Crocus is a supporting character in the anime and manga series One Piece. He is an elderly doctor who resides inside the giant whale Laboon at Reverse Mountain, where the Grand Line begins. Crocus once served as the doctor of the Roger Pirates, the crew led by the Pirate King, Gol D. Roger. He is known for his medical expertise, calm demeanor, and caring nature, particularly towards Laboon, whom he tends after as a promise to the whale's former companions. Crocus aids the Straw Hat Pirates when they first enter the Grand Line.