Karoo

Karoo (カルー Karū), also spelled "Carue," is Vivi's pet spot-billed duck, a fast-footed riding bird (one of the fastest modes of transportation available in Alabasta). His role during Vivi's time with the Straw Hat Pirates is mostly that of comic relief, although he does relay valuable information to Chopper from time to time, helps Luffy and Usopp to defeat the Baroque Works agents in Little Garden and saves Vivi from Mr. 2 Bon Clay in Alabasta. His name comes from the Japanese word "karugamo," which means "spot-billed duck."

In a recent Japanese Fan Poll, Karoo is currently ranked the 47th most popular character in One Piece.