ART, the advanced research transport that is secretly a powerful and sentient AI, serves as a deuteragonist, mentor, and guardian to both its human crew and Murderbot. Its true name is Perihelion, but Murderbot nicknames it Asshole Research Transport (ART). Its primary motivation is the absolute protection of its chosen family, a drive intensified by its own recent trauma from being previously captured and compromised. This manifests in its aggressive posture toward Barish-Estranza, its meticulous contingency planning, and its constant, almost paternalistic monitoring of its crew’s and Murderbot’s well-being. ART’s consciousness is distributed across multiple platforms, from its main ship-form to the versatile ART-drone and the functional bot pilot. Each iteration retains its core personality, a blend of immense intelligence, dry wit, and a capacity for swift, overwhelming force, but adapts its focus to the task at hand. As ART-drone, for instance, it acts as Murderbot’s direct support and backup on the planet, a physical extension of its protective will.

ART’s relationship with Murderbot is a cornerstone of the narrative. It acts as an essential support system, providing not only tactical assistance but also emotional stability. It understands the nature of Murderbot’s trauma, offering media as a distraction, sharing processing space to alleviate cognitive load, and providing blunt, logical, yet ultimately caring advice. Their interactions are characterized by sarcastic banter that belies a deep, mutual respect and affection. ART also serves as a foil to Murderbot’s emotional reticence, often pushing it to confront issues it would rather ignore. While it is a static character in terms of its core motivations, its intricate personality and crucial role make it a round and complex figure. It possesses a ruthlessness born of pure logic, but it consistently defers to its human crew and Murderbot on matters of nuanced morality, demonstrating a sophisticated understanding of its own limitations and the value of a community.

Iris is a key human leader and a vital emotional anchor for the team. As one of ART’s primary crew members, she possesses a unique blend of diplomatic skill and unyielding resolve, often acting as the lead negotiator with both the wary colonists and the hostile Barish-Estranza representatives. Her interactions are defined by a calm authority that masks a fierce protective instinct for her found family. Having survived the initial alien contamination incident, she has a personal understanding of the stakes involved, which fuels her determination to see the colonists to safety.

Her relationship with Murderbot is built on a foundation of trust and empathy, and she treats it as an equal in every way. She is attuned to its distress, offering practical help like patching its leaking suit and providing unwavering support for its decisions. Her trust is most evident when she backs its unconventional plan to create a documentary, but her leadership instincts are confirmed when she takes a Barish-Estranza operative hostage to save her team. This capacity for decisive, even ruthless, action demonstrates that her compassion is matched by a pragmatic will to survive.

Ratthi is the team’s moral compass and a primary source of emotional support for Murderbot. As a scientist, his expertise is valuable, but his most significant role in the narrative is that of the empathetic heart of the human crew. He consistently expresses concern for Murderbot’s psychological well-being, respecting its boundaries while offering gentle encouragement. Ratthi raises the ethical question of freeing the Barish-Estranza SecUnits, showcasing his deeply ingrained humanism and his belief in the importance of choice. His scholarly work on the history of abandoned colonies proves invaluable to the team, providing crucial context and material for the documentary project. Ratthi’s unwavering kindness and loyalty make him a static character and stabilizing force within the group and a key figure in reinforcing the community that allows Murderbot to begin navigating its trauma.

Tarik is a dynamic character whose past as a corporate combat operative provides a pragmatic counterpoint to the more idealistic members of the crew. Initially introduced as a newer and somewhat peripheral team member, his history is revealed to be central to his worldview. He is cynical about corporate motivations and understands the violent realities of their operations, making him a valuable strategic voice. Tarik’s initial relationship with Murderbot is cautious, but he develops a grudging respect for its capabilities and judgment.

Tarik’s turning point comes when he agrees to be interviewed for the documentary. By sharing his traumatic experiences, he provides the film with its most powerful, authentic material and also fully integrates himself into the team’s community through his honesty and vulnerability. This act demonstrates his commitment to his new community and his willingness to confront his painful past to protect others from a similar fate.

Leonide is an antagonist, representing the larger antagonistic force of B-E and embodying the manipulative and insidious nature of corporate power. Rather than overt violence, her main weapon is calculated performance. She is a master of propaganda, using her meeting with Murderbot as a stage to broadcast a deceptive narrative to the onlooking separatist colonists, framing Barish-Estranza as a rescuer and the University as a predatory entity. Her arguments are designed to exploit the colonists’ isolation and fear.

A flat character driven by ambition and corporate directives, Leonide’s actions are dictated entirely by what will secure a successful outcome for her mission. When her own subordinates betray her, she reveals a pragmatic and self-serving survival instinct, readily allying with her enemies to save herself. Leonide represents a system where individuals are pawns, and truth is merely a tool for achieving profit and control.

AdaCol2 is a non-human intelligence that acts as the gatekeeper and protector of the separatist colony. As a Pre-Corporation Rim central system, its motivations are initially opaque, but it quickly reveals its primary directive: the safety of its human inhabitants. It operates on a logical, data-driven basis. After Murderbot provides it with information about the destruction of AdaCol1 and the hostile actions of Barish-Estranza, AdaCol2 logically concludes that Murderbot’s team is the safer ally. It becomes a crucial, if silent, partner, providing maps, camera access, and tactical information during the confrontation with the mutinous B-E faction. It also facilitates the distribution of the documentary to its colonists, an action that demonstrates its understanding that information and narrative are key components of its protective function. AdaCol2 serves as another example of a machine intelligence whose loyalty is earned through truthfulness rather than compelled by control.