The OLYMPIANS - in order of importance/birth:  

Zeus:  
ruler of the gods and Mount Olympus. -god of the sky- symbols: eagle and lightening bolt
  
Hera:
wife of Zeus  (she's also his sister)- goddess of marriage - symbols:  peacock and cow
  
Poseidon:
brother of Zeus - god of the sea - his weapon was a trident, which could shake the earth and shatter any object
  
Hades:
brother of Zeus - god of the underworld

Hestia:
sister of Zeus - goddess of hearth and home

Aphrodite:
born from the sea foam - goddess of love and beauty - wife of Hephaestus - symbols:  myrtle tree, dove, swan and sparrow  

Athena:
daughter of Zeus (sprang from his head, fully clothed in armor) - goddess of wisdom, handicrafts and agriculture - symbols:  olive tree and owl  

Ares:
son of Zeus and Hera - god of war - symbols are the vulture and the dog

Hephaestus:
son of Zeus and Hera - god of forge and fire - husband of Aphrodite
  
Apollo:
son of Zeus and the nymph, Leto -god of light and music - symbols:  laurel tree, crow and dolphin 
  
Artemis:
daughter of Zeus and the nymph, Leto (twin sister of Apollo) - goddess of the moon -symbols:  cyprus tree and deer  

Hermes:
son of Zeus and Maia (one of Atlas' seven daughters) - god of thieves and commerce -fastest god, with his winged sandals... acted as messenger for the gods 

LESSER GODS:
in alphabetical order:  

• Herakles:  
  son of Zeus and the mortal woman Alcemene - strongest of all mortals (and most gods) - became an immortal at the end of his life/ welcomed onto Olympus where he married the goddess Hebe  (one of the lesser goddesses)
    
  
• King Midas:  
  asked the god Dionysus to turn his touch to gold. 
  
  
• Pan:  
  son of the god Hermes -god of goatherds and shepherds  
  

LESSER GODDESSES 
in alphabetical order:  

• Demeter:  
  daughter of Cronus and Rhea (titans) -goddess of corn, grain and the harvest.  
  
  
• Eos:  
  daughter of the titans Theia and Hyperion - goddess of the dawn.  
    
  
• Eris:  
  daughter of Zeus and Hera, sister to Ares.  (all Olympians) - goddess of discord 
    
  
• Hebe:  
  daughter of Zeus and Hera (both Olympians) - goddess of youth - wife of Herakles. (lesser god/hero)
   
  
• Iris:  
  sister of the Harpies - goddess of the rainbow.    
  
  
• Nike:  
  goddess of victory.    
  
  
• Persephone:  
  daughter of Zeus (one of the Olympians) and Demeter (see above) - goddess of Spring. unwilling bride of Hades (one of the Olympians).
  

OTHER:

• The Erinyes:
  Also known as the Furies, punish crime. They pursue wrong doers relentlessly, until death, often driving them to suicide. They are particularly concerned with matricide. There are three Erinye - Tisiphone, Megaera, and Alecto. The Erinyes came from the blood of Uranus when he was castrated.
  
  
• The Fates:
  The Fates have the subtle but, awesome power of deciding a mans destiny. The assign a man to good or evil. There most obvious choice is choosing how long a man lives. There are three Fates. Clotho, the spinner, who spins the thread of life. Lachesis, the measurer, who chooses the lot in life one will have and measures off how long it is to be. Atropos, she who can not be turn, who at death with her shears cuts the tread of life.
  
  The Fates are old and predate the gods. It is not entirely clear how far their power extends. It is possible that they determine the fate of the gods as well. In any case, not even the most powerful is willing to trifle with them.
  
  
• The Graces:
  They are the daughters of Zeus and Eurynome. There are three Graces: Aglaia (Splendor), Euphrosyne (Mirth), and Thalia (Good Cheer). The are known for singing and dancing for the gods.