Mercury (Hermes/Greek) is the equivalent of the Greek god Hermes. He was seen often as the swift messengers for the gods. Mercury is the son of Jupiter and Maia. He was born in a cave on mount Cylene in Arcadia - giving him often the name of Atlantiades or Cyleenius.
Mercury was also the divine herald, the guide who knew the road to the Underworld after Thanatos did his job. Mercury also held the position of the Greek god of Commerce and Market. His realm also included gymnastics.
Mercury is said to have been the shrewdest and most cunning of all the gods, a master thief who started by stealing Apollo's herds. He has swift feet and can do that kind of thing.
Mars (Ares/Greek) was the Roman of storms, tempests, and most notably: War. He was a son of Jupiter and Juno, born in Thrace. Neither of his parents liked him. He is represented as very hateful through classic works such as the "Iliad." Mars is described by Homer as murderous, bloodstained, and a curse on mortals. Oddly enough, Mars is regarded as a coward who starts a fight and runs away when wounded.
Mars came well escorted in battle. His sister, Eris, nephew, Shrife, Phobos, Metus, Demios, Pallor, and Bellona (goddess of War) would attend him in battles. They sympathized with him.
He became symbolic with storms and turmoil in human relationships and hence to being the god of war. Mars wasn't as widely worshiped as other gods.
Jupiter (Zeus/Greek) is the god of justice and rule of the gods. He is the undisputed leader. He was the source of all nature and heavenly elements - rain, lightening, drought, ect.
He was the sixth child born to Saturn (Cronus). Saturn, ruler of the Titans, was warned by an oracle that he would be over thrown by his children. Fearful of this, he swallowed the first five of his children that his wife bore. Rhea, didn't like this, so when Jupiter was born she substituted him with a rock. She then sent the baby to Gaea (Mother Earth) to raise the child on Crete.
Jupiter then tricked Cronus by the help of his mother into drinking a drink which made him disgorge the swallowed siblings. The children of Cronus then attacked their father and defeated him.
Jupiter (Senshi)is the equivalent with Jupiter, and was known to use lightening to do his biddings. He was the son of Saturn (god of Time).
Venus (Aphrodite/Greek) is the goddess of love, beauty, fertility, and desire. There are two know stories of her birth. One by Homer, in which she was the daughter of Zeus and Dione. Later myths tell that she rose from the sea form on a shell after Cronus tossed Uranus' severed genitals into the ocean. Her greek name comes from the Greek word for 'foam.'
Venus is also married to Vulcan (Hephaestus), the lame god of the forge and metalworking. He was the only god to be physically ugly, but this was an arranged marriage by Zeus. Vulcan did his best to please his beautiful bride, constantly making fine jewelry and furniture to make her happy. You have to feel bad for the guy.
Pluto (Hades/Greek) is Zeus' brother and king of the Underworld. He was often called the god of wealth because of all the metals and treasures buried deep within the earth, which was his kingdom. The name Pluto also derives from a word meaning 'rich' in Latin. He was the only god to spend most of their time away from the Underworld.
Pluto was also one of the more ferocious and formidable god in battle. This went along with his dark and morbid personality - being from the land of the dead. He was not an evil god, just feared by men because his realm was the land of the dead. Pluto, however, was not death himself, That as Thanatos.
Pluto is always shown as a stern, dark man with a key in hand to show that he guards those who enter his domain. (notice, each of these represent Sailor Pluto)
Uranus was the god of Heaven (Sky), the first ruler (followed by Cronus and Jupiter). Gaea, his wife, was the goddess of the Earth. Uranus and Gaea, were the parents of the Titans. His rule ended when Cronus his son, castrated him. He either died from the wound or withdrew from the earth all together.
Neptune (Poseidon/Greek)was the ruler of the sea and often called the 'earth shaker.' After he and his siblings defeated the Titans, he drew the lot of the sea. (Jupiter had the heavens and Pluto, the underworld). Neptune is one of the most powerful gods, second to only Jupiter. So one would be very afraid if they had both Jupiter and Neptune against them.
Neptune had a wife, Amphitrite, the granddaughter of the titan Oceana. He was never satisfied with his share of the world and often conspired to dethrone Jupiter. When this plot was discovered, Jupiter exiled Neptune to earth where he built the walls of Troy.
Cronus was the ruling Titan until Jupiter over threw him. Cronus was given the prophecy that he would be overthrown by his children. Afraid of this, he ate the first five children bore to he and his wife, Rhea. Rhea hid away the sixth child, Jupiter, and tricked Cronus into believing a rock was the child. When Jupiter was older, he had his siblings expelled from the body of Cronus and they over threw the Titans banishing them to the underworld. Cronus, however, managed to escape to Italy and rule as Saturn.