Nurses can be main characters too. They are close to the patients and the doctors, so they get involved in the horror. They might witness strange occurrences, like seeing apparitions in the hallways or having equipment malfunction in a spooky way around them.
One main character could be Dr. Arcane, a powerful mage. Another might be Dr. Sylph, a spirit - like being with special powers. And Dr. Blaze, a warrior with the ability to control fire.
The Doctor is, of course, one of the main characters. He is a time - traveling alien with great intelligence and a sense of adventure.
In 'The Cat in the Hat', the main character is, of course, the Cat in the Hat. He is a mischievous yet fun character who turns a dull day into an adventure for the children.
The main character is of course Dr Black Jack himself. He is a brilliant and mysterious doctor.
Most likely, Dr. King himself is a main character. After all, it's named 'dr king short stories'.
In 'The Cat in the Hat', the main character is the Cat in the Hat, a tall, anthropomorphic cat. There are also the two children, Sally and her brother. In 'How the Grinch Stole Christmas', the main character is the Grinch, a green, furry creature who hates Christmas.
There are often local townspeople who play important roles. They might be witnesses to the ghostly happenings or have some connection to the places where the ghosts are sighted. For example, the old caretaker of the haunted building who has seen strange things over the years.
The main character is Dr Michaela Quinn, of course. Then there's Sully, who has a special relationship with Dr Quinn. There's also the family members like her sister, and the various townspeople who play important roles in the stories.
The main character is of course Dr Thorndyke. He is the brilliant detective at the center of the stories.
In the Dr Faustus novel, Dr Faustus is the main character. He is a man who is eager for more knowledge and power than a normal human can have. Mephistophilis, the agent of the devil, is another important character. He tempts Faustus and is involved in all the deals and interactions. There are also some minor characters like the Good Angel and the Bad Angel which represent Faustus' internal struggle between good and evil.