Quote - I'm wondering if it would be possible for a single Asian figure to accurately represent the various ethnicities, e.g. Chinese, Japanese, Korean etc.? 

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Which Chinese? Han, Hui, Xibe, Manchu, Zhuang, or one of the other 50+ ethnicities? Assuming a single figure could represent them all is similar to asking if a single figure could represent all Caucasians (including some with epicanthic folds).