Gecko Moria

Gecko is a member who currently resides on the floating island, Thriller Bark. He is the one who stole Brook's, and various other beings' shadows, and seems to be somehow connected to the ghosts on Thriller Bark. The loss of a being's shadow causes them to be vaporized if they come in contact with sunlight. His former bounty was higher than Luffy's 300 million bounty according to Robin.