Zeus was one of the first gods, he is know as the god of the skies and thunder or father of gods and men. He was the ruler of the Olympian gods. His weapon was a thunderbolt which he hurled at those who betrayed him or people who lied to him.
Hades was the god of the underworld and ruler of the dead. The Greeks were scared to say anything about him because they thought they would end up dead sooner. He didn't like leaving the underworld. He's weapon was a pitchfork, which he used to cause earthquakes.
Poseidon is the god/ruler of the seas. His weapon was a trident, with which he could make the earth shake, causing earthquakes, and shatter any object. He was second to Zeus in power of the other gods.
Apollo god of music, truth and prophecy, healing, the sun and light, plague, poetry. is often playing a golden lyre. He had a twin sister. most important daily tasks was to harness his four-horse chariot, in order to move the Sun across the sky.
Cronus was the father of Hestia, Demeter, Hera, Hades, Poseidon, and Zeus. Cheiron is also called a son of Cronus. In art he was known as an old man holding harpe, or curved sword.