Marin is a male captive of the Sabaody slave trade whose owner made him pose as a mermaid. Penned in a tank he could barely move in, he was shown off to potential buyers, though no one was fooled by the costume.
Marin is a heavyset, large man got up to pass for a woman. Blonde hair worn long and applied makeup top off the disguise, yet stubble lingers around his mouth. He has on a swimsuit covering his chest, a counterfeit mermaid tail, and a slave collar chained at his neck.
Confined to an aquarium-style cell, Marin looked worn out and miserable as he paddled around, since he is no genuine merfolk and has no way to draw breath beneath the water.

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Captured by slavers at some earlier point, Marin was put on display before Luffy, Hatchan, and Pappag during their hunt through the slave shops for Camie. A chain collar bound him and the cramped tank left him scarcely able to swim. The shopkeeper paraded him in front of the trio, but the shoddy mermaid getup convinced none of them. The anime expands the scene: Marin first lounges on a couch smoking when the group walks in, scowling at Pappag, and after the owner sends him off he turns up in the cell, prompting Pappag to recognize him as the same figure from before. He still seems to be merchandise the owner meant to sell.
Marin is a male captive of the Sabaody Archipelago slave trade whose owner forces him to pose as a mermaid. He is penned inside a cramped tank and displayed to potential buyers, though no one is fooled by the disguise.
Marin's owner dresses him as a mermaid to try to pass him off as a rare specimen to buyers at the Sabaody slave shop. The disguise includes long blonde hair, makeup, and a fake mermaid tail, but stubble around his mouth gives him away.
When Monkey D. Luffy, Hatchan, and Pappag search the slave shops for Camie, they find Marin chained by a slave collar inside an aquarium-style tank, barely able to swim and looking worn out and miserable.
The anime expands Marin's appearance by first showing him lounging on a couch and smoking when the group walks in, before he turns up again in his cell, prompting Pappag to recognize him as the same figure from before.
No, Marin is not a real mermaid. He is a large human man whose owner dressed him up to fake the part, and the shoddy costume convinces none of the onlookers who see him.
Looking for more on Marin? The One Piece Wiki on Fandom has a dedicated page with community notes.
View on FandomThis content is original writing by Daddy Jim Headquarters based on the One Piece anime series, manga, and official materials. Episode and chapter references are cited where applicable.
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