Roronoa Zoro is a crew of Straw Hat Pirates. Main character, Monkey D Luffy's first friend of Straw Hat Pirates. When he was caught by stupid king's son, Monkey D Luffy helped him. Zoro was in Luffy's pirates then.
He is a swordsman. He want to be the strongest swordsman of the world. He usually use three swords. It is three swords style. He use right hand, left hand, and mouth. He is strong enough without swords. His sword was given by his rival when he was a child. His rival was dead, so he want to be strong for her. His rival was a girl.
We can see he training so hard in the books. He is very serious about training. Maybe, He is the best to training of Straw Hat Pirates. He can cut stone, and iron.
He sometimes gets a really big damage by enemy. Every time, he gets damage his body's front. He said that wound of the back is a shame for swordsmen. So cool.