Bart

Biodata

Feature	Details
Name	Bart Romanov
Alias(es)	“Discarded failure”; the Marines’ former “secret weapon”
Gender	Male
Affiliation	Formerly the Marines; later Lin Feng’s pirate crew and first companion
Occupation/Role	Fighter; Lin Feng’s companion and subordinate
Status	Alive
First Appearance	Chapter 25

Power Progression

Stage / Realm / Level	Chapter	Notes
Steel Fruit user and former Marine experimental subject	25–26	Uses the Paramecia-type Steel Fruit to transform his body into steel and reinforce his defense.
Approximately Marine Vice Admiral level	28	The system assesses Bart at approximately Marine Vice Admiral level after he joins Lin Feng’s crew.
Bond-enhanced fighter	28	His bond with Lin Feng grants Strength +50, Speed +30, Constitution +100, and the passive Steel Body bonus.
Time-Space Training Room cultivation	33	Trains with Lin Feng under accelerated time and adjustable gravity, though no new formal rank is stated.
Defeats CP8 agent Carl	44	After Lin Feng’s command, Bart overwhelms Carl with Armament Haki and defeats her with a single punch.

Background / History

Bart was born in a fishing village and was raised by his grandfather. When Bart was ten, pirates attacked the village and killed his grandfather while he protected Bart. His grandfather’s final command was for him to stay alive 26.

Afterward, the Marines captured Bart and used him as an experimental subject in an attempt to create human weapons. They subjected him to brutal training, drug injections, invasive procedures, psychological abuse, and attempts to control the Steel Fruit’s side effects. Other test subjects died, went insane, or were dissected 26.

Bart eventually escaped after killing his guards during a mission. He hid alone in the ruins of a deserted island, convinced that the Marines would eventually come looking for their abandoned weapon 25 26.

Lin Feng defeated Bart after exploiting the limits of his speed and Armament Haki. Rather than killing him, Lin Feng offered him freedom, companionship, and the chance to live for himself. Bart accepted and became Lin Feng’s first official companion 27 28.

Bart later revealed that he wanted to find the woman and young girl shown in an old photograph kept inside his pocket watch. Lin Feng promised to help him find his family 31.

Appearance

Bart is a large, heavily scarred man with an intimidating presence. His body can become metallic through the Steel Fruit, and his enhanced forms turn him into a towering steel giant.

• Scarred face and weathered features.
• Massive, heavily muscled build.
• Gray-blue eyes.
• Steel-like body when using his Devil Fruit.
• Can expand into a five-meter-tall steel form and a six-meter-tall Overclock Mode 27 28.
• Carries a pocket watch containing a photograph of his presumed family 28 31.

Personality

Bart initially appears cold, hostile, and distrustful. Years of captivity and experimentation left him convinced that he was nothing more than a weapon or a discarded failure. He reacts aggressively when he believes Lin Feng was sent by the Marines 25 26.

Despite his harsh exterior, Bart retains compassion and the capacity to trust. He warns Lin Feng about the cursed Demon Sword even while they are enemies, and later accepts Lin Feng’s offer after recognizing the possibility of freedom and companionship 26 28.

After joining Lin Feng, Bart becomes a quiet but loyal companion. He follows Lin Feng’s orders, protects the Gale, trains alongside him, and trusts his captain’s judgment even when he does not understand it 31 33 43 49.

Abilities & Skills

Steel Fruit

Bart possesses the Paramecia-type Steel Fruit, which allows him to transform his body into steel.

• Greatly increases his physical durability.
• Allows him to withstand sword strikes, cannon-like blows, and powerful martial techniques.
• Can reinforce specific parts of his body, such as his fists.
• Steel Fortress lets him brace himself against powerful impacts and waves 27 47.
• Steel Heavy Fist gives his punches enough force to stagger a colossal Sea King 47.
• His steel body can be combined with Armament Haki for additional defense and striking power.

Steel Body Forms

Bart can use increasingly powerful transformations of his Steel Fruit.

• Steel Body — Covers his body in steel and provides exceptional defense 25.
• Steel Body Form — Expands Bart into a five-meter-tall steel giant and greatly increases his strength 27.
• Overclock Mode — Expands him to approximately six meters and represents his final trump card 28.
• Steel Body: Final Form — Used to deliver the Steel Fist: Extinction Strike 28.

Armament Haki

Bart can coat his body and attacks in Armament Haki.

• Reinforces his steel body.
• Allows him to withstand Carl’s Tekkai and Shigan techniques 43.
• Enables him to defeat Carl with a single punch after Lin Feng orders him to end the battle 44.
• His Haki was initially weaker than Lin Feng’s and could not be maintained indefinitely 25 27.

Physical Strength and Durability

Bart’s greatest advantages are raw strength and defense.

• His punches can shatter stone and send opponents crashing through walls 25 27.
• He can fight powerful opponents directly without relying on evasion.
• He withstands attacks from a colossal Sea King while defending the Gale 47.
• His major limitation is speed; Lin Feng repeatedly identifies Bart as powerful but comparatively slow 25 27.

Combat Endurance

Bart can continue fighting after severe injuries and prolonged battles.

• Survives repeated clashes with Lin Feng’s sword techniques.
• Recovers enough to leave the underground ruins after his defeat 28 31.
• Trains under accelerated time and increased gravity alongside Lin Feng 33.
• Reinforces the damaged Gale throughout Lin Feng’s duel with Hawkeye, despite the strain of the battle 49 50.

Equipment / Items

• Pocket watch — Contains an old photograph of a woman and a young girl whom Bart identifies as his family 31.
• Sword — Bart is shown carrying a sword while confronting the CP8 agents 43.

Relationships

• Lin Feng — Captain, rescuer, and first trusted companion. Lin Feng offers Bart freedom and promises to help him find his family. Bart becomes fiercely loyal to him 28 31.
• Bart’s grandfather — His childhood guardian, who sacrificed himself during a pirate attack and urged Bart to stay alive 26.
• Bart’s family — A woman and a young girl shown in the photograph inside his pocket watch. Bart’s dream is to discover whether they are still safe 31.
• Carl — CP8 martial artist and opponent. Their battle remains even until Bart uses Armament Haki to defeat her on Lin Feng’s command 43 44.
• Buvis — CP8 agent who fights Lin Feng while Bart battles Carl. Bart witnesses Buvis’s defeat and Lin Feng’s overwhelming strength 43 44.

Story Role / Major Arcs

Marine Weapon and Desert Ruins

Bart first appears as the guardian of an underground ruin and attacks Lin Feng with the Steel Fruit. Their initial battle exposes Bart’s tremendous defense and strength, but also his slower movement and limited Haki endurance 25 27.

Recruitment into Lin Feng’s Crew

After defeating Bart, Lin Feng refuses to kill him. He identifies Bart’s suppressed longing for freedom, recognition, protection, and companionship, then invites him to join his crew. Bart accepts, becoming Lin Feng’s first companion and triggering the system’s Bond Function 27 28.

The Demon Sword and Bart’s Dream

Bart warns Lin Feng that the Demon Sword can control its wielder and drive them to kill their companions. After Lin Feng subdues the sword, Bart begins to trust him more deeply 26 29 31.

Bart also forms his first clear personal dream: finding his family. Lin Feng promises to help him, changing their relationship from captain and recruit into genuine partnership 31 32.

Training and Voyage to Alabasta

Bart trains with Lin Feng in the Time-Space Training Room and adapts to increased gravity. He remains loyal and works to close the gap between himself and his captain 33.

CP8 Conflict

When Buvis and Carl intercept Lin Feng’s group, Bart fights Carl while Lin Feng battles Buvis. Bart uses his steel body and Armament Haki to withstand Carl’s martial techniques, then defeats her with a single punch after Lin Feng gives the order 43 44.

Support During the Hawkeye Duel

During Lin Feng’s duel with Hawkeye, Bart cannot intervene directly because of the vast difference in swordsmanship. Instead, he uses the Steel Fruit to reinforce the damaged Gale, protecting the ship and allowing Lin Feng’s battle to continue 48 50.

Notable Quotes

“I was once... the Marines’ secret weapon.” 25

“I... want to find them. I want to know whether they... are doing well...” 31

“From the moment you brought me out of that hellhole, I decided to follow you, Captain.” 42

Trivia

• Bart’s grandfather’s final words—“stay alive”—become a defining memory of his childhood 26.
• Lin Feng’s Bond Function grants Bart attribute-based bonuses after Bart joins the crew 28.
• Bart is disturbed by the Demon Sword’s bloodlust and worries that it may eventually influence Lin Feng 31 34.
• His role changes from isolated experimental weapon to Lin Feng’s first companion and subordinate.