Last I read up on South Africa, the ANC's extremely dominant position means there's pseudo-one-party rule, with all the usual downsides that entails. Politicians are not beholden to the electorate as much as to the party itself, because the party controls who's up for what election.
The US/UK political parties are also pretty nauseating sometimes, but they and the free(r) press are hyper-aggressive at keeping everyone honest (to the point they make mountains out of mole-hills/grains of sand)
Iran, Russia, United Arab Emirates, China, France and the US are country level actors that I know of. I have no doubt there are more. Some of them try to keep the interests of Africa in mind, some are straight up looting (if you make money from a mine but use your profits to improve the area is that looting - this is a complex topic that depends on details)
Many countries are run by a dictator (often their top military general) who run the country for their own gain. Sometimes these dictators are natives who grew up as elite in the country, but none care about the people. Even where the country is a democracy, often the leaders are using corruption to ensure they win elections and then they run the country for their own gain not the people.
Note that I didn't put companies in the list. While there are companies involved, they are all hiding between a country in some way and if you reform the country they are powerless.
The kleptocrats in charge keep pointing at foreigners to distract the population from their corruption and incompetence, and many of the populace, unfortunately, buy into the crap they're fed...they still troop out to vote for the same corrupt thieves in charge.
P.S: I'm Nigerian.
I don't know if they are the best in Africa, but they are near the top. Which is a sad take on how bad the world has looted and still is looting Africa. Who is looting has changed over the years of course, but there are still major players both external and internal looting the countries to their own benefit.