Hong Kong and Singapore are both considered developed by many, and they obviously are not majority European descended. Malaysia and South Africa are part of a second tier, neither developed but still developing at a rapid clip. Third tier would be countries such as Uganda and Ghana, poor countries, but relatively stable ones. Also to be taken into consideration is how much of the success is directly traceable to British rule.
Singaporean politics have been dominated by the People's Action Party (PAP) since self-government was attained. Although Singapore's laws are inherited from British and British Indian laws, including many elements of English common law, the PAP has also consistently rejected liberal democratic values as "Western." Laws restricting freedom of speech, including criticising the government, are justified by claims that unrestricted speech may breed disharmony within Singapore's multi-racial, multi-religious society.
Worthington, Ross (2002). Governance in Singapore. Routledge/Curzon. ISBN 0-7007-1474-X.
Neither is Hong-Kong, after the British left. Besides, both are port-city-states, nowhere near comparable to complex nations. Malaysia was run by the Suharto regime, and has seen democracy in probably only the last decade or so, if at all.