Zenny

Zenny is the old man from Goat Island. He is a debt collector who got stuck for 20 years in an island which was full of goats. He is suffering from a fatal disease, though he received medicine from Chopper. He had a childhood dream of becoming a pirate and decided, even though he was old, to sail the sea with the goats that he had trained to obey him. He is very happy to have got the chance to fulfill his dream, thanks to the Straw Hat Pirates.

Trivia

 * He beat Nami many times at the game of chess, but Robin managed to beat him.
 * Zenny is the currency used in Dragon Ball. Whether or not this is the reason for his name is unknown.