Goku means aware of emptiness (The 'Go' syllable means enlightenment, and the 'Ku' syllable means Sky or Emptiness). Goku's full name (Son Goku) is the Japanese name for Sun Wukong, main protagonist in the Chinese legend Journey to the West, off of whom Goku is loosely based. Goku himself started off as more or less a parody of Sun Wukong, and as the manga continued its run he was able to develop differently, eventually turning out to have similar origins – http://dragonball.wikia.com/wiki/Goku.

Goku was a low class Saiyan that was sent to destroy Earth. His father, Bardock, was disappointed when his power level was only 2.

When he was sent to Earth, he bumped his head and got a case of amnesia. He was pure hearted from then on. He was adopted by Grandpa Son Gohan, who was his first trainer. He accidentally killed his "grandfather" when he turned into an Oozaru (by looking into the moonlight).

He was found by a young girl named Bulma when she went to search for seven mystic balls called the Dragonballs.

He went looking for the Dragonballs when he and Bulma came across an old pervert called Kame Sennin. Kame Sennin was once the world's strongest man. After a while, Goku went back to Kame Sennin for training. He became super strong and was given an orange gi. He wore this gi almost through Dragon Ball and Dragon Ball Z.

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