One Piece Chapter 6, page 4: Chapter 6: Number One

Captain Morgan and Koby stare in absolute shock, with Morgan uttering, "RORONOA ZOLO!!!" and Koby gasping, "...!!" Luffy, on the other hand, is completely thrilled, cheering, "WOW!! HE'S COOL!!" Zoro, holding his three swords in a deadly stance, stares down the execution squad with intense, cold eyes. He warns them, "THE FIRST ONE WHO MOVES... DIES." Terrified by his overwhelming aura, the Marines tremble and back away, whimpering, "EEEEK...!" and "HE'S SO SCARY...!"