Gokuu Son

Race: ~!Saiyan!~
Height: 175 cm (5'9")
Birth Year: 737 Age
Hobby: Fighting a Strong Opponent

Son Gokuu is a boy we meet in a forest far from any civilization. He lives in this forest alone as his grandpa passed away, he only has this special orb-like object called a Dragon Ball to remember him by, which he will sometimes talk to as if it is his Grandpa Gohan. As the series continues, Gokuu meets Bulma, a brilliant teenage girl, and they go on a journey to collect these 7 magical dragon balls which actually have wish granting powers once all of them are collected. During this journey they meet and befriend Yamcha, Oolong, and Pu'ar, whose characters mirror those found in Wu Cheng'en's Journey to the West. Gokuu also encounters one his closest friends, Kuririn, and others during his time training. Participating in several World Martials Arts Tournaments, ~!Gokuu also battles foes-turned-allies such as Tien Shinhan and Chiaotzu, as well as the offspring of Demon King Piccolo named Piccolo Junior.!~

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Dragon Ball Z takes place 5 years after the defeat of King Piccolo and Gokuu's last world tournament. We come to find out that Son Gokuu was originally named Kakarot, and is born a member of a race of extraterrestrials called the Saiyans. Shortly following his birth, Gokuu was sent from his home, planet Vegeta, to prepare Earth for sale on the intergalactic market by destroying all its life but due to that injury to his head that caused him severe amnesia, Gokuu forgot his purpose, and instead started focusing on becoming stronger for a little more than the pleasure of it. 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, Gokuu 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, Gokuu also gains new friends that help him in these situations.

In Dragon Ball GT, which was not based on Toriyama's manga, Gokuu 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 Gokuu leaving for good with Shenron and returning one hundred years later to witness the match between Gokuu 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 Gokuu's DNA. In Cross Epoch, the Dragon Ball and One Piece crossover one-shot, Gokuu 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)