Gekko Moriah is a former Shichibukai who resided on the largest ship in the world, Thriller Bark. His frozen bounty is 320,000,000.He is also the main antagonist of the Thriller Bark Saga who stole the shadows of Brook and various other beings with the power of the Kage Kage no Mi. He is also a major antagonist in the Marineford Arc where he took part in the Battle of Marineford and sided with the Marines, along with most of the other Shichibukai. Upon the war's end, he was stripped of his title and was to be eliminated by Donquixote Doflamingo, but managed to escape before he was killed, leaving Moriah's overall status unknown.
Like other One Piece-based villains, he has a weird laugh- "Kishishishishishishishi!".