Dexter is a fictional serial killer. He is a blood spatter pattern analyst in Miami Police Department.
The fictions is mostly based on his murders. And the relationships between him and some people around him.
Main Characters :
Debra Morgan : Dexter's sister, works as a police officer in the same department.
Rudy Cooper : Dexter's unknown brother, he is a serial killer too.
Harry Morgan : Dexter's father, he is dead. He lives in the delusions of Dexter.
Rita Bennett : Dexter's girlfriend( is going to be his wife in the future ) , mother of two, her childs, Astor and Cody.
Lila Tournay : Dexter's friend, she can see the darkest sides of Dexter's soul. And she wants to be closer to him. And Dexter lets her to get closer.
We don't have to stick to the fiction.