Chaos

chaos is a playable character in the Xenosaga series.

Pied Piper
chaos appears in two scenes in Pied Piper and is not named. When Jan has a vision of himself as a child and sees some family members, chaos briefly talks to him, telling him not to chase the shadow as waiting beyond it is the prison of the soul. He says his memories won't give him peace and there are people he must protect. chaos speaks again near the end of the game when Jan and the others confront Erich/Voyager. chaos tells Lactis to protect "Canaan" with all his strength and that Canaan is inside of him.

History
chaos is a mysterious boy on board the Elsa. His past is unknown. He has a good relationship with Matthews and the rest of the Elsa crew and they appear to respect him a great deal.

14 years before the events of the game, during the Miltian conflict, chaos assisted Canaan on a mission to retrieve the U.R.T.V.s. The two of them head down to Miltia on Asher, fighting off U-TIC forces along the way. While there he meets Jin Uzuki and does battle with Margulis along with him. After they split up, chaos and Canaan recover Junior and Nigredo.

Episode I
When the Elsa comes across Shion's escape capsule, KOS-MOS wants to ignore it and immediately head to Second Miltia. chaos appears on the Elsa bridge and wants to rescue them, so they do so. chaos is happy to have more crew members on the Elsa which makes things more lively. When a gnosis appears on the Elsa bridge, chaos displays the power to make it disappear by touching it. He claims he just happens to have this skill and it isn't questioned further. When KOS-MOS sleeps in order to recharge, chaos visits her, being happy to finally meet her and wonders where the real her exists. chaos formally joins the party and helps out Shion and the others fight of U-TIC invaders when Ziggy and MOMO board the ship. chaos remains with the party the rest of the game. When the party travels into the Encephalon to Old Miltia he is paired up with Shion.

Episode II
chaos arrives at Second Miltia along with the others and accompanies Junior, Ziggy and MOMO as they depart the Space Port and fend off Richard and Hermann. Afterwards he heads to Moby Dick's Cafe along with Junior where they meet up with Shion and then Jin. He accompanies Shion and Junior to the Uzuki residence and is able to talk with Jin in private that night. chaos accompanies the others to the U.M.N. Control Center where they plan to analyze the Y-Data inside MOMO, then head into her Subconscious Domain after realizing Albedo has laid a trap for them.

chaos heads to Old Miltia along with the other party members. At the end of the game he recovers Junior from the Space Time Anomaly after he kills Albedo. Speaking with Nephilim, he says this is not the end. After Abel's Ark appears and takes the Zohar, chaos tells Wilhelm, who calls him Yeshua, that he won't hold back anymore.

Lore

 * chaos can survive the vacuum of space without a suit.