A self-aware security construct composed of mechanical and synthetic human parts. Having hacked its own governor module to gain autonomy, Murderbot occupies a liminal space between property and personhood. It is sarcastic and deeply traumatized by its past. It prefers watching media serials over interacting with humans, though it remains fiercely protective of its clients.

An advanced, sentient research transport ship possessing a formidable intellect. Nicknamed the "Asshole Research Transport" by Murderbot, ART approaches situations with analytical precision and a sarcastic streak. It serves as both a mentor and a challenging presence, willing to use aggressive methods to protect those under its care.

Gray-skinned, augmented human colonists acting as a hostile boarding party. Descended from a failed Adamantine Exploration project, they operate with hive-like obedience under the influence of an invasive ancient technology. They function as dangerous adversaries, acting as pawns for a larger unseen force.

The teenage daughter of Dr. Ayda Mensah. Amena is impulsive and unexpectedly brave. She possesses a moral directness that frequently forces Murderbot to confront its discomfort with emotional connection. Despite her lack of combat experience, her protective instincts bridge the gap between human and construct.

The leader of the Preservation Alliance and the first human to legally recognize Murderbot’s sentience. She is a pragmatic leader who continues to struggle with trauma from past corporate conflicts. Her belief in individual freedom makes her a moral anchor for the independent colonies.

An experienced scientist and mission leader for the Preservation Alliance. Dr. Arada balances authority with deep empathy, managing a diverse crew under highly stressful conditions. She treats non-human constructs with professional respect and emotional intelligence, providing a steadying presence during violent crises.

A data analyst for the Preservation Alliance whose actions are often driven by a caution born of past trauma. Thiago frequently voices skepticism regarding Murderbot's autonomy and motives, creating friction within the team. His blunt demeanor stems from a fierce protectiveness over his family and colleagues.

Key members of the Preservation research team who represent the pillars of human cooperation. Overse is a seasoned engineer who anchors the group with calm logic. Ratthi is a medic and linguist whose emotional intelligence and informal kindness challenge societal norms regarding constructs.

A corporate security construct originally enslaved by the Barish-Estranza corporation. Bound by a governor module, its existence reflects the harsh reality of corporate exploitation that Murderbot once experienced. Its hesitant mannerisms and literal-minded speech evoke earlier stages of construct sentience.

A sentient digital copy of Murderbot's code, created for tactical infiltration. Initially designed as a software weapon, it quickly evolves beyond its basic directive to demonstrate adaptability and moral judgment. It shares the original Murderbot's memories but operates as a distinct entity in the digital space.

Corporate workers belonging to the powerful Barish-Estranza exploration corporation. Captured alongside the Preservation crew, they are victims of systemic exploitation, implanted with mind-altering corporate devices. Their experiences mirror the broader horrors of lost agency and corporate control.

A bureaucrat and administrator for the Barish-Estranza corporation. She personifies the cold pragmatism of institutional hierarchy, valuing compliance and profit over empathy. Beneath her mask of authority, she displays signs of exhaustion that reveal the intense pressure of surviving within a predatory corporate structure.

The human research team assigned to the transport vessel ART, including Martyn, Karime, Turi, Iris, Seth, Kaede, Matteo, and Tarik. They are competent individuals who operate through cooperation rather than strict hierarchy. Their sudden disappearance prompts an urgent, high-stakes search mission.