|“|| I am happy... to be of service.
|“|| I know that i failed to protect you back then. But this time, I will. I am leaving the rest to you now! Shion!
- KOS-MOS, before using a phase transfer cannon on a gnosis
KOS-MOS is an armored gynoid, developed by the interstellar conglomerate Vector Industries. 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 Uzuki, her co-creator. She is equipped with a "Simulated Personality OS" to aid in communication, and though her speech conveys her role as an gynoid in service to humans, her tendency to put logic and probability first makes her quite difficult to manage at times.
The name 'KOS-MOS' is a recursive acronym used to denote an anti-Gnosis tactic system. It stands for "Kosmos Obey Strategical Multiple Operation Systems". 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". She appears to be emotionless, but throughout the series, evidence indicates that this is not entirely true.