Athena was the goddess of war. She was the daughter of Zeus, but she had no mother. She sprang from Zeus's head, fully grown, with armor, and clothing. She was a fierce and and rutheless warrior, which made her the favorite child of Zeus. She was very wise and good at woman's crafts. She needed to protect her people, the Athens.
Zeus was the god of the beautiful sky, and king of the olympus gods. He overthrew his father Cronus, and his brothers hated him for it.
Hades is best known as the ruler of the dead and underworld. It became his home after he and his brothers drew lots for their share of the world.
Poseidon is the god of the sea. In the disney movie The little mermaid, he is Ariel's father.