Lady Armaroid is Cobra's enduring robotic partner throughout official media. Her origins lie in advanced technology from an ancient lost Martian civilization, establishing her as a premier mechanical cyborg. Initially hidden within the cumbersome robot butler Ben during Cobra's amnesia, her true form emerges alongside his recovered memories, revealing an amber-eyed humanoid female with distinctly artificial skin.

She commands the helm of their spacecraft—the Tortuga in manga, the Turtle in visual adaptations—delivering vital logistical support on missions. Possessing superhuman strength, she typically avoids direct combat and weaponry, concentrating instead on navigation and operational tasks. Her partnership with Cobra rests on profound, unspoken trust, marked by mutual lifesaving in countless perils; this core dynamic persists across all narratives, though some adaptations alter her designation, such as the "Andromeda" English dub.

Her pivotal role in survival is demonstrated during the Sidoh prison confrontation, where she interposes herself to shield Cobra from Crystal Bowie. Her capabilities include operating in extreme environments, exemplified when she rescues Cobra from cryogenic freezing by plunging him into water to reverse the effects. Across every story, she remains Cobra's steadfast ally, her core functions and background unchanged, with no romantic developments beyond exclusively professional loyalty.