Moria systematically takes down several Straw Hats, including Nico Robin, Sanji, and Chopper.
Gecko Moria & Oars vs. the Straw Hat Pirates. Plot Highlights:
During the battle against the Straw Hat Pirates, Moria demonstrates that by manipulating a person's shadow, he can force their physical body to change its shape as well.
Moria also uses a useful defensive feature of his Shadow-Shadow Fruit powers to instantly switch places with his shadow, Doppelman , allowing him to evade attacks—such as when he rendered Nico Robin's Clutch attack useless by swapping locations with his shadow. Episode Overview
Chopper deduces that Oars originally died from frostbite 500 years ago in the Land of Ice.
"Moria Destroys the Straw Hats One After Another!" (or "My Name is Moria!")