Gecko Moria had a past bounty of 320,000,000 million beli (only 20 million beli higher than Luffys current bounty) so he is far stronger than Crocodile was (who only had a past bounty of 80 million).
Moria is the captain of the world's biggest pirate ship, Thriller Bark, and has a former bounty of 320,000,000 Beli. Moria apparently has the power to turn people's shadows (including his own) into solid objects due to the power of the Kage Kage no Mi (Shadow Shadow Fruit), but the full extent of his powers are yet unknown. He is the one who stole Brook's (musician and sword fighter who is strongly inclined to join the strawhat crew and thanks to his devil fruit he can't die or sink in water, although he looks like a bleached skeleton with an afro because he was half-dead for a very long time, he is also part of the crew that left Lamboon the whale behind, the crew didn't run but was actually destroyed by Gecko Moria), and various other beings' shadows. The loss of a being's shadow causes them to go into a two day coma, and to be vaporized if they come in contact with sunlight. The shadow acts a second soul, duplicating its owner's movements and mannerisms.
Moria creates zombies by inserting a shadow into a lifeless corpse. Coupled with physiologically enhanced bodies engineered by Hogback, he is able to create powerful and obedient zombie warriors. However, if the original owner of the shadow dies, the zombie created from that person's shadow will also die. As a result, Moria has the de-shadowed people placed on their ship and removed from Thriller Bark.
He is an extremely large man and has a devil-like appearance, mainly due to his horns and shadowy figure. He wields a pair of gigantic scissors that he uses to cut the shadows of his victims from their bodies upon seizing them. He also has X like marks above his nose and below his chin that may be stitches. Moria's motto is to rely on others to reach his goals. His favorite phrase is: "You do it!", reflecting his slothful personality and tendency to leave all work for his underlings. This also expands to his fighting style, as he prefers to lay back and let his own shadow, Doppelman, battle with the powers of the Kage Kage no Mi.
He has captured Luffy and has taken away his shadow. He has placed it in the giant 900th zombie named Oz, and plans to avenge his defeat at the hands of a person named Kaidou in the New World. Luffy has recently found Moria inside Oz's freezer, and started to battle him. Moria has revealed that the only way for all of the shadows to return to their original masters is for him to give them the order to do so.