Roronoa Zoro (ロロノア・ゾロ, spelled as "Roronoa Zolo" in some English adaptations), also known as "Pirate Hunter" Zoro (海賊狩りのゾロ, Kaizoku-Gari no Zoro), is a fictional character in the One Piece franchise created by Eiichiro Oda.
In the story, Zoro is the first crewmate to join Monkey D. Luffy's crew after he is saved (by Luffy and Koby) from being executed at the Marine Base by Captain Morgan. He is the crew's combatant, and one of the two swordsmen of the Straw Hat Pirates, the other being Brook. As a native to the East Blue, he came from the village known as Shimotsuki, where he trained in a dojo and learned the one and two-sword styles (ittōryū and nitōryū), also he is proficient in both Armament Haki and Observation Haki, as well as being one of the few known characters who possess Conquerors Haki.
Zoro is uniquely known as an expert of Santōryū (Three Sword Style), where he wields a third sword with his mouth in combat. Throughout the series, his primary sword is Wado Ichimonji, one of the World's 21 great swords that he inherited from a childhood friend Kuina, and is frequently the sword that he wields in his mouth, while the other two swords frequently change over time and get better. He also has a habit of frequently going into the wrong locations which is a running gag throughout the whole series.
Roronoa Zoro first appears in the manga chapter "Enter Pirate Hunter Zoro" ("海賊狩りのゾロ"登場, Kaizoku-gari no Zoro Tōjō), first published in Japan's Weekly Shōnen Jump magazine on August 18, 1997, and first appeared in 1st Episode of anime. He first appears as a captured criminal awaiting his execution at the hands of the Marines. Before the beginning of the series' narrative, Zoro loses his childhood friend Kuina and vows to get the strongest swordsman in the world.
For years, he hunts pirates only to get money for food in the company of his friends Johnny and Yosaku. When Luffy offers Zoro to join his crew, he initially refuses. However, after Zoro is saved from being executed by Captain Morgan, he joins Luffy. When he discovers that the best swordsman in the world is Dracule Mihawk, Zoro thinks only to beat him one day. However, he is defeated at Mihawk's hands at the Baratie restaurant.
Zoro appears in a special episode of One Piece X Toriko, fighting Zebra and Vegeta, Zoro appears lost, searching his crew, until Zebra appears to Zoro, and Vegeta appears searching Goku to "settle the score", the three were furious and fought among (without ending).