- Lord of the Underworld. Combined with Plutus (Pluto) lord of wealth. Although there is another god who is official god of death, sometimes Hades is considered to be Death.
- (Kore) Wife of Hades and queen of the Underworld.
- A mysterious nature goddess associated with sorcery and witchcraft, who went with Demeter to the Underworld to fetch Persephone, but then stayed to assist Persephone.
- (Furies) The Erinyes are goddesses of vengeance who pursue their victims even after death. Euripides lists 3. These are Allecto, Tisiphone, and Megaera.
- The son of Erebus (also a region of the Underworld in which both the Elysian Fields and the Plain of Asphodel are found) and the Styx, Charon is the ferryman of the dead who takes an obol from the mouth of each dead person for each soul he ferries over to the Underworld.
Parents: Erebus and Nyx
Also note the Etruscan god Charun
- 'Death' [Latin: Mors]. A son of Night, Thanatos is the brother of Sleep (Somnus or Hypnos) who along with the gods of dreams seem to inhabit the Underworld.
Parents: Erebus (and Nyx)
- A conductor of dreams and a chthonian god, Hermes Psychopompous herds the dead towards the Underworld. He is shown in art conveying the dead to Charon.
Parents: Zeus (and Maia) or Dionysus and Aphrodite
- Judges - Rhadamanthus, Minos, and Aeacus.
Rhadamanthus and Minos were brothers. Both Rhadamanthus and Aeacus were renowned for their justice. Minos gave laws to Crete. They were rewarded for their endeavors with the position of judge in the Underworld. Aeacus holds the keys to Hades.
Parents: Aeacus: Zeus and Aegina; Rhadamanthus and Minos: Zeus and Europa
- Styx lives at the entrance to Hades. Styx is also the river that flows around the Underworld. Her name is taken only for the most solemn oaths.
Parents: Oceanus (and Tethys) or Erebus and Nyx
- I hesitate to include him because he is, after all, a dog, and not a humanoid creature of the Underworld, but his parentage is similar to others listed here. Cerberus was the serpent-tailed 3- or 50-headed hell-hound Hercules was told to bring up to the land of the living as part of his labors. The task of Cerberus was to guard the gates of Hades' realm to make sure no ghosts escaped.
Parents: Typhon and Echidna