Goku

Goku is the main character of Dragonball-Z-GT. He is Bardock's son (Sayian name: Kakarot) who was sent as an infant to destroy Earth. He was found in Mount Paozu by Grandpa Gohan and banged his head on a rock. Having forgotten his Sayian quest, he trained under his god-grandpa. He later trained under Master Roshi, Kami, and King Kai. Goku married Chi-Chi and became the father of Gohan and Goten. Goku sacrificed himself for the defeat of his evil brother (Raditz), was wished back with the dragonballs, sacrificed himself again to save the Earth when Cell exploded. Goku can naturally reach up to the Super Sayian 4 level; considered the true Saiyan who appears every 1000 years. In addition, Goku temporarily fused with Vegeta to become Vegetto and Gogeta. A natural warrior, Goku dedicated his life protecting the planet. At the end of Dragonball GT, Goku rode on the eternal dragon,  Shenlong, fused with the dragonballs, and disappeared.