Though not a samurai, he appears to maintain a certain degree of bushido and is frequently mistaken for one. Unlike Luffy and most of the other Straw Hat Pirates, Zoro has been known to kill his opponents if he has to, though never in cold blood. It is shown that Zoro enjoys fighting a strong opponent (usually left to face down the second strongest villain in each arc, as Luffy faces down the strongest). When battling a worthy opponent Zoro tends to retain a maniacal grin and serious glare throughout.