Pilot of the Rocinante and former MCRN officer. A Martian with a warm, garrulous personality that masks genuine melancholy about his failed family life. One of the finest pilots in human space, with an instinctive feel for orbital mechanics and ship handling.

Mechanic and general muscle aboard the Rocinante. A man who grew up in the worst conditions Baltimore had to offer and emerged without the capacity for moral judgment most people take for granted - he outsources that function to people he trusts. Straightforwardly violent when necessary, and deeply loyal to those he considers his people.

Former XO of the ice freighter Canterbury who becomes captain of the salvaged Martian gunship Rocinante after witnessing the destruction of his ship. A relentless idealist with a compulsion to broadcast the truth regardless of the political consequences, Holden repeatedly finds himself at the centre of events that define the course of human history.

Chief engineer and executive officer of the Rocinante. A Belter of exceptional intelligence and technical skill who carries a painful past involving the Free Navy. The moral conscience of the crew, she is also one of the most capable engineers in the solar system.

A high-ranking Martian military officer with a long-term strategic vision. A calculating and patient leader who positions himself to shape humanity's future beyond the Sol system.

Laconian admiral and military commander. Takes effective control of the Laconian empire after High Consul Duarte becomes incapacitated, struggling to hold the empire together.

Martian marine gunnery sergeant who witnesses something on Ganymede that her government wants buried. One of the most physically formidable characters in the series, she is also one of its most principled - a soldier who cannot stop asking whether the orders she follows are worth following.

A Belter who rises from security chief at Tycho Station to captain of her own ship to president of the Transport Union. Pragmatic, loyal, and capable of enormous violence when the situation calls for it. One of the series' most consistent moral anchors in the later books.

UN Deputy Undersecretary of Executive Administration and one of the most powerful politicians on Earth. Foul-mouthed, brilliant, and utterly clear-eyed about how power works. She plays the long game better than almost anyone in the solar system and genuinely cares about the billions of people whose lives depend on her getting it right.

Daughter of the magnate Jules-Pierre Mao, who frames Holden for a terrorist attack in a misguided attempt to restore her family's honour. After her imprisonment she joins the Rocinante crew, carrying significant guilt and a body modified for violence she is trying to leave behind.

A scientist who travels to Ilus as part of a Royal Charter Energy survey team and becomes caught in the colony conflict. In the later books she becomes the Laconian Empire's leading expert on the alien gates and the entity that destroyed their builders - a role that places her at the centre of the series' most fundamental questions.

A geologist and scientist who joins the expedition to Ilus (New Terra). Good-humoured and easygoing, he provides a grounding presence among the research team studying the alien world.

Former UN Marine colonel who became the most wanted man in the Belt after Anderson Station, and then - through a long process of reckoning with what he had done - became the most important non-Belter leader in the OPA. A man trying to build something better out of the wreckage of his own history.

The son of pilot Alex Kamal. A young man navigating his own path in a changed solar system, shaped by but distinct from his father's legacy.

A brilliant and amoral scientist formerly employed by Protogen. His expertise in protomolecule research makes him a valuable asset to whoever controls him, though his ethical boundaries are virtually nonexistent.

Belter captain and leader of the underground resistance against Laconia. Former Transport Union operative who coordinates rebel operations across multiple systems.

Daughter of High Consul Winston Duarte, raised in the Laconian palace as the heir to an interstellar empire. Her friendship with a local boy and a strange alien-modified dog begin to pull her away from everything she has been taught to believe.

A young girl who was modified by the alien repair drones on Laconia. Along with her brother Xan, she possesses unusual abilities and knowledge connected to the alien technology.

Underground resistance contact on Auberon who provides safe harbour for Naomi. Helps coordinate local resistance activities.

A boy on Laconia who befriends Teresa Duarte. One of the few people close to Teresa's age that she interacts with.