Ok, so, these descriptions are pretty much true--but then again, they come from a bunch of books written by some humans, so how accurate can they be? I mean, look at what those humans said about Hades in the Encyclopedia Mythica: "pitiless and inexorable!" Hey, pitiless, fine, but...inexorable? That's not a word! They made that up! Um...right?

Aethon
One of the four horses which pull Helios' chariot.
Atropos
Known as Atropos the Inflexible. One of the three Moirae.
Ascalaphus
The son of Orphne and Acheron. Ascalaphus was able to tell Hades that Persephone had eaten six pomegranate seeds, thus allowing Hades to keep Persephone prisoner in the Underworld for six months out of the year. Demeter turned him into an owl for his tattling.
Cerberus
The giant three-headed dog which guards the entrance to the Underworld.
Charon
The Ferryman for the vessel which traverses the River Styx, in the Underworld.
Clotho
Known as Clotho the Spinner. One of the three Moirae.
Clymene
A Neried. (Sources vague as there were about ten different Clymenes).
Cyane
A Nereid. Cyane witnessed the abduction of her friend Persephone by Hades, and when she cried out, Hades flung his sceptre at her, turning her into a fountain.
Demeter
One of the twelve Olympians. Goddess of agriculture and fertile soil. Mother of Plutus by Iasion and Persephone by Zeus. When her daughter Persephone was kidnapped by Hades, Demeter threatened to strip the Earth of its fertility forever unless she was returned. Zeus sent Hermes to fetch Persephone, but she had eaten while in the Underworld which gave Hades rightful claim to her.
Eos
One of the four horses which pull Helios' chariot.
Fates
The three Moirae, sisters who supervise the creation, duration, and termination of all mortals' lives. They are Clotho, Lachesis, and Atropos.
Hades
One of the twelve Olympians. Ruler of the Underworld. Husband of Persephone.
Helios
Helios is the God of the Sun--that is, he is the sun--or more precisely, he guides the sun, in the form of a chariot, across the sky every day. The chariot is pulled by a team of wild horses manageable only by Helios himself. The horses are Aethon, Eos, Phlegon, and Pyrois.
Henna
A town in Sicily. It was from Henna's beautiful plain that Persephone was abducted by Hades.
Hera
Hera is the Goddess of Marriage and Birth, and the wife of Zeus. She is very proud, and jealous of Zeus's numerous affairs.
Iris
Iris is the Goddess of the Rainbow and the messanger between the gods and mortals. She most often relays messages for Hera.
Lachesis
Known as Lachesis the Disposer. One of the three Moirae.
Moirae
Also known as Fates, or "Those Who See."
Nereids
Nymphs. The fifty daughters of Nereus and Doris. Attendants of Poseidon.
Orphne
A Nereid. Also known as Gorgyra. Mother of Ascalaphus.
Panic
Son of Ares. Brother of Eris (Discord), Trembling, Phobos (Alarm), Metus (Fear), Demios (Dread), and Pallor.
Persephone
The daughter of Zeus and Demeter. Wife of Hades. When Hades asked Zeus to allow him to wed Persephone, Zeus agreed. Hades kidnapped her and took her to the Underworld. Demeter demanded that she be released, so Zeus sent Hermes to bring her home. However, she had eaten while in the Underworld, which gave Hades rightful claim to her.
Phlegon
One of the four horses which pull Helios' chariot.
Poseidon
One of the twelve Olympians. God of the sea. Husband of Amphritite. Had many children by many women. Was often unsuccessful in competitions with other gods and goddesses.
Pyrois
One of the four horses which pull Helios' chariot.
Rhadamanthys
Son of Zeus and Europa. Upon his death, Zeus appointed him one of the three judges of the dead.
River of Souls
The River Styx.
River Styx
A 'river' made up of all the mortal souls in the Underworld.
Underworld
Hades' realm. Land of the dead.
Zeus
One of the twelve Olympians. Husband of Hera. The supreme ruler of the Greek Pantheon. Had many children by many women.

Sources:
1) Dictionary of Classical Mythology, Zimmerman, J.E.--Bantam Books, ©1964 J.E. Zimmerman
2) Who's Who Classical Mythology, Grant, Michael; Hazel, John--Oxford University Press, ©1973 Michael Grant Publications and John Hazel
3) The Encyclopedia Mythica

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