Xenosaga Episode I Reference

Characters and Locations

Use this page to identify who can solve a battle problem, which field character a prompt expects, or what a place name means in the route. It deliberately leaves plot biography to the game.

Choosing a party member

These are practical starting jobs, not fixed classes. Ether abilities can be transferred, equipment can add Skills, and Tech upgrades can push a character toward a different job.

Character	Best reasons to use them
Shion Uzuki	Flexible support and utility. Her native Ether covers healing, Boost control, and item stealing, while her Tech Attacks span several damage types. She is also the only character who can assemble Erde Kaiser.
KOS-MOS	Straightforward mixed damage. Her blades and drills cover physical attacks, her cannons cover Ether Beam damage, and X-Buster hits every enemy. Mode A7 adds useful debuffs.
Ziggurat 8	Durable front-line damage. His Tech Attacks cover Hit, Fire, Lightning, and other elements, while his native Ether emphasizes self-defense, self-recovery, and protecting an ally.
MOMO	Healing, rare-item theft, and Gnosis conversion. Magic Caster steals rare items during Star Wind, Dark Scepter turns defeated Gnosis into items, and Life Shot supplies early healing.
chaos	Party recovery plus Spirit and elemental damage. His native Ether includes group healing, status cleansing, and revival; Chained Blast can force a Pilot KO against Mech enemies.
Jr.	Ranged Pierce and Spirit damage, wide-target attacks, and ordinary-item theft with Psycho Pocket. Some optional field rewards also require Jr. or MOMO to lead.

For the actual move lists, see Tech Attacks, Ether, and Skills.

When the field leader matters

The character walking around the map is sometimes part of the solution. Known optional prompts and pickups can require a particular leader, including Jr. or MOMO for the playground PM Card and Jr. for Great Joe. The walkthrough calls these out where they occur. If an object or NPC does not react, switch to the named character before abandoning the opportunity.

Story and route characters

Name	Route context
Allen Ridgeley	Vector engineer and Shion’s assistant.
Andrew Cherenkov	Federation officer assigned to the Woglinde.
Captain Matthews	Captain of the Elsa.
Gaignun Kukai	Chairman of the Kukai Foundation.
Hammer	Elsa navigator and systems specialist.
Joachim Mizrahi	Scientist central to several sidequest and story references.
Juli Mizrahi	Scientist associated with MOMO and the Zohar research project.
Kevin Winnicot	Vector engineer connected to Shion and KOS-MOS.
Luis Virgil	Federation lieutenant encountered aboard the Woglinde.
Luty	Patient in the Dock Colony clinic. Giving her the Flower Seed begins an optional reward whose timing is missable.
Mary Godwin	Durandal bridge officer.
Miyuki Itsumi	Shion’s friend and Vector colleague.
Nephilim	Mysterious girl encountered by Shion.
Pellegri	U-TIC officer.
Professor	Robot Academy inventor who exchanges Robot Parts for Shion’s Ether abilities.
Scott	Professor’s assistant at the Robot Academy.
Sergeant Swaine	Federation soldier associated with Decoder 7.
Shelley Godwin	Durandal bridge officer.
Tony	Elsa pilot.
Wilhelm	Vector’s chief executive.
Albedo	Recurring antagonist fought as a Biological boss aboard Proto Merkabah.
Margulis	U-TIC commander fought as a Biological boss at Asteroid Pleroma.

Locations

Name	Route context
Asteroid Pleroma	The U-TIC facility where Ziggy searches for MOMO.
Cathedral Ship	The giant Gnosis area entered through the copied city.
City Sector 26 & 27	The explorable city sector on the Kukai Foundation.
Dock Colony	A service colony with the Talk to Me shop and optional returns.
Durandal	The Kukai Foundation flagship and recurring hub.
Elsa	The cargo ship that becomes the party’s main transportation hub.
Encephalon	A shared virtual environment used during the party’s investigation.
Gaignun’s Private Beach	A Kukai Foundation optional destination.
Ironman	The bar in City Sector 26 & 27.
KOS-MOS Simulator	The opening virtual combat simulator and an E.V.S. return destination.
Kukai Foundation	The Foundation colony and its City Sector 26 & 27.
Miltia	The city represented inside the Encephalon.
Our Treasure	The inn in City Sector 26 & 27.
Planetarium	The late Proto Merkabah route area.
Proto Merkabah	The final dungeon.
Research Lab	The laboratory floors within Proto Merkabah.
Robot Academy	The workshop inside the Kukai Foundation A.G.W.S. Parts Shop.
Song of Nephilim	The three-tower dungeon reached after the Kukai Foundation attack.
U-TIC Battleship	Jr.’s infiltration destination.
U-TIC Organization	The organization operating the Pleroma facility and battleship.
Vector Industries	Shion’s employer and a recurring investment name.
Woglinde	The Federation cruiser used for the opening mission.

An E.V.S. destination is a return tool, not a promise that the area is frozen exactly as it appeared during the story. See U.M.N. and E.V.S. before relying on a return visit for a missed shop, NPC, enemy, or field object.