The Asian influence is strong with a Chinese, Malay, Indonesian and Indian components. I have a Japanese friend here and I am certain there are representatives of other Asian ethnicities here as we'll. There is a Chinatown, Little India and an Arab Street.
And it works. While the political elite is largely of Chinese descent there are significant contributions across the ethnicities. Why does this multiculturalism work? Since Singapore is a small place; 287 square miles and 5.4 million people there is a rational basis for the need to make sure everyone has the capability to make a contribution. Since the birth rate is relatively low, there is a big emphasis on immigration. For example, foreign students are invited into Singaporean universities with subsidized tuitions if they are willing to spend three years working for a Singapore registered company. With this policy they combine the support for human capital development and that of openness to people's from other countries. Typical of many policy choices here, it is rational, there is an incentive, so they do it.
By the way there are many Caucasian visitors and residents here.