Namako Otoko, also known as Sea Cucumber Man, is a supporting character in the manga and anime series Yaiba: Samurai Legend. His origin begins over a thousand years ago as an oni, a demon, whose soul was sealed inside a humanoid stone statue hidden in a cave near Mount Fuji. When the antagonist Takeshi Onimaru resurrects him alongside seven other oni using animal sacrifices, the demon takes on the physical form of a small sea cucumber, appearing as a cylindrical, spiky creature. He carries a distinctive verbal tic, ending his sentences with the suffix "zura." Despite his demonic origins, Namako Otoko is not inherently malicious. He quickly betrays Onimaru together with two fellow demons, Kamakuri Otoko (Mantis Man) and Hitode Otoko (Starfish Man), and aligns himself with the protagonist Yaiba Kurogane and his friends. From that point on, he becomes a constant companion to the group, most often seen perched on the shoulder of the female lead Sayaka Mine or tucked inside her collar. His motivations are simple: he wants to be helpful and to belong, though his efforts in battle frequently fall short and end in comedic failure. Throughout the story, he participates in the major arcs, including the battles against Onimaru's Four Heavenly Kings, the quest for the Dragon God Orbs, and the confrontation with the moon princess Kaguya. His key relationships are with Yaiba, whom he follows loyally; Sayaka, whose shoulder he occupies and who treats him like a pet; and his former demon colleagues Gerozaemon Geroda (Frog Man) and Kumo Otoko (Spider Man), who also switch sides. Over the course of the series, Namako Otoko develops from a minor antagonist into a harmless, affectionate mascot. In the epilogue, after Onimaru's defeat and the dissipation of his magic, Namako Otoko reverts to an ordinary sea cucumber, living peacefully in the pond of the Mine family mansion alongside Gerozaemon and Kumo Otoko. His notable abilities are limited; he possesses no great combat skills or special powers, but his small size and innocuous appearance make him an effective lookout and a source of comic relief.