KOS-MOS

Created for the Xenosaga series by Monolith Soft, KOS-MOS was conceived by Tetsuya Takahashi. According to his wife and Xenosaga writer Soraya Saga, due to how they often depicted human characters in their works as "strong will in a fragile flesh and blood", KOS-MOS was meant to be the opposite, "the delicate pieces of soul in an unbreakable vessel". While she acknowledge she was unable to show the character's story fully within the games, she stated "I think it must be left veiled for now." When writing the game, religious themes were added due to Saga's "deep interest in the power of belief people have".^[1] Meanwhile the name KOS-MOS in part came from Takahashi's thoughts on Nietzsche's philosophy regarding the "will of power".^[5]

Her design was created by artists Kouichi Mugitani and Kunihiko Tanaka.^[2] Several of their designs went unused, however Mugitani would later recycle some of them for his own doujin work.^[1] Prior to Mugitani's involvement, the development team had tried to create her design "in-house". However, Takahashi was unsatisfied with the submitted work. When Mugitani was hired to create the mecha designs for the game, Takahashi asked him to also create a "robo girl in a bondage-type outfit". In Takahashi's eyes, while normally he would stand by his convictions, he instead felt KOS-MOS "should swing whichever way the wind was blowing" and wanted to aim for an extreme, even providing Mugatani with pictures of one of his favorite pornographic film actresses.^[6][7] While Mugatani designed her body, her head and face were designed by Tanaka. Tanaka, who was an artist for the Xenosaga project as a whole, not only created her face and headgear, but finalized the design as a whole.^[8][2] Upon seeing the earliest draft, Takahashi felt they have achieved the design he was after, particularly with the abdominal muscles he had given her.^[7]

Other influences for KOS-MOS' design, particularly her "Archetype" body, came from artist Hans Bellmer's doll creations, an artistic direction Takahashi wanted to maintain through her various iterations. Each iteration of KOS-MOS took into account criticisms towards the previous designs. Takahashi noted that while the "Ver. 4.0" design of her character is considered the most popular with fans, he himself felt it was the farthest away from the concept he had envisioned, as human influences had started to manifest in her appearance. Though he acknowledged it was created by the design team's consensus, he felt she was too "human-like", stating "A vessel is a vessel and shouldn't mean anything more than that, you shouldn't be fooled into thinking it's anything more than that."^[7] Mugatani on the other hand appreciated the artistic opportunities her mechanical design afforded, stating "For those of us who find the inner workings of the female body stimulating, KOS-MOS is a porn star [...] She shows us a beautiful structure of the human body in a different way from the grotesque, with a cool look on her face."^[9]

KOS-MOS's appearance in Xenoblade Chronicles 2 was designed by Tanaka. He wanted to keep the design similar to the original "Ver.1" appearance of the character, and something that would represent "Xenosaga" in the game as a whole. One significant change they did from previous versions of KOS-MOS was to have her main laser attack come from her visor instead of her chest at Takahashi's suggestion, and he added temporary "cat ears" to the sides of it to act as heat sinks. Originally he had considered giving her a "dress" of shorts around her shoulders and hips for a "Gravity Drive" attack, taking inspiration from magical girl anime Pretty Cure, but the development team felt it was excessive and he agreed. The finalized design was named "KOS-MOS Re:", as Tanaka intended it to be a refrain of Mugitani's work on the character.^[6]

KOS-MOS is an armored female android developed by the interstellar conglomerate, Vector Industries. She is made entirely of mechanical parts and nanomachines.^[10] She is programmed based on the tenets of logic, probability, and the completion of her assigned mission. However, threats to the physical safety of her co-creator, Shion Uzuki, cause KOS-MOS to temporarily ignore these parameters. She is equipped with a "Simulated Personality OS" to aid in communication, although she appears incapable of emotion.

KOS-MOS has significant powers believed to be superior to all other party members. In addition to superhuman strength and speed, the nanomachines her body is formed from allow her to morph parts of her body (specifically her arms) into various energy projectile and melee weapons. Her body is also able to self-repair and is very durable though not indestructible, and she is also protected by a force shield. She also possesses the ability to summon weapons such as the F-GSHOT chainguns and her famous F-SCYTHE and equipment from another location via U.M.N. transport. She also has a long-range sensory array, the D.S.S.S. system, and CPU that exceeds even those possessed by Observational Realians. She also possesses a Hilbert Effect projector whose power is thousands of times greater than that achieved by even the largest spaceships.

KOS-MOS possesses several black box components left behind by Kevin Winnicot. Each of these black box features is found in each of her skeletons, Version 1, Version 2, Version 3 and Version 4. One of these is her potent X-BUSTER weapon, a powerful burst of energy beams from her abdomen that absorbs the Gnosis. Others are related to her "simulated personality" OS and her self-awareness. KOS-MOS also has some form of energy manipulation tied to the Zohar. KOS-MOS has another weapon system called the "Tertiary Weapon System", which is seen periodically throughout the series. They consist of a set of energy wings, a pair of energy cannons and other attachments meant to be fitted onto her. While she is programmed to protect Vector personnel unconditionally, her highest priority is to protect Shion specifically.^[10]

An almost human alternate persona tends to come out from time to time in the form of a blue-eyed KOS-MOS. This blue-eyed KOS-MOS is far more powerful than red-eyed KOS-MOS and talks in a more empathetic human-sounding voice. This alternate KOS-MOS is in fact KOS-MOS' true personality that partially awakens at times when Shion is in extreme danger.

KOS-MOS is one of many playable characters in the 2005 tactical role-playing game Namco × Capcom, along with M.O.M.O. and Shion also from Xenosaga.^[11] In 2008, she appeared as one of playable characters in the role-playing game Super Robot Taisen OG Saga: Endless Frontier.^[12][13] That same year, KOS-MOS made a cameo appearance in the role-playing game Tales of Hearts, where she is one of many supporting attack characters for the player.^[14] In 2010, she appeared as a playable character in Super Robot Taisen OG Saga: Endless Frontier Exceed. In 2012, she appeared as a playable character in the tactical role-playing game Project X Zone,^[15] as well as the 2015 sequel.^[16]