The following is a list of Xenosaga characters.
Development
After Xenosaga I, the character models were redesigned for Xenosaga II. MOMO's and Jr.'s designs became "...taller, slimmer and less child-like", which made MOMO appear slightly older. Shion lost her glasses and had a different outfit, while KOS-MOS gained blue highlights in her hair. When the first two episodes of Xenosaga were remade in Xenosaga I+II for the Nintendo DS, they were altered to two-dimensional computer graphics with sprites and visual novel-style dialogue sequences.
Playable characters
Shion Uzuki
KOS-MOS
Ziggy Voiced by (English): Richard Epcar (Episodes II & III)Voiced by (Japanese): Masashi Ebara
As revealed in Xenosaga: Pied Piper, which takes place in T.C. 4667, 100 years prior to the events of Xenosaga Episode I, Jan Sauer was a Captain in the 1875th Special Operations detachment of the Federation Police Bureau. He and his squad were deployed to the planet Abraxas to investigate murders in the U.M.N network committed by an individual known as "Voyager".
During their investigations, he met the widow Sharon Rozas, with whom he fell in love and later married, and her son Joaquin, and learned that Yuriev was providing funding for Voyager's murders. Soon after, Dimitri used his connections within the government to remove Sauer and his team from the investigation, but he continued his investigation even after he and some of his subordinates were arrested.
Following the death of his subordinate Mikhail Ortmann, Sauer discovered that Erich Weber, a member of his team, was Voyager. Erich explained to him his connection with U-DO before he transformed into the Black Testament and killed Sharon and Joaquin before giving him an ultimatum: either he killed him and consumed his soul, or he joined him as a Testament to live forever. However, Sauer refused either option and committed suicide, being reactivated two years later as the cyborg Ziggurat 8. Though he is implied to understand some of the events surrounding the Zohar, his past is generally not explored, except for in Xenosaga I+II, where he reveals more of his past to the party.
In Episode I, the S.O.C.E. sends him to infiltrate a U-TIC organization base and rescue M.O.M.O., who gives him the name Ziggy, and he becomes a father figure to her. After escaping on a spacecraft, the Elsa saves them from being destroyed by the U.M.N. column walls and they meet with the party, with him joining as a support party member. In Cathedral Ship, when Cherenkov diffuses into the Zohar emulator and begins his transformation into a Gnosis, Ziggy states that it is "the same, just like that day.", as Voyager transformed into the Black Testament through the same method. Following the destruction of Proto Merkabah, he helps rescue KOS-MOS after Shion loses hold of her.
In Episode II, Ziggy continues to protect M.O.M.O., even beyond his assigned mission, and bonds with Juli Mizrahi after revealing to her that he committed suicide because of Joaquin's death, as the loss of their children caused painful memories for them. She also asks him to consider life extension, which he does for M.O.M.O.'s sake. However, despite her sympathy for him, most employees of the U.M.N. Control Center regard him as old property. Within Labyrinthos, he sacrifices his cybernetic arm by breaking through a wall to help the party escape from the Ω System. At the end of Episode II, he is to be stationed at the Kukai Foundation and remain on call as a bodyguard for M.O.M.O.
M.O.M.O. Voiced by (English): Sherry Lynn (Episode I), Christina Puccelli (Episodes II & III) Voiced by (Japanese): Rumi Shishido
MOMO Mizrahi (M.O.M.O. being an acronym for Multiple Observative Mimetic Organicus) is a Realian, a class of artificial humans. Specifically, she is a prototype 100-series Observational Realian who Joachim Mizrahi and Juli Mizrahi created using genetic engineering to combat the Gnosis and resurrect U-DO. They created her in the likeness of their deceased daughter, Sakura, and with the appearance and personality of a twelve-year-old girl, and she does not show signs of aging. Despite being capable of thought and emotion, she and Juli had a strained relationship, as she saw her as a reminder of Sakura and nothing more than an artificial human. After Joachim's death, MOMO was rescued from her birthplace during the Miltian Conflict and sent to live with Juli on the planet Fifth Jerusalem, the hub of the Galaxy Federation. She is motivated by a desire to fulfill Joachim's wishes and gain Juli's approval as something more than a replacement for Sakura.
She wields short magical rods in Episode I and an Ether-based composite bow in Episodes II and III. When wielding the rods, she can fight at close range or from a distance by physically attacking enemies or shooting laser beams. When wielding the bow, all of her attacks are long-range. Among her Ether skills is the ability to transform into a more powerful version of herself through a transformation sequence. The costume she wears determines the ether-based abilities she can access for a duration. In Episode III, she gains the ability to immobilize enemies by filling up their "Break meter".
In Episode I, S.O.C.E and Juli assign Ziggy to rescue MOMO from the U-TIC Organization and protect her until her safe return. Throughout the series, she is central to the story because she contains the Y-Data. This makes her the target of kidnappings by Albedo and U-TIC and causes U.M.N. to manipulate her and her friends in order to obtain the Data. When Albedo attempts to extract the Y-Data from her body, which nearly kills her, she attempts to stop him by destroying her mind, but he obtains it after threatening Jr., after which she asks Juli for permission to assist in the investigation of Old Miltia. Following the events at Michtam, MOMO begins working with everyone to rebuild the world, believing that a new network will help to reunite those who have died.
chaos Voiced by (English): Joshua Seth (Episodes II & III)Voiced by (Japanese): Hoshi Soichiro
, also known as Yeshua, joined the crew of the Elsa two years prior to the events of Episode I, tasked with ensuring the safety of the crew during their travels and assisting in tasks such as in-flight functions and transporting cargo. chaos appears to be unaffected by physical aging, as he has the same physical appearance during the main story of Xenosaga as well as during the time of the Miltian Conflict, when he served under the Galaxy Federation fourteen years ago, and in Pied Piper, which takes place one hundred years earlier.
6,000 years ago, when he was known as Yeshua, he was one of the disciples of a man whom Ormus would come to worship as their Lord and Messiah and helped to teach humanity and perform miracles in his place. According to Wilheim and the database, chaos died physically during this time, leaving behind the "Word of Yeshua", also known as Lemegeton, with the Song of Nephilim being an incomplete translation of it. Lemegeton is a wavelength energy that is represented in the material world as words that can only be understood and spoken by chaos (Anima), and. when recited, allows them to access and control the Zohar and access energy from the Higher Domain of U-DO. Although humans are unable to speak these "words", ancient people and future researchers, such as Grimoire Verum, created programs from Lemegeton to control the Zohar. These programs were used in the Relics of God that harnessed the Zohar's energy, such as Zarathustra and Omega. People of the Zohar, whose wills resonated strongly with Anima due to their bloodline, could also control the Zohar, with the strongest being able to communicate with U-DO.
Episode III reveals that chaos is the human incarnation of Anima, a power derived from humanity's collective unconscious that has been present since the beginning of the universe, when certain wills of humanity resonated purely with Anima; according to the database, these were past incarnations of consciousnesses capable of becoming Testaments, including the party members. These wills set off a chain reaction throughout the collective consciousness, resulting in the dispersal of consciousnesses that rejected the collective consciousness and became Gnosis in the real world. Eventually, the dispersal of the collective consciousness would cause the universe to collapse.
To counter this, Anima possessed a failsafe function that would cause the imaginary number domain to collapse if the Gnosis exceeded critical mass, which in turn would cause the collapse of the universe as well as the real number domain and the upper domain. To save chaos' life and prevent destruction, Mary used her power of Animus to seal away the power of Anima into the twelve Anima Vessels by separating his soul into the Anima power, which was divided into the twelve Anima Vessels, and the Will of Anima, which is the failsafe. When separated from his Anima power, chaos' failsafe ability could not activate. However, as long as Anima existed, the consciousnesses would continue to disperse. To prevent this and the destruction of wills, Wilhelm chose eternal recurrence, using Zarathustra to rewind time in an eternal cycle that caused people to live the same lives repeatedly.
At the end of Episode III, chaos rejects the eternal recurrence and trusts the wills of humanity to change the future. Realizing that his power can be used to save the universe with the help of human wills who wish for it, he instructs Shion and her friends to lead humanity back to Lost Jerusalem, which holds the key to saving the universe. After the awakened KOS-MOS restores his power, chaos believes that he will disappear after releasing his power to slow the destruction of the universe and give humanity more time to find Lost Jerusalem. However, his consciousness lives on, as the consciousnesses of the universe desire his existence. After saving the Elsa by holding open an U.M.N. gate to allow them to escape the shockwave of the dimensional shift, he is last seen speaking to KOS-MOS as she drifts through space.
Gaignun Kukai Jr. (Rubedo) Voiced by (English): Brianne Siddall (Episodes II & III)Voiced by (Japanese): Eriko Kawasaki
U.R.T.V. #666 and the leader of the U.R.T.V.'s, Jr., also known as Rubedo, was a survivor of the U.R.T.V. (U-DO Retro Virus) unit that the scientist Dr. Yuriev created to combat U-DO, a mysterious waveform that threatened to destroy the galaxy. He and his twin brother, Albedo, U.R.T.V. #667, were born conjoined twins, with Albedo being attached to him through the heart until they were separated; Gaignun Kukai was the last brother, known as Nigredo. He possesses the unique abilities of the U.R.T.V.'s, including telepathy and telekinetic powers, and is said to have the perfect anti-U-DO wavelength, which is generated when in his "Red Dragon" mode.