In the Genealogy Nietzsche warns against those who look for a 'pure fool', a Parsifal, when they want a Super Human. Nietzsche there and then deliberately mentions the VERY FLAWED Cesare Borgia as a much nearer model of the Overman!The Superhuman will be Inhuman at the same time - that is the polarity around which his world revolves. His will to power will be so excessive at times that this 'power will corrupt absolutely' - yes, but then only the Superman can reach those heights and abysses at the same time.He is a piece of nature.When Nietzsche says that Napoleon is both Unmensch and Ubermensch he is saying that he is his idea of the Super Human - 'warts and all'.