Question: is yamcha related to goku?
Answer: He is first introduced as a desert bandit and an antagonist of Son Goku in chapter #7 Yamcha and Pu'ar (ヤムチャとプーアル, Yamucha to Pūaru), published in Weekly Shōnen Jump magazine on September 11, 1984, alongside his constant companion Pu'ar. He is eventually depicted as being reformed, becoming an ally of Goku's.