who is full of enthusiasm and eager to learn from the more experienced doctors.
The Doctor is obviously one of the main characters. He's the time - traveling hero who gets into all sorts of adventures.
Doctor Blake is obviously one of the main characters. He is the central figure around which the stories revolve. He's intelligent and curious, always eager to solve the mysteries related to the ghosts.
I'm not sure as I haven't read the book specifically, but probably the doctor of horror is one of the main characters.
Well, Doctor Strange himself is the main character in these stories. He is a complex character, a former surgeon turned sorcerer. The Ancient One is also important. She is Strange's mentor, guiding him in the ways of magic. Wong, as Strange's friend and fellow sorcerer, often plays a key role too. He helps Strange in many battles and is a source of knowledge about the mystic arts.
The pilots who control the War Robots can also be main characters. Their skills, strategies and personalities play important roles in the stories. For example, a brave and innovative pilot might lead his War Robot to victory in a difficult battle. Some pilots might be more cautious while others are more aggressive, and these traits can greatly influence the outcome of the stories.
The soldiers are often main characters. Both the American soldiers and the Vietnamese soldiers had their own stories, their fears, and their hopes.
I'm not sure specifically who the main characters are without more context. But they could be soldiers, commanders, or civilians caught in the middle of the war.