Sha Wujing
When Toriyama decided to create "Dragon Ball", he used Chinese author Wu Cheng'en's "Journey to the West" as a prototype for his own series. Yamcha took the role of Sha Wujing. His name is a pun on a form of Cantonese brunch called "yum cha". A prototype for Yamcha was Gojō, the river monster, from Toriyama's one-shot series "Dragon Boy".