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Birth Year: 737 Age
Hobby: Fighting a Strong Opponent
Favorite Food: All Types of food
Favorite Vehicle: Kintoun (Nimbus)
Originally named Kakarot, Goku is born a member of a race of extraterrestrials called Saiyan. Shortly following his birth, Goku is sent from his home, planet Vegeta, to prepare Earth for sale on the intergalactic market by destroying all its life. Due to an injury to his head that caused him severe amnesia, Goku forgets his purpose, and instead focuses on becoming stronger for little more than the pleasure of it. As the series continues, Goku meets Bulma, a brilliant teenage girl, Yamucha, Oolong, and Pu'ar, whose characters mirror those found in Wu Cheng'en's Journey to the West. He also encounters one his closest friends, Kuririn, and others during his training. Participating in several World Martials Arts Tournaments, Goku also battles foes-turned-allies such as Tien Shinhan and Chiaotzu, as well as the offspring of Demon King Piccolo named Piccolo Junior.
Dragon Ball Z takes place 5 years after the defeat of King Piccolo and Goku's last world tournament. He now has a son named Son Gohan (named after Grandpa Gohan) who is some what of a cry baby but has hidden potential. Throughout the series, Goku faces terribly strong opponents like other powerful Saiyans, Intergalactic Rulers, Androids, and Extraterrestrial Beings that give him fights like no other. Along with new enemies, Goku also gains new friends that help him in these situations.
In Dragon Ball GT, which was not based on Toriyama's manga, Goku is turned into a child by a wish on the dragon balls by Pilaf. The series revolves around him traveling around space to find the Black Star Dragon Balls with the help of his granddaughter, Pan, and Trunks. The series ends with Goku leaving for good with Shenron and returning one hundred years later to witness the match between Goku Jr. and Vegeta Jr.
In Dragon Ball Online (which takes place 216 years after Dragon Ball Z, and unlike Dragon Ball GT, Toriyama had a lot of creative control over the story), a new villain by the name of Miira appears with the goal to obtain Goku's DNA.
In Cross Epoch, the Dragon Ball and One Piece crossover one-shot, Goku is seen accompanying Luffy to attend a party hosted by Shenron from whom key characters from both series had received an invitation.
(Source: Dragon Ball Super Exciting Character Guide)