Vladimir Putin, Russia
Since rising to power, he has never left office. He became prime minister then president as his term expired and now he is back as prime minister. He is also said to be the richest man in the world, amassing wealth from business dealings using his power as leverage. His administration has been linked to corruption. He has also amended the constitution to allow him to serve six terms. The worst part is that he is known not just for corruption, but also for killing opponents and sabotaging democracy in other countries.
