Roronoa Zoro is the stoic and fiercely loyal swordsman of the Straw Hat Pirates in One Piece. With green hair and a muscular build, he wields three swords in his unique Santoryu style, aiming to become the world’s greatest swordsman to honor a promise to his late rival, Kuina. Known for his discipline and poor sense of direction, Zoro is a formidable fighter and unshakable ally. His defining moment of loyalty was enduring Luffy's pain from Kuma, showcasing his unwavering dedication to his crew.