Goku (孫 悟空, Son Gokū), born Kakarot (カカロット,Kakarotto), is the main protagonist of the Dragon Ball

metaseries created by Akira Toriyama. 

  Goku is a Saiyan originally sent to Earth as an infant with the mission to destroy it.

However, an accident alters his memory, causing him to grow up pure-hearted and later become Earth's greatest defender, as well as the informal leader of the Z Fighters.