Who is the head of state in a dictatorship?

A "tyrant" --- which is derived from the same root as the Word tyranny. the official title can be all sorts of things from Emperor, Czar, King, Queen, el Presidente, Supreme Ruler, General, or - as in the case of the head of state in North Korea - several titles at once: "Chairman of the Workers' Party of Korea", "Chairman of the Central Military Commission", "Chairman of the National Defence Commission", "Supreme Commander of the Korean People's Army", and presidium member of the "Politburo of the Workers' Party of Korea".