Piccolo Daimao

ピッコロ大魔王

Piccolo Daimao is a character from the Dragon Ball anime and manga series, appearing occasionally in a few Dragon Ball Z flashbacks. He is introduced as a Mazoku who once plunged Earth into total chaos and pandemonium, birthing a brood of animal-like Namekians from within himself and turning a peaceful planet into a living hell. Later, it is revealed that he is the evil half and twin brother of Kami; the two were originally a single entity. Piccolo Daimao's name derives from the musical instrument of the same name—hence, all his sons share names of various musical instruments. While he is named after a flute, the others are named after percussion instruments.
Piccolo Daimao came into existence roughly 300 years before the start of Dragon Ball, sometime after a powerful Namekian on Earth attempted to assume the position of Earth's guardian. He was denied the position due to the evil concealed within him. Consequently, the Namekian concentrated and trained to expel the evil inside; this process resulted in two separate entities—if one perished, the other would too. The concentrated evil became known as Piccolo Daimao. Initially, the name "Piccolo" referred to the wind instrument, but a revelation by Mr. Popo to Bulma indicated it translated to "different world" in Namekian.
It remains unknown whether Piccolo Daimao knew he was a Namekian, as he is shown to know the language, and some of his powers and techniques are of Namekian origin, even replicating Guru's throne. If Piccolo Daimao knew, this could imply that the evil within Kami originated from being a Namekian warrior.