A youthful and beautiful noblewoman originally from the country of ESFI. After crossing into the Blazing World, her natural leadership and intelligence lead her to become its absolute ruler. She possesses a deep curiosity for science, philosophy, and religion, actively engaging with her subjects, including diverse groups like bear-men and bird-men, to learn about and shape her new dominion. She orders the construction of chapels made of star-stone and fire-stone to establish a unified religion and continually seeks out new knowledge.

A writer and intellectual from England, acting as a fictionalized version of author Margaret Cavendish. She is ambitious, rational, and desires to rule her own world, eventually creating intricate philosophical societies in her imagination after rejecting various earthly traditions. She frequently offers political, military, and artistic advice to the Blazing World's rulers, functioning as a trusted advisor and intimate confidante.

The absolute monarch of the Blazing World and a member of the perpetually youthful Imperial Race. He presides over a peaceful, unified utopian society populated by various animal-men and centered in the golden, jewel-encrusted city of Paradise. He willingly shares his power, granting his new wife complete control over the realm while unconditionally supporting her intellectual explorations and military goals.

An English nobleman and loyalist who lost the majority of his estate during a civil war. He is a wise, honest, and noble patron of the arts and sciences. He serves as an idealized husband whose virtues are aggressively defended in the Blazing World's courts by allegorical figures like Prudence and Honesty, reflecting his steadfast morality.

The ruler of ESFI, a divided and war-torn country on the Empress's home planet. His political power is limited by a slow-moving council, leaving him vulnerable to attacking fleets and domestic strife until he receives outside military intervention. He serves as an example of a ruler who requires centralized power to bring peace to his people.

A sailor from the country of ESFI who falls obsessively in love with a wealthy Lady. Driven by unrequited feelings, he commits abduction, an action that incurs the wrath of the gods and sets the entire narrative in motion by driving his ship to the freezing North Pole.

Incorporeal entities possessing extensive knowledge of the universe, history, and religion. They require a physical medium, such as air, to move and communicate with others. They guide the Empress in her philosophical inquiries, discussing the nature of God and the cosmos, but they strictly refuse to participate in violence or answer forbidden theological questions about original sin.

A personified allegorical figure representing luck and fate. Fickle and stubborn, she views rational, risk-averse individuals as enemies and is blamed for the destruction of the Duke's earthly estates during the civil war.