Harshaw is a cantankerous lawyer and writer with libertarian views, who becomes a protector and advisor to Smith, offering wisdom and philosophical insights throughout the story.

Gillian is a compassionate nurse who helps Smith escape from the hospital, forming a deep bond with him and joining him in his journey and the exploration of radical ideas.

Caxton is a determined journalist and Gillian's romantic partner, seeking to expose truths in a world of powerful political machinations and often finding himself embroiled in controversy.

Patricia is a tattooed carnival performer who quickly bonds with Smith and becomes an integral part of his circle, embracing his ideas and playing a significant role in his spiritual community.

These three are Harshaw's capable secretaries, managing his affairs with intelligence and skill, demonstrating independence and resilience despite his old-fashioned attitudes.

Douglas is the politically savvy Secretary General of the global Federation government, balancing public perceptions and political maneuvering while interacting with the novel’s protagonists.

Duke is Harshaw’s technician, responsible for maintaining the electronics on Harshaw’s estate, and eventually becomes more open-minded about Smith’s Martian background and ideas.