Dragon Ball Z onward, characters such as Yamcha and Oolong were extremely important to the early narrative of Dragon Ball. This is probably because of their resemblance to the characters for Zhu Bajie and Sha Wujing from Journey to the West. These two figures originated as celestial beings who fell from glory and became demons, although they both ended up reforming and joining Sanzang and Sun Wukong on their quest.
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