My answer to (2). Have a democracy. But by no means give power to one devil in any capacity. If you do, he will kill off all opposition, and enrich himself to the fullest. Minimally, all powers are to be given to at least two devils, with veto power over each other. And perhaps two more devils should monitor all activities of the two in power. Also, the period of their power should be minimal — let’s say six months.
My answer to (2) was not capricious. It was suggested by the ancient Roman Republican practice of having two consuls with veto power over each other, as well as by the ancient Spartan practice of having two kings with veto power over each other. And the idea of having “monitors” was suggested by the existence of lichtors and ephors. We can view the German Gestapo and the Russian Cheka as an extension of this idea of having such “monitors.”