President Mbeki is an introvert by nature, enjoying nothing more than reading and smoking his favourite cherry tobacco, he occassionally spends a little time practicing amateur photography, he has worked hard to improve his image of a cold, calculating businessmen by joking and laughing with particularly the media and at public gatherings - looking at the Mbeki who stepped out as President in 1999 and the one who will be leaving the Presidency there is a marked improvement
Although, it might not seem like it at first glance, his wife, Zanele Mbeki, is more of the extrovert - taking part in church services and night vigils, and quite often visiting local shopping centers to do grocery shopping ( without bodyguards ) talkign to shoppers and department store workers - on the rare occassion that the first lady speaks to the media - she pulls no punches in lambasting Government and their policies
as far as Mbeki's vision to head up the UN is concerned, I really do not think that is where he wants to be - Mbeki is ambitious/power hungry ( take your pick )and heading the UN would not give him the kind of power he wants