Goku is the main hero of all of Dragon Ball but here his new aprrentice Galrick is. He found Galrick floating in a barren wasteland where Planet Marainia use to be. He senced great potential took Galrick in and raised him and taught him the ways of a hero and martial arts. He taught Galrick all of his techniques. Including Kamehameha,Instant Transmission,Kaio-ken and Super Dragon Fist.he is the father of geten goten goshin goshen and goshan and gohan.Now as the saver of earth goku is the ture hero of humanity