King Piccolo Daimao

King Piccolo, originally known as the Demon King is the penultimate villain of the original Dragon Ball series. He was born when Kami separated himself from his evil side in order to become God of Earth. King Piccolo is notable to be the most evil and threatening villain at this point in the series, whose story arc toned down its comedic aspect, and the first villain responsible for the death of many major protagonists.

Pre-Dragon Ball
Kami and King Piccolo were once the same being, the Nameless Namek, but when he wanted to become Guardian of Earth, he had too much evil in his heart, so he expelled that evil, dividing him into two, the good half, Kami, and the bad half, King Piccolo.