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Description
Mr. 5, whose real name is Gem, is a former officer agent of the criminal syndicate Baroque Works, where he held the lowest rank among the organization's elite operatives. He operates alongside his assigned partner, Miss Valentine, as part of a numbered duo system employed by the syndicate.

His background is rooted in his service to Baroque Works, a secretive organization led by the Shichibukai Crocodile. As an officer agent, Mr. 5 carries out missions that typically involve assassination, elimination of targets, and disruption of the organization's enemies. He is first encountered during the Whisky Peak and Little Garden storylines, where he is dispatched alongside Miss Valentine to eliminate the infiltrator Miss Wednesday, who is later revealed to be Nefertari Vivi, the princess of Alabasta.

In terms of personality, Mr. 5 is characterized by a laid-back, unimpressed demeanor that masks a ruthless and arrogant nature. He carries himself with a sense of cool detachment, appearing unconcerned by the chaos around him, but he is fully committed to completing his missions by any means necessary. His arrogance stems from his dangerous ability and his position within Baroque Works, leading him to underestimate opponents at times. He is not a strategic thinker, preferring to rely on brute force and the spectacle of his explosive powers rather than careful planning.

His motivations are tied directly to his role in Baroque Works: he follows orders from higher-ranking members, such as Mr. 0, and seeks to carry out assignments efficiently to maintain his standing within the organization. He does not display personal ambitions beyond serving the syndicate and demonstrating his destructive capability.

Within the story, Mr. 5 serves as an early antagonist for the Straw Hat Pirates as they enter the Grand Line. He and Miss Valentine are the first officer agents to confront the crew directly, attempting to kill Vivi on Whisky Peak. Later, they reappear on Little Garden as part of a larger scheme orchestrated by Mr. 3, though their efforts ultimately fail due to the intervention of the Straw Hats. His role highlights the threat level of Baroque Works and sets the stage for the larger conflict in the Alabasta saga.

Key relationships include his partnership with Miss Valentine, with whom he shares a functional but not particularly close working dynamic. He also answers to higher-ranked agents such as Mr. 3 and ultimately to Crocodile himself. His interactions with the Straw Hat Pirates, particularly Roronoa Zoro and Monkey D. Luffy, are adversarial, and he is defeated by their superior combat ability.

Development for the character is limited. After the collapse of Baroque Works, Mr. 5 survives and later takes up a civilian occupation as a firefighter at the newly reopened Spiders Cafe, working alongside several of his former colleagues from the organization. This shift from criminal agent to ordinary worker represents a significant change in his life, but his personality and abilities are not further explored in depth.

His notable abilities stem from the Bomu Bomu no Mi, a Paramecia-type Devil Fruit that transforms his entire body into a living explosive. This power allows him to detonate any part of himself without taking harm, including his limbs, hair, breath, and even bodily secretions such as mucus. He can also generate explosive force from his coughs and create a technique called Breeze Breath Bomb, in which he infuses his breath into bullets fired from a revolver, causing them to explode on impact. His combat style is chaotic and relies on turning ordinary movements into destructive attacks, making him a dangerous close-quarters opponent despite his lack of strategic thinking.