Roronoa Zoro

Roronoa Zoro (ロロノア・ゾロ) also known as "Pirate Hunter" Zoro is a master swordsman and a former bounty hunter. He was the first member to join the then yet formed Straw Hat Pirates and is considered as one of the Monster Trio alongside Luffy and Sanji. He is one of the main protagonists of the  series.

In Super Smash Flash 2
Roronoa Zoro makes a cameo appearance as a Background character in Super Smash Flash 2 on the Thousand Sunny where he is seen sleeping on the left side of the ship. He is among the numerous background characters including Nami, Sanji, Franky, Nico Robin, Usopp, Tony Tony Chopper and Brook. Unlike all the characters who pose after a KO, Zoro remains sleeping through out the entirety of a match.

Trivia

 * Luffy's fourth costume is directly based on Zoro.