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KOS-MOS is an armored android robot combat weapon with an artificial intelligence designed to fight the Gnosis, developed by the interstellar conglomerate Vector Industries First R&D Division and completed in the year 4767 T.C., created by Kevin Winnicot and administrated by Shion Uzuki.

She is comprised of entirely mechanical parts (possibly from a superior breed of complex nanomachines), a rarity in the age of advanced Realian technology. The basic tenet to which she adheres is based on logic, probability, and completion of her mission above all else. She also unconditionally protects Shion. She is equipped with a "Simulated Personality OS" to aid in communication, and though her speech conveys her role as a robot in service to humans, her tendency to put logic and probability first makes her quite difficult to manage at times. She appears to be emotionless, but throughout the series, evidence indicates that this is not entirely true.

The name 'KOS-MOS' is a recursive acronym used to denote an Anti-Gnosis tactic system. It stands for "Kosmos Obey Strategical Multiple Operation System". Her development name is "KP-X", and she is self classified as a "Special Humanoid Anti-Gnosis Annihilation Weapon". Her serial number is "00-00-00-00-1". Her password is "Ye shall be as gods", which is Genesis 3:5 from the Bible. Her system is NATARAJA, an avatar of Shiva, represented as a dancing figure with many arms. It is of particular interest that this system is named after Shiva, who is also the god of creation and destruction. The system itself was designed by Kevin.

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