Johnny's partner & fellow pirate bounty hunter. Though he wields a sword, he rarely gets to show his skill with it due to the level of the pirates he encounters after meeting Luffy. He and Johnny first meet Luffy & co. just after the "Black cat pirates" arc, when the tiny island he and Johnny are on is blasted by the Going merry while the crew is testing their new cannons. After they're both brought on board, Yosaku's bout of scurvy is cured, and they stay on the Going Merry for a while (since their boat was destroyed in the cannon blast). They tag along with the Straw Hats throughout the "Don Krieg" & "Arlong Park" arcs, after which they decide to remain behind at Cocoyashi village to help out the villagers. Both Yosaku and Johnny seem to know Zoro from several years before he joined the Straw Hats. In the anime, how they met Zoro is shown in a dream Zoro has.
Kuroobi is a ray-type fish-man. Kuroobi is one of the strictest members in his crew and has always been wary of Nami's supposed allegiance to Arlong. Kuroobi practices "Fish-Man Karate" (called "Merman Karate" in the now defunct 4kids dub) to fight his opponents. During the battle with the Straw Hats in the Arlong arc, he fights against Sanji whom he nearly defeats when the cook goes underwater to try and save Luffy. As a Fish-Man, Kuroobi has an advantage underwater. However, Sanji manages to force him up to dry land by breathing the air from his gills, suffocating him, and then promptly beats him into submission with his kicks. (Source: Wikipedia)
Dr. Nako (often simply called "Doctor") is a doctor from Cocoyashi Village. Although a relatively minor character overall, he was one of the major characters from Nami's childhood. He plays a major role in the flashback, while he plays a minor role in the present. He aids the crowd in fighting the Arlong Pirates and later tends the wounds of Zoro, Luffy, Yosaku, and Johnny. Nako grumbled about the crew having no doctor which gave Luffy an idea to find a doctor of their own. He then put the pinwheel tattoo on Nami's left arm to cover her stab scars. He wears a bandana with a red cross, a common symbol for medical personnel, (which is edited out in the English anime) and a sunglasses. First Appearance: Chapter 77; Episode 32 (Source: One Piece Wikia)
Captain Nezumi (�ズミ大� Nezumi Taisa) is a Marine Officer of the 16th Branch, in the East Blue. His appearance and manner are rodent-like (as "nezumi" is Japanese for both "mouse" and "rat"), and he is arrogant and decidedly corrupt. Nezumi takes bribes from Arlong, so the Fishman pirate can keep a low profile. Acting on a tip from Arlong, he uncovers the treasure that Nami had been hoarding in order to buy back Cocoyashi Village and confiscates it from her. After Arlong is defeated, Nezumi attempts to intervene against the Straw Hat Pirates, but he is quickly defeated and forced to return all that he stole. His report back to his superiors is what prompts the Marines to assign Luffy with his first bounty. First Appearance: Chapter 69; Episode 31 (Source: One Piece Wikia)
A teen model who's childhood friends with Narumi.
The manager of the group home where Momoko and Atari (among several others) live while in Tokyo. She has a nice personality though often gets her tenants to do work for her.
Nagisa Shiratori is a popular idol who cuts her hair and dresses up as a boy in order to go to a normal school without being recognised.