The main characters in "The Running Man" are:
* Ben Richards: The protagonist, a former astronaut who is framed for a crime and forced to participate in the deadly game show "The Running Man" to survive.
* K.B.: Ben's former colleague and friend who helps him escape from prison and go on the run.
* The Host: The charismatic and ruthless host of "The Running Man" who orchestrates the deadly games.
* The Hunters: The various "stalkers" who pursue Ben on the show, each with their own unique skills and motivations.
* Amber: A young woman who helps Ben with his escape and later joins him in his fight against the show.
It's important to note that there is also a 1987 film adaptation of the novel called "The Running Man" starring Arnold Schwarzenegger. The characters and story in the film are different from the book, but they share the same basic concept.