Roronoa Zoro is a central character in the anime and manga series 'One Piece.' He is a skilled swordsman who dreams of becoming the world's greatest swordsman. Zoro is one of the main crew members of the Straw Hat Pirates, led by the protagonist Monkey D. Luffy. Known for his strong sense of duty and loyalty, Zoro wields three swords in battle, a style known as 'Santoryu.' His determination, strength, and unique swordsmanship make him an essential asset to the crew on their adventurous journey across the Grand Line.