Emer is a former slave who was freed by the Pathfinder Pirates and was asked to join them. He is a dwarf but lost his tail when he tried to escape from the slave traders. For most of his life Emer was sick with a mysterious disease that made him grow a single horn on his head. Emer ate the Torento torento no mi that allows him to transform into a Treant. Emer is the last one to join the Pathfinder Pirates.