Oars is a supreme giant-zombie. He was repaired and animated by the powers of Gecko Moria with the shadow of Monkey D. Luffy.
One of the most massive and powerful beings in the whole One Piece universe, the reanimated body of the legendary Oars has been brought to life when the powerful Gecko Moria infused Monkey D. Luffy's stolen shadow with it. The Straw Hat Pirates may have suffered through many tough challenges and came out on top prior to the events at Thriller Bark, but their war with both Oars and his master Moria will push them to the absolute brink of destruction and dispair.
Oars was originally created by Eiichiro Oda for use in the One Piece manga series. Oars first appeared in One Piece: Volume 47 and in One Piece: Episode 350.