Of the current crop. Mugabe gets a bit less press than Quaddafi, but is intriguing none the less. Of course Mswati III does have that helicopter head going for him, so there is that. Most of these countries follow the same repeating pattern: Bloody coup, followed by a great ethnic purge accompanied by a plundering of the country's meager funds, which is either followed by another bloody coup or exile of said leader to another country willing to take the guy in.
My vote is split between Mugabe because he is so well known and oh so wacky and Quadaffi who is even more infamous and just as huggably wacky.
Peace
Lounatik