Goku

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. He is the adoptive grandson of Grandpa Gohan, the husband of Chi-Chi, the father of Gohan and Goten, the grandfather of Pan, the great-great-grandfather of Goku Jr, and great-great-great-grandfather of Gohan Jr and Goten Jr.

Cheerful, courageous and also quite naive, 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. Throughout his life, he trains hard and strives to be the greatest warrior possible, while at the same time using his amazing strength and skills to uphold peace.

Goku now doesn't appear on Earth as much because he has became the guardian of Earth and Z Leader title to Gohan and has decided to only appear on Earth when it is in danger.

Goku returns to Earth in the clone saga to defeat Android 22. Goku realizes that he is facing the most powerful enemy he has ever faced so he gives it up all to Gogeta. Gogeta is no match for the android either. Gogeta is beaten up and faints. Android 22 kidnapps Gogeta and tries to make a clone out of him. The Process fails and instead of one clone two are formed each half the power of Gogeta. Gogeta later wakes up and is defused, so Goku and Vegeta escape the android's lab.