the combination of many traits, including humor, fun, style, cool and a little arrogance (not too much though). The power lies in the combination of all these qualities. Just being confident or being funny usually doesn't work. And you can't fake them either. Women can tell in a fraction of a second if you are naturally confident and funny or you are faking it.
For Chinese guys who want pick up White chicks, unless you really have the potential (fun and high self-esteem) and have a few friends who are good at this, don't even think about it.