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Piccolo (ピッコロ, Pikkoro?) is a fictional character from the Dragon Ball manga, authored by Akira Toriyama. Piccolo was first introduced as the reincarnation of the evil Piccolo Daimao, making him a demon and archrival of the primary protagonist named Son Goku. However, it is later revealed that he is from the race of alien beings called Namekians. Piccolo is usually referred to as male, but as he is Namekian he is technically genderless. After Goku barely defeats Piccolo, Piccolo decides to team up with Goku and his friends in order to beat newer, more dangerous threats. He also trains Goku's first child Son Gohan, and they form a bond so strong that Piccolo sacrifices himself to save Gohan's life. But Piccolo is later resurrected by the Dragon Balls and permanently joins Goku and the others in their battles against other, even more powerful villains.

The character's name comes from the musical instrument piccolo. Around the start of the Frieza Saga, it's revealed that Piccolo's name means "another world" in Namekian.

James Marsters will play Piccolo in the upcoming 2009 live-action film, Dragonball.

Source: Wikipedia