Stealth Black is an invented Germa 66 figure who appears inside the in-story comic Sora, Warrior of the Sea. The Vinsmoke Family built a Raid Suit patterned on his look, and that very suit later passed to their third son, Sanji.
According to Trafalgar Law, Sanji wearing his Raid Suit looks a great deal like this comic figure. Curiously, the anime gives the character a yellow Germa suit emblazoned with a white skull, paired with a caped numeral three, dark eyewear, and a neck ascot. Scruffy hair recalls Sanji's, the face stays bare across the nose and mouth, and the whole design comes off plainer than Sanji's own.
Sanji's transformed form differs in its detailing. The front of his hair parts into two points, one angled up and one down, while the black outfit echoes Niji's styling. A cape lined in red carries a bold white three on its left side, joined by ear guards, a vivid red ascot, white gauntlets, a white belt with a skull-and-horn buckle, and trousers trimmed in bright gold.
Through his Raid Suit he wields the same baseline powers every Germa 66 soldier shares, and he also carries one trick of his own: he merges into his surroundings so completely that he becomes, for all purposes, unseen. Within the pages of Sora, Warrior of the Sea, he served as one of the enemies set against the protagonist. As a side note, Sanji's distaste for his own bloodline led him to reject the Stealth Black title while battling Page One, instead calling himself O-Soba Mask.

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The original Stealth Black is a fictional Germa 66 villain who appears in the in-story comic Sora, Warrior of the Sea. Sanji's Raid Suit was later designed to resemble him.
Stealth Black's special ability is to merge into his surroundings so completely that he becomes, for all purposes, unseen, essentially granting near invisibility.
Sanji's Raid Suit was patterned after Stealth Black, though Sanji personally rejected that name and called himself O-Soba Mask while battling Page One.
The anime gives Stealth Black a yellow Germa suit emblazoned with a white skull, a caped numeral three, dark eyewear, and a neck ascot, with scruffy hair recalling Sanji's own.
Sanji's version splits his hair into two points, wears a black outfit echoing Niji's styling, and adds a red lined cape with a white three, ear guards, a red ascot, white gauntlets, and gold trimmed trousers.
Looking for more on Stealth Black? The One Piece Wiki on Fandom has a dedicated page with community notes.
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