Mercer

Biodata

Feature	Details
Name	Mercer (梅瑟)
Alias(es)	Abao; Panda Man
Gender	Male
Affiliation	Eternal Ark; formerly associated with the Beasts Pirates during his stay on Onigashima
Occupation/Role	Combatant, bounty hunter, blacksmith, teacher, builder of the Eternal Ark
First Appearance	Chapter 3

Power Progression

Stage / Realm / Level	Chapter	Notes
F+ Attributes	8	Materialized the A-rank Gifts Breathing and Precision with 50,000 Merit Points; Strength, Durability, Agility, Willpower, Spirit, and Mystery rose from F to F+, while Perception reached E-. 8
E- Attributes	11	Basic physical attributes reached E- through natural growth, Breathing training, running, and hunting. 11
E+ Attributes	30	Most physical and soul attributes reached peak E-rank after a year of blacksmithing, nutrition, and training; Stamina remained E. 30
D+ Attributes / B- Observation Haki	67	Manifested the A-rank Disguise Gift with 50,000 Merit Points. All base attributes reached D+; Perception broke through to C-, while Observation Haki reached B-. 67
Armament Haki awakened	94	Awakened Armament Haki while forging a three-meter-long saber on Onigashima. 94
Conqueror’s Haki demonstrated	123	Used Conqueror’s Haki to defeat Kuina instantly during their spar. 123
EX-class Body of All Things	112	Evolved Interaction using 100,000 Merit Points, gaining the EX-class Concept Gift Body of All Things. 112
Enhanced Spiritual Vision	134	Spent 100,000 Merit Points to enhance Spiritual Vision, gaining X-ray perception and the ability to perceive the fundamental trajectories of things. 134
B- Attributes / B- Armament and Conqueror’s Haki	167	Used Soul Crystals to raise Strength, Spirit, Willpower, Mystery, Armament Haki, and Conqueror’s Haki to B-. 167
Spiritual-Physical Unity	181	Improved Disguise through training with Asia, combining dynamic and static environmental concealment and achieving Spiritual-Physical Unity. 181
B+ Attributes / B+ Observation Haki	188	Acquired Devour Space; all basic Attributes reached B+, while Observation Haki advanced to B+. 188
A-rank Haki transformation	227	Underwent a transformation described as more fundamental than an A-rank breakthrough, akin to a species transformation; his Haki reached A-rank. 227
Transcendent	244	Completed his transformation into a Transcendent and entered the highest tier of combat power. 244
A+ Small World	264	Small World expanded to a 10,000-meter diameter; all of its Attributes reached A+ quality, and Mercer condensed the concept of circulation from Wind Essence. 264
Inner World Universe / World Authority	301, 303	Created an Inner World Universe centered on an Origin Star, consumed the World Fruit, gained infinite control over it, and later acquired Authority: World and the capacity to traverse worlds. 301 303
Source Life	309	Refined his energy into World-characteristic Source Power and became a Source Life capable of drawing upon Cosmic Source Power. 309
13/3000 World Authority	314	Possessed 13/3000 of the World Authority while exploring beyond his native world. 314
Origin-grade Magic Power	315	Developed Origin Magic Power in Aslant and could lower its quality to disguise himself as an ordinary mage. 315

Background / History

Mercer was raised on Drum Island by Kureha, who brought him along while treating villagers. By age one and a half, Garp was already checking on his condition and delivering supplies. 3 Kureha became his teacher, family, and close companion; Mercer absorbed knowledge and skills from her daily. 10

His early growth centered on Breathing techniques, physical training, hunting, forging, Haki, and the Merit Point system. He began operating as the disguised bounty hunter “Abao,” claiming bounties from the Marines while denying that he was a Devil Fruit user. 67 69

Mercer later spent time under Kaido’s orbit on Onigashima, though he did not consider himself Kaido’s subordinate. He fought King, defeated Yamato, awakened Armament Haki, and eventually escaped Wano with Yamato, Ulti, Page One, Bear Cub, Ushiwakamaru, Hiyori, and Kawamatsu. 89 91 94 96 106

He subsequently built a broad network of companions, trained numerous allies, created weapons, collected Devil Fruits and rare materials, and established the Eternal Ark as an expanding city and base. 149 203 262 263 His actions eventually reshaped global geography: he cut passages through the Red Line, connecting the four Blues and the first half of the Grand Line into the “Dream Sea” or “ALL BLUE.” 264

After creating his Inner World Universe and gaining World Authority, Mercer began traveling beyond his native world. He entered Aslant, studied magic for a year at Merdian Magic Academy, and collaborated with Jelff on research into life-and-death magic. 301 303 315

Appearance

Mercer’s appearance changes substantially through transformations, fusion states, age manipulation, and later rebirth. As a child, he was fair-skinned, clean, slightly chubby, and usually bundled against Drum Island’s cold. 3 10

• Short, slightly curly black hair and dark, bright eyes during his youth. 84
• Harmonious facial features and a naturally mischievous half-smile. 84
• By age eight or nine, he resembled a twelve- or thirteen-year-old boy. 84
• During later combat, he has waist-length black hair streaked with dark red and crimson-gold pupils. 188
• His Transcendent form has tan skin, black hair streaked with white, black wings, and gem-like red eyes. 221
• After rebirth through the World Tree, he emerged physically as an eighteen-year-old youth. 301
• Can adopt forms including Panda Man, a white-headed eagle, a black panther-like cat, and fused forms using Bear Cub’s or other abilities. 87 101 191 |

Personality

Mercer is pragmatic, independent, and highly confident in his own judgment. He repeatedly refuses recruitment by powerful organizations and individuals, including Shanks and the Marines, preferring freedom over institutional loyalty. 143 166 167

He is intensely curious, especially toward abilities, materials, history, magic, and the mechanics of Devil Fruits. This curiosity drives his forging, experimentation, exploration, and willingness to study unfamiliar systems. 52 94 315

Mercer can be blunt and ruthless toward enemies, pirates, traffickers, and those who threaten people under his protection. He kills without hesitation in several confrontations, yet also protects companions, saves Kuina, aids Hiyori and Kawamatsu, offers Law a home, and supports the growth of those around him. 69 101 167 181 193

Abilities & Skills

Haki

Mercer possesses all three types of Haki and uses them for combat, perception, healing, suppression, and advanced weapon techniques.

• Observation Haki — Reached B- by Chapter 67, later B+ by Chapter 188, and eventually A-rank. It can perceive life signatures, breathing frequencies, and large areas. 67 96 188 227
• Armament Haki — Awakened on Onigashima; can be condensed, projected through weapons, used for Ryuo techniques, and employed to stabilize Eriyi’s Dragon Blood fluctuations. 94 101 132
• Conqueror’s Haki — Can incapacitate weaker opponents instantly and be used in combat coating. 123 127 188
• Limit — Powerful Haki users can detect excessive use of Observation Haki, making careless perception dangerous. 200

Breathing Techniques and Unity of Heaven and Man

Mercer’s Breathing Gift enhances physical and spiritual development and serves as the basis for his interaction with the environment.

• Uses Breathing to improve attributes, maintain bodily control, and synchronize with natural forces. 8 11
• Can enter the Unity of Heaven and Man state, perceiving the breathing frequencies of surrounding things. 11 96
• Through Disguise and later training with Asia, he developed Spiritual-Physical Unity and environmental concealment. 181
• Can use Breathing to accelerate recovery and circulation within his body. 125

Body of All Things

An EX-class Concept Gift evolved from Interaction.

• Allows Mercer to interact with and perceive the operating trajectories of things alongside Spiritual Vision. 112 134
• Can be taught or demonstrated through fusion; Radiance learned it rapidly due to her special body. 295

Spiritual Vision

A Gifted Ability enhanced with Merit Points.

• Grants X-ray vision. 134
• Perceives frequency fluctuations, underlying trajectories, weak points, and conceptual structures. 134 255
• Supports advanced analysis of abilities, materials, space, and concepts. 295 299

Disguise

An A-rank Gift that manipulates Mercer’s interaction with the environment.

• Conceals his presence by synchronizing his aura and frequency with the surroundings. 67 98
• Can gather environmental force into attacks, such as strengthening his Finger Gun with wind and snow. 67
• Later evolved into a dynamic-and-static concealment method that no longer requires Asia’s synchronization. 181

Devour Space and Gray Mist

Mercer gained Devour Space after consuming a Devil Fruit.

• Stores objects and living beings within an internal space. 188
• Projects devouring force outward, capable of crushing steel and consuming targets not protected by sufficient Armament Haki. 188
• Absorbs materials, sea beasts, natural energy, Blood Coral, Devil Fruit powers, and other resources. 192 193 204
• Enables Spirit Form, fusion with companions, bodily modification, and extraction of Devil Fruit abilities. 199 221 295
• Can modify appearances and transform himself or others for concealment. 191 192

Devil Fruit Powers

Mercer obtains, studies, integrates, or distributes numerous Devil Fruit abilities rather than relying on a single power.

• Rumble-Rumble Fruit — Controls lightning and magnetic fields; enables lightning-speed movement and electromagnetic swordsmanship. 268 274
• Draw Fruit — Selected from Ryugu Palace’s treasury; absorbs status effects through physical contact. 203
• Age-Age Fruit — Used to alter age and comprehend the concept of years. 300 303
• Door-Door Fruit research — Integrated the ability into Radiance and refined Spatial Essence through spatial fluctuations. 295
• Transformation characteristics — Devoured the Cat Drowning Spring to gain an additional transformation module. 191

Forging and Weapon Crafting

Mercer is a skilled blacksmith capable of crafting and reforging high-grade weapons.

• Purchased rare metals and meteorite material to forge Bogard a sword. 52
• Forged a three-meter-long saber after awakening Armament Haki. 94
• Reforged Shanks’ weapon using magnetic alloy, allowing it to transmit Haki and convert it into electricity. 149
• Forged the A-rank revolver Grim Reaper using refined deep-sea metal. 200
• Crafted or reforged weapons for Yamato, Eriyi, Shirahoshi, Ushiwakamaru, Mihawk, and others. 123 203 204 255

Magic

After entering Aslant, Mercer developed and studied magic.

• Possesses Origin-grade Magic Power, which he can reduce to appear as ordinary Magic Power. 315
• Spent a year studying at Merdian Magic Academy’s library. 315
• Researched the boundary between life and death with Jelff. 315
• Uses Origin Magic for transformation and soul-related phenomena. 328

Equipment / Weapons / Items

• Cold Dew — Mercer’s sword; later subjected to further modifications and Devil Fruit-power separation. 91 263
• Baseball bat — Frequently carried while using the Panda Man identity. 69 87
• Long saber — Three-meter weapon forged on Onigashima. 94
• Grim Reaper — A-rank revolver forged from deep-sea refined metals. 200
• Eternal Ark / Eternal Ship — His island-ship city and mobile base, built with Crocodile and workers from multiple races. 262 263
• Vivre Cards — Uses them to maintain contact with allies, including Ushiwakamaru. 181
• Star Cup — Modified to merge with a new World membrane and travel into another world. 314

Relationships

• Kureha — Guardian, teacher, and family figure; raised Mercer on Drum Island and trained him in knowledge and medicine-related disciplines. 3 10
• Garp — Grandfather; their relationship is teasing but affectionate, despite Mercer’s refusal to become a Marine. 107 167
• Ace — Younger brother; Mercer trains, protects, and spars with him. 127 129 132
• Sabo — Brother and trainee; Mercer gave him the Mera Mera no Mi. 129 134
• Bear Cub — Adopted younger brother and close companion; Mercer taught it Devil Fruit control and later traveled with it extensively. 8 129
• Yamato — Companion and frequent sparring partner; Mercer freed her shackles temporarily, escaped Wano with her, and helped develop her body and combat ability. 91 106 188
• Eriyi — Close companion whom Mercer treats as a younger sister; they later travel, cultivate, and develop Authorities together. 194 303 329
• Robin — Companion and administrator; Mercer values her intelligence work and entrusted her with control of the Eternal Ship. 68 263
• Perona — Companion with a playful but contentious dynamic; Mercer helped awaken her Material Spirit Form. 69 134
• Ushiwakamaru — Student and ally from Wano; Mercer helped him grow stronger and gave him a Great Grade Sword. 96 123
• Hiyori Kozuki — Wano ally; Mercer agreed to take her away so she could learn swordsmanship and become stronger. 101
• Law — Rescued ally who joined Mercer’s group after Mercer offered him a home. 167
• Shanks — Friendly rival; Mercer trained Shanks’ crew, reforged Shanks’ weapon, and later fought him alongside Mihawk. 149 274
• Mihawk — Swordsmanship rival and associate; repeatedly seeks sparring matches with Mercer. 184 227
• Crocodile — Later partner in building and operating the Eternal Ark; serves as captain in name. 263 266
• Shirahoshi — Mercer teaches her about Sea King powers, forged her a trident, and became involved in protecting her from Vander Decken IX. 197 204
• Radiance — Lifeform created through fusion of Mercer, Radiance, and Nami; Mercer teaches her combat and integrates abilities into her body. 294 295
• Jelff — Magic-research collaborator in Aslant, sharing Mercer’s interest in the boundary of life and death. 315
• Mebis — Magic student whom Mercer taught after explaining her Origin Fruit’s nature. 329

Story Role / Major Arcs

Drum Island and Early Training

Mercer is raised by Kureha, develops his initial Attributes and Gifts, and begins cultivating Breathing, perception, and combat foundations. 3 8 11

Bounty Hunter Abao

Using Panda Man disguises, Mercer hunts pirates, gathers Soul Crystals, claims bounties from the Marines, and establishes himself as the bounty hunter Abao. 68 69 87

Wano and Onigashima

Kaido brings Mercer to Onigashima, where he clashes with King and Yamato, awakens Armament Haki, gains access to Wano’s swordsmanship methods, and leaves with Yamato and others. 89 94 101 106

East Blue Training Period

Mercer reunites with Ace and Sabo, trains his growing group in Rokushiki and combat, works with Shanks’ crew, and develops his companions’ abilities. 127 132 149

Alabasta and Fish-Man Island

Mercer defeats Gecko Moria, acquires Devour Space, assists Tom, confronts traffickers and Hody Jones, protects Shirahoshi, and obtains materials and Devil Fruits from Ryugu Palace. 183 188 193 195 203

Eternal Ark and Global Expansion

Mercer creates the Eternal Ark, builds a multi-racial city, dismantles slave-auction islands, opens routes through the Red Line, and announces the World’s Number One Swordsman Tournament. 262 264 266

New World Dominance

Mercer enters the New World, defeats major figures including Big Mom, develops his Transcendent abilities, and expands the Eternal Ark’s influence. 268 274 289

Inner World and Otherworld Travel

Mercer evolves his Small World into an Inner World Universe, gains World Authority and Source Power, defeats Im, crosses the World Boundary, and enters Aslant to study magic. 301 309 313 314 315