The main protagonist in Out of the Silent Planet is Dr. Elwin Ransom. Ransom is a professor at the University of Cambridge where he teaches how to study languages. This is how he is able to learn the language of the Hrossa so quickly. Oyarsa is the main force in the book. He is the ruler over all of Malacandra and the reason why Ransom was brought to Malacandra. Oyarsa wanted to know about earth and its inhabitants; that is the reason why Ransom was brought to Malacandra.
The only antagonists in the book are Dr.Weston and Dick Devine. Weston was able to design and build a spaceship that would take him and eventually others across the stars to other planets. The first planet that he went to was Malacandra where he and his accomplice started collecting gold until the Sorns told