The major difference between these two systems is that in a Presidential system, the executive leader, the President, is directly voted upon by the people (Or via a body elected specifically for the purpose of electing the president, and no other purpose), and the executive leader of the Parliamentary system, the Prime Minister, is elected from the ...
The Ubermensch is the opposite of Jesus Christ. The Ubermensch is the ultimate realization of the Will to Power, but no necessarily over others. His most valuable power is over himself. He cannot rule himself will certainty be ruled by others- Nietzsche.
Here's Nietzsche explaining the Ubermensch to Lois Lane: In the twisted world of the Objectvist cult, the world is divided into the Ubermensch--those free of conventional morality--and everyone else, considered parasites living off the genius of the Ubermensch.