Roronoa Zoro is also known as "Pirate Hunter" Zoro

He is the 2nd member of Luffy's crew and the first one to join it 

Zoro currently have the bounty of 320,000,000 Berries 

His dream is to become the greatest swordsman in the world 

He uses 3 swords at the same time, holding one in each hand and one in his mouth 

Wado Ichimonji (white), Sandai Kitetsu (red), and Shusui (black), the three swords that Zoro owned 

Zoro's strongest technique is 3-sword style secret called Ichidai Sanzen Daisen Sekai

Soon in Wano Country Arc, Zoro will use King of Hell Three Sword Style