The Master claims that he alone can tend to their affairs, but not-so-secretly, I think, desires that his son assisted him. Impatient to make progress at his never-ending work, for he presides over an endless procession of the dead. Suffice it, then, to say that the Lord Hades takes matters of the Underworld in utmost seriousness. In life, I once served someone who reminded me of him a little, yet even the kingliest of mortals pales in comparison.
He is a god of character, I have to give him that. What else is there to say about the Master? Master not just of the House in which I work, but of the entirety of the domain beneath the earth, the place we all end up after we die.
After Zagreus successfully bribes Cerberus with a Satyr Sack to let him by without violence, Hades realizes that he needs to become personally involved and heads off Zagreus at the snowy grounds on the living side of the Temple's archway, having donned his Helm of Darkness and brought the spear that is the basis for his symbol, Gigaros, to vanquish his son and banish him all the way back to the House. He berates Zagreus upon the prince managing to progress from Tartarus to Asphodel, from Asphodel to Elysium, and finally from Elysium to the Temple of Styx. Additionally, he will sometimes order shades to congregate near Zagreus in order to punish him (time trials). He is resentful of Zagreus' repeated attempts to escape the Underworld and greets his returns with scorn and mockery. Meanwhile, Hades seems to have left much of the caretaking and raising of Zagreus to Nyx. He employed Achilles to teach Zagreus fighting and give him more of a "firm direction in life". He is shown, in the Remembrances that play before some escape attempts, to have been strict and often cruel with Zagreus during his childhood. Hades is stern, serious, and dedicated to his work. He is in charge of maintaining order within the Underworld, determining the placements and punishments of the dead, and hearing the petitions of shades that come before him.
Hades is the god of the Underworld and of the mineral riches of the earth, the lord and master of the House of Hades, and the father of Zagreus. Though, how was your wanton ransacking of my domain? I told you nobody gets out of here, whether alive or dead.