Project X Zone Wiki

Original Appearance:

Xenosaga Episode 1: Der Wille Zur Macht (2002)

Platform of Origin:

PlayStation 2

Unit Type:

Solo (Namco X Capcom)
Pair (PXZ/PXZ2)


T-elos (Project X Zone)
Fiora (Project X Zone 2)

Cross appearances:

Namco x Capcom
Project X Zone
Project X Zone 2

Voice Actor:

Mariko Suzuki

First Chapter Appearance:

Prologue 1 (NxC)
Chapter 19 (PXZ)
Chapter 6 (PXZ2)

"Acknowledged. Preparing to remove all hostiles in the vicinty."

KOS-MOS (コスモス/KOS-MOS Kosumosu?) is from the Xenosaga series. An android designed for combat against the Gnosis, mysterious beings bent on destroying humanity. Created by Vector Industries, she comes equipped with a variety of weapons and a generator which activates the Hilbert Effect used to draw the Gnosis out of their dimensional flux and into normal space.


Episode 1: KOS-MOS was created by Shion Uzuki and Kevin Winnicot of Vector Industries. During the process, the KOS-MOS Archetype went berserk and killed Kevin. Eventually she was completed, but was activated when the ship they were on, the Woglinde, was attacked by Gnosis. During the escape, one of the lieutenants on the ship, Vergil, was shot by her. After the ship was destroyed, their escape pod was eventually rescued by the Elsa scavenger ship.

They encountered the Gnosis Ship "Cathedral", and during their exploration, KOS-MOS started acting strangely. During their escaped, the party gets rescued by the Durandal, the Elsa's debtor, and their leader Jr.. But on arrival, they were framed for the Woglinde's destruction. To prove their innocence to the Galaxy Federation, they dived into KOS-MOS's memory banks to access the black box that contains the data using the Encephalon. The group responsible for framing them, U-TIC, sends Jr.'s brother Albedo to capture MOMO.

He activates the Song of Nephilim, which summoned countless Gnosis. MOMO was kidnapped during the confusion, and the party heads into the Song and finds Albedo and MOMO. Enraged, Jr. and the others fought against Blue Testament and deactivated the Sound. Before departing, Albedo activates the Proto Merkabah and destroys the federation fleet, then set his sights on Second Miltia. The party heads inside and devise a plan to destroy the station by jettisoning all its compartments, making it explode in the process. They find Albedo in the reactor core, but escapes after turning the reactor into a Gnosis. KOS-MOS managed to protect the Elsa during the re-entry by transforming herself as they escape.

Episode 2: As soon as the party lands on Second Miltia, Shion, Allen and KOS-MOS head for Vecor Industris' Second Branch in order to construct KOS-MOS's Ver. 2 Armor Frame and Tertiary Weapon System. She arrives in time to save Shion from Voyager. While infiltrating Labyrinthos, U-TIC's headquarters, they encounter two of Febronia's sisters Cecily and Cathe who were safeguarding the original Zohar. KOS-MOS tried to stop U-DO by destroying them, but it was in vain: The Patriarch summons Proto Omega, and it fuses with the Zohar and becomes a weapon that can strike anywhere in space. But as they enter the Omega System, they find the Testaments defeating the Patriarch and revive Albedo. Jr. heads into the anamoly he creates and decides to personally stop him. Albedo is defeated and the Zohar is floating in deep space, but before they can retrieve it they witness a stunning sight: Abel's Ark, a Gnosis the size of a planet, takes the Zohar and vanishes.

Episode 3: Vector Industries decides to cancel the KOS-MOS Project in favor of the T-Weapon Program (the project resposible for creating T-elos). After being used in a live-fire exhibition, KOS-MOS was dumped in a trash compactor but she was re-activated by Shion. She continued travelling with them until they encountered T-elos at Rennes-la-Chateau. KOS-MOS was overwhelmed and defeated, and after extensive analysis, she was unable to be repaired. This changes however, when Shion obtains the original designs of KOS-MOS from a past Kevin Winnicot (though still unknown to her) while going undercover as a U-TIC employee. With the help of Erde Kaiser's technology, KOS-MOS was rebuilt into her current Ver. 4 form.

She had gained more power than her previous forms, but it was later revealed that KOS-MOS was actually supposed to be a prototype for T-elos used for the resurrection of Mary Magdalene. On Michtam, the group makes their way to Zarathustra when encouter T-elos again. The battle seemed evenly matched due to KOS-MOS' upgrade, but then she deflect's T-elos' shots with one hand, which she couldn't do in thier last fight. She then shatters the globe on T-elos' head after stunning her with her own Phase Transfer Cannon, shutting her down.

Wilhelm tries to convince KOS-MOS to activate Zarathustra, but instead destroys the key and defeats it along with Shion and the others. As Zarathustra goes out of control, KOS-MOS says her final goodbyes to her true love Shion and stays behind to protect Chaos and Nephilim while they summon the spirits of the Gnosis in order to return to the "Land of Origin" also known as Earth. While she manages to rout most of the incoming Gnosis, a Cathedral-Type Gnosis appears from behind the pair. To protect them she sacrifices herself by using her Phase Transfer Cannon and creates an enormous explosion.

Crosspedia Entry[]

An anti-Gnosis battle android created by the massive interstellar conglomerate Vector Industries. In order to make communication with her more smooth, she is installed with an imitation personality OS. Although she speaks in a mechanical voice and should not have a heart, on rare occasions she can be moved by emotions in the same way as a human girl, and changes to speaking with an elegant and gentle tone. She has progressed through a series of bodies, from the test type Ver.1, to the combat type Ver.2, to the upgraded Ver.3. After a fierce batlte with T-elos she was rebuilt into her current Ver.4.

Other Appearances[]

She appears in Namco x Capcom in her Ver. 1 form along with Reiji Arisu, Xiaomu, Shion and MOMO. She can be "recreated" in Soul Calibur III's "Create A Soul" mode by outfitting a fighter with Type X parts. She appears as a playable character in Super Robot Wars OG Saga: Endless Frontier in her Ver. 4 form alongside Haken Browning, Kaguya Nanbu, Reiji and Xiaomu while T-elos appears as a boss character. They also appear in the sequel Endless Frontier EXCEED (along with MOMO). Her outfit can be downloaded as a costume for Judith in the PS3 release of Tales of Vesperia. She also appears as a support character in Tales of Hearts.


KOS-MOS uses her various weapons to fight, including her X-Buster, D-Tooth, and Valkyrie gun. She is partnered with her nemesis T-elos in Chapter 19: Thus Spake Eternity. In Project X Zone 2, she is partnered with Fiora from Xenoblade Chronicles and first appears with her in Chapter 6: You Will Know Our Names.

Stats at Level 50 (Project X Zone)[]

50 13377 359 377 136 141

Stats at Level 99 (Project X Zone 2)[]

99 51449 803 415 263 257

Project X Zone 2 Ultimate Equipment[]

Gear: Dystopia (ATK +333, TEC +20, DEX +20)

Accessory: Secret White Underwear (ATK +20, DEF +219, TEC +30, DEX +30, SP +50)

Attack List[]

Project X Zone Attack List[]

Name Strength XP Rate Effect
Cannon & Valkyrie C 6% Critical+
X-Buster & S-Sault A 3% Down
D-Tooth & Echidna B 7% None
Ice Crest & T-Skylla A 3% Stun
Storm Waltz C 9% None
Special: D & U-Teneritas S 100% Cost Stun
MA: Spell Blade (2-4 enemies) B 100% Cost


Support: X-Buster & T-Skylla C None Stun

Project X Zone 2 Attack List[]

Name Strength Effect
Valkyrie II & Shutdown A None
Cyber Kick & Cross Impact C Stun
Freeze Shock & Cannon Drones C Stun
X-Buster & Mag Storm B Down
Floral Tempest & Monado Buster A None
Special: D-Teneritas & Sword Drones X S None
MA: X-Buster & Final Cross S None
Support: Lunar Blade A None

Skill List[]

Project X Zone Skill List[]

Skill Name XP Cost Target Effect Description
Boost 15% Self Speed x2 Fast combat footwork
Break Cure 10% Ally Heal all ailments Heals status ailments
Platinum Singer 25% Self Defense +15% Protective fashion that boosts defense
Heartbreaker 20% Self Nullify Enemy Block & Fixed Enemy Launch Height Multi-Ability
Charge Auto (50% Chance when XP under 50%) Self XP increase 10% KOS-MOS Only

Project X Zone 2 Skills[]

Name SP Cost Target Effect Description
Boost 70 Self Move +1 KOS-MOS boosts her speed to move more quickly in battle.
Battle Start Affinity 50 N/A XP Recovery +30 Fiora's close bonds with her allies boosts her tension at the start of the battle.
Encourage 70 Other SP Recovery +50% Fiora cheers her allies on, lending them her fighting spirit.
Break 30 Self Disables Cross Break KOS-MOS knocks foe down in the middle of a combo.

Project X Zone 2 Auto Skills[]

Name CP Cost Activation Rate Effect Description
Charge 0 Start of Turn: 100% Charge Bonus Damage +15% KOS-MOS charges up power to strengthen the force of the next attack.
Guard Shift 0 After Action: HP 50% or less Defense +10% Fiora unleashes her defensive aura to guard attacks and cut damage.
Chain Attack 300 Start of Turn: XP 100 or more Join Counterattacks Fiora helps allies counter with a highly damaging combo strike.
Choke 400 After Action: XP 100 or more Back Attack +25% KOS-MOS's friend Ziggy taught her this rear choke attack.
Burst Affinity 500 After Action: more active allies than enemies Extends CRT Window Fiora never misses a chance to attack alongside her allies.
Mary's Heart 600 Start of Turn: SP 30% or less SP Recovery +20% KOS-MOS's alternate personality can summon a variety of benevolent miracles.
Meyneth's Soul 700 Start of Turn: 50% HP Recovery 30% The goddess within Fiora unleashes a healing light.


Her theme is "The Battle of Your Soul" from Xenosaga Episode III. In Project X Zone 2, her theme is She's Coming Back from the same title.


List of Quotes - KOS-MOS & T-elos

List of Quotes - KOS-MOS & Fiora

List of Quotes - KOS-MOS (Story/PXZ)

List of Quotes - KOS-MOS (Story/PXZ2)



  • KOS-MOS's appearance in the first Endless Frontier game explicitly takes place in the small window of time between her being rebuilt into her Ver. 4 body and its official activation in Xenosaga Episode III. It is unknown if her subsequent appearances take place in the same time period.
  • KOS-MOS is the only character not original to the Cross-series to appear in every single game Reiji and Xiaomu have.
    • KOS-MOS and T-elos appear in the two Endless Frontier games.
  • KOS-MOS, Shion, and MOMO are the first characters to join the party in Namco X Capcom and are the only ones to do so in a prologue chapter.
    • They're also the only ones in the game to debut in a series that released in the 21st century.
  • KOS-MOS, MOMO, X, Zero, the Servbots, Alisa B., and (Technically) Mecha-Fiora are the only mechanical playable units in the Cross series.
  • KOS-MOs, Hotsuma, Heihachi, and Armor King are the only playable units with canonical deaths.
  • KOS-MOS, Jin, Heihachi, and Alisa A. are the only characters whose design changes in another entry.
  • KOS-MOS, Jin, Heihachi, and Valkyrie are the only Namco characters to appear in all three crossover entries.
Namco x Capcom
Playable Characters
Armor King - Arthur - Baby Head - Bravoman - Bruce - Cammy - Captain - Chun-Li - Demitri - Felicia - Fong Ling - Gil - Ginzu - Guntz - Guy - Haggar - Heihachi - Hideo - Hiromi - Hsien-Ko - Jin - Judas - Kagekiyo - Karin - Ken - Ki - King - Klonoa - KOS-MOS - Kurino - Kyoko - Lilith - Mack - Mitsurugi - Momo - M.O.M.O. - Morrigan - Regina - Reiji - Roll - Rose - Rutee - Ryu - Sabine - Sakura - Servbots - Shion - Stahn - Strider Hiryu - Sylphie - Taizo - Taki - Tarosuke - Tobi - Tron - Unknown Soldier P1 - Unknown Soldier P2 - Valkyrie - Volnutt - Waya Hime - Xiaomu
Astaroth - Nebiroth - Red Arremer Joker - M. Bison - Akuma - Evil Ryu - Juni - Juli - Solo - Strider Hien - Tong Pooh - Grandmaster Meio - Shtrom Jr. - Shtrom - Druk - Lord Raptor - Juno - Druaga - Yorimoto - Yoshitsune - Yoshinaka - Benkei - Amazona - Black Bravoman - Black Valkyrie - Zouna - Kamuz - Devil Kazuya - Ancient Ogre - Joka - Janga - Dokugozu - Dokumezu - Saya - Kyuju Kyu
Non-Playable Characters
Allen - Ishtar - Andaba - Enma - Otohime - Gamagaeru - Monmotaro - Lolo - High Priestess - Dr. Bomb
Project X Zone
Playable Characters
Akira - Alisa A. - Alisa B. - Arthur - Bahn - Batsu - BlackRose - Bruno - Chris - Chun-Li - Cyrille - Dante - Demitri - Devilotte - Erica - Estelle
Flynn - Frank - Gemini - Haken - Heihachi - Hsien-Ko - Ichiro - Imca - Jill - Jin - Juri - Kaguya - Ken - Kite - Kogoro - KOS-MOS - Kurt
Lady - Leanne - Lindow - Mii - Morrigan - Neneko/Neito - Pai - Reiji - Riela - Rikiya - Ryu - Sakura - Sänger - Saya - Servbots - Soma
T-elos - Toma - Tron - Ulala - Valkyrie - Vashyron - X - Xiaomu - Xiaoyu - Yuri - Zephyr - Zero
Rival Characters
Nemesis - Lord Raptor - Jedah - Seth - Vile - Astaroth - Shielder - Selvaria - Aya-me - Ciseaux - V-Dural - V-Dural (Statue)
Riemsianne - Coco ★ Tapioca - Skeith - Skeith Zero - Phantom - Vajra - Dokugozu - Dokumezu - Meden - Due - Eins - Drei
Non-Playable Characters
Aura - Iris
Project X Zone 2
Playable Characters
Akira - Alisa - Aty - Axel - Captain - Chris - Chrom - Chun-Li - Ciel - Dante - Demitri - Erica - Estelle - Felicia - Fiora - Flynn - Gemini
Goro Majima - Haseo - Heihachi - Hibana - Hotsuma - Ichiro Ogami - Ingrid - Jill - Jin - June - Kage Maru - Kazuma Kiryu - Kazuya - Ken - Kite
KOS-MOS - Leanne - Leon - Ling Xiaoyu - Lucina - Maya - Morrigan - Nana - Natsu - Pai - Phoenix - Reiji - Ryo - Ryu - Sakura - Segata
Strider Hiryu - Ulala - Valkyrie - Vashyron - Vergil - X - Xiaomu - Yuri - Zephyr - Zero
Juri - M. Bison - Nelo Angelo - Nemesis - B.B. Hood - Lord Raptor - Pyron - Sigma - Vile MK-II - Tong Pooh - B. Hayato - V-Dural - V-Dural (Statue) - Dural - Aya-me - Ciseaux - Ranmaru - Dokurobo - Shadow - Coco ★ Tapioca - Robot Axel - Unknown - Zagi - Marduk - Vajra - Skeith - Azure Kite - Saya - Dokugozu - Dokumezu - Sheath - Nine Nine - Byaku Shin - T-elos - Kamuz - Metal Face
Ustanak - Solo - Shtrom Jr. - Shtrom - Druk - Kurohagane α
Non-Playable Characters
Ada - Aura - Chizuru Urashima - Garigliano - Miyuki - Miles Edgeworth - Otohime - Sylphie - Tarosuke - Tiki