In Greek mythology, the ruler of the Underworld is Hades, who governs the realm of the dead. Hades is often depicted as a solitary figure providing justice and oversight for departed souls. He is typically not considered evil but embodies the inevitable cycle of life and death. His realm includes various regions such as Elysium for the virtuous and Tartarus for the wicked. While he is a powerful deity, he prefers to remain apart from the living world, reinforcing the understanding that he presides over the finality of human existence rather than actively interfering in mortal affairs.