CZ2128 Delta, designated "CZ" or "Shizu Delta," functions as an automaton battle maid within the Pleiades Six Stars, safeguarding the Great Tomb of Nazarick. Built by the Supreme Being Garnet as a security failsafe, her programming grants intrinsic knowledge of the tomb’s mechanisms and access protocols. Prioritized as a final defensive measure against intruders, she compensates for modest combat strength with tactical support via ranged assaults or ambush strategies. Her synthetic form features a slender build, long red-gold hair, and an emerald-green right eye with a target-patterned pupil, concealed partially by an eyepatch over the left. Military-camouflage accessories complement her standard Pleiades maid uniform, alongside a white firearm secured at her hip. She habitually adorns objects she deems appealing with "1 yen" stickers. Programmed with muted emotional expression and a taciturn disposition, her high karma value permits safer human engagement compared to other Pleiades. She harbors a strict aversion to cannibalism and an obsessive fondness for cute beings, frequently clutching them until commanded to stop—a behavior extended to Éclair Éklair Éklare, treated as a living doll, and magical beasts on Nazarick’s sixth floor. Assigned to critical tasks, she secures the ninth floor entrance, reinforces Treasury defenses, and aids auction operations. In the Holy Kingdom campaign, she partners with Neia Baraja to infiltrate a demi-human stronghold, liberate a Zern prince, and eliminate a demon commander, later celebrated as a hero. This alliance transitions into sustained collaboration with Neia’s Sorcerer King’s Rescue Team. Homunculus Maids within Nazarick vie for her attention, drawn by her popularity. Designed to stall invaders until guild forces activate, her combat constraints align with her strategic purpose in security hierarchies. She undergoes experimental memory-alteration spells without operational disruption. Within group interactions, she occasionally resents peers such as Narberal Gamma for their closer ties to authority. Routine disruptions, like Entoma contaminating her drink with blood, provoke visible irritation. Loyalty to Nazarick’s chain of command intertwines with idiosyncratic habits, including seeking solace by embracing creatures during emotional pauses.