Asia is way too broad. Every country is very different here. You run from East Asia (Japan, Korea, China, Taiwan) where each culture is dramatically different, to South East Asia (Phillipines, Laos, Thailand, Malaysia etc) where everything is extremely different again, to South Asia (India, Bangladesh, Pakistan etc) which are different again.
About the only thing I would say is consistent through them is that there are people in every country. There is no common language, no common skin color, no common religion, no common food. Its like trying to come up with a symbol for the western world - you have West Europe, N. Ameirca and Australia, all very different.