West Sea

Biodata

Feature	Details
Name	West Sea (西海)
Alias(es)	West Blue
Ruler	Lin Qi, the King/Emperor of West Blue
Affiliation	Lin Qi's Empire and the West Sea military
Occupation/Role	Independent sovereign realm, military power, and refuge for allied peoples
Population	150 million residents by Marineford Era 1516 156
Status	Active
First Appearance	50

Power Progression

Stage / Realm / Level	Chapter	Notes
Regional foothold	68	Lin Qi's territory reaches one-seventh of the West Sea, encompassing eight kingdoms and 39 million people.
Covert expansion	103	Five puppet kingdoms wage wars of expansion, conquering 20 nations; Lin Qi secretly controls 33 of the West Sea's 58 countries.
Complete unification	155	The remaining nations are conquered through the Empire's subsidiary kingdoms. After five years, Lin Qi becomes King of West Blue.
Consolidated empire	156 157	The state governs 150 million residents, fields 800,000 West Sea Marines and 300,000 Self-Defense Force troops, and publicly recognizes Lin Qi as Emperor after his departure from the Marines.
Recognized great power	172 174	The West Sea repels four Admiral-level attackers, killing former Admiral Fosster and forcing the World Government's forces to withdraw.
Multiracial expansion	364 413 628	Amazon Lily is relocated into the West Sea; the Giant Tribe settles around the transplanted World Tree; Fish-Man Island's relocation to New Fish-Man Island is arranged.
Advanced war state	763 767 773	The West Sea deploys Mystic Armor Guards, Pacifistas, Pluton Battleships, Pluton Mechas, and the Giant Soldier Army; its defenses destroy an attacking force of 1.4 million soldiers without casualties.

Background and History

Lin Qi first entered the West Sea with Robin through a World Transfer Scroll, arriving in Baron Kingdom. He chose the kingdom because its people had not yet fallen into complete misery. 50

His early expansion relied on indirect rule. He manipulated the royal succession of Willis Kingdom, then secretly installed and controlled the rulers of five major West Sea kingdoms. These client states were ordered to expand through war, turning the sea into a conflict zone while drawing attention away from Lin Qi's own hand in the campaigns. 102 103

By Marineford Era 1515, the client kingdoms had absorbed every remaining state in the West Sea. Lin Qi became King of West Blue on June 1, 1515, activating the Divine Kingdom Function and its technology-oriented development paths. 155

The World Government eventually uncovered the scope of his influence. After receiving an arrest order through Sengoku, Lin Qi left the Marines and placed the nation on a war footing. The Seven Kingdoms publicly recognized him as Emperor of West Blue, openly severing the West Sea from World Government control. 157

Government and Society

• Lin Qi's administration expanded grain production, built roads and household running water, established shelters and long-term granaries, and reformed healthcare, law, military organization, and martial training. 103
• The Divine Kingdom Function unlocked Brass Country, spreading brass technology throughout the West Sea, and Strong as an Ox, a physical-strength enhancement. 155
• The later Stability upgrade reduced crime and increased public happiness, while Giant's Shoulders accelerated the development of civilian specialists. 310
• Fujitora praised the West Sea's stability and peace, choosing to remain there longer. 415
• During the expected global flooding, the West Sea consolidated hundreds of islands into major population centers, including the Eternal Imperial Capital, New Elbaf, and Qingzhou. 615

Territory and Settlements

Eternal Imperial Capital

The Imperial Capital was expanded through land reclamation and Kakashi's earth manipulation until it reached roughly half the size of Alabasta. Its foundations were raised enough to remain safe unless sea levels rose by 208 meters. 615

Amazon Lily

Lin Qi carried the entire island of Amazon Lily from the Grand Line to the West Sea over more than a month. Its movement created the legend of a storm-borne “Ghost Island,” and it was ultimately placed on a prepared platform in the heart of the West Sea. 363 364

New Elbaf

The Giant Tribe relocated beside the transplanted World Tree, creating a new Elbaf within the West Sea. The giants later formed the Giant Soldier Army as part of the realm's defense force. 413

New Elbaf became a major global trade hub through Robin's market and the World Tree's freshwater fountain service. Merchant vessels could use the World Tree to reduce a return journey from East Blue from six months to three days. 671

New Fish-Man Island

After Fish-Man Island was devastated, Lin Qi offered its residents a new homeland in the West Sea. King Neptune accepted the arrangement to relocate his people to the still-developing New Fish-Man Island. 628

Military and Technology

Armed Forces

• West Sea Marines — 800,000 personnel by Marineford Era 1516, supported by a 300,000-strong Army Self-Defense Force. 156
• Heavenly Stems and Earthly Branches — Special forces formed from loyal soldiers granted the Window-Window, Healing, and Memory-Memory Devil Fruits. 155
• Giant Soldier Army — 500 elite Giant warriors led by Dorley and Brogy; their combined Hagoku annihilated 10,000 enemy soldiers in a single attack. 769
• Mystic Armor Guards — 500 guards deployed during the expedition against Mary Geoise. 763
• Pacifistas and Pluton Mechas — The late-war army includes 100 Mark III Pacifistas and 1,210 Pluton Mechas operated by 500,000 Marines. 763 773

Brass and Aerial Warfare

• Brass Technology — Unlocked across the West Sea through the Divine Kingdom Function. 155
• Annihilator Flying City — A flying fortress capable of bombarding enemy fleets from beyond their effective range. 318
• Transforming mecha — Machines able to shift from Gatling guns into chain swords while supporting soldiers in exoskeleton armor. 318
• Sky Monitoring Platform — A moon-linked surveillance system that observes every corner of the West Sea. 727
• Thundercloud weapon — A Brass and Meteorological Technology weapon that can launch an Admiral-level lightning strike after a long charge; it is designed primarily to destroy large invading armies. 727

Pluton Program

After the World Tree took root, West Sea scientists found Treasure Tree Adam and several other extraordinary woods among its branches. These resources allowed the Pluton blueprints in Lin Qi's possession to be put into production, potentially producing a Pluton stronger than prior generations. 413

Construction of Pluton Battleships began by the following year, and large numbers were fielded during the campaign against Mary Geoise. 415 763

Major Conflicts

• First World Government assault — The World Government dispatched Admiral-level forces after Lin Qi declared the West Sea independent. The West Sea successfully defended itself and drove the attackers away. 157 172
• West Sea Defense War — Kaido and Big Mom jointly declared war on the West Sea. Lin Qi's forces held their homeland, while the Pirate Alliance was nearly annihilated and eventually withdrew. 305 350 352
• World Government–Blackbeard invasion — The World Government launched a surprise campaign against the West Sea while cooperating with Rocks, who occupied Blackbeard's body. West Sea reinforcements protected Fish-Man Island and forced Rocks to retreat. 721 746
• Final war against the World Government — Lin Qi declared war on Mary Geoise and led the West Sea's expedition force against the World Government. The conflict escalated into a mass battle involving Pluton weaponry, giants, ancient machines, and Sea Kings. 760 763 773 794

Relationships

• Lin Qi — Founder, ruler, and principal defender of the West Sea; he unified its nations and declared himself Emperor after leaving the Marines. 155 157
• World Government — Primary hostile power; it repeatedly invaded the West Sea and sought Lin Qi's execution. 157 172 721
• Giant Tribe — Settled in New Elbaf after the World Tree's relocation and pledged loyalty to Lin Qi. 413
• Amazon Lily — Relocated into the West Sea, binding the island's future to Lin Qi's realm. 364
• Fish-Man Island — Allied population offered a permanent new homeland through New Fish-Man Island. 628
• Robin — Key administrator who manages territorial affairs and established New Elbaf's trading market. 68 671
• Fujitora — Praised the West Sea's stability and remained there for an extended stay. 415