Basically Zeus was the first god. The story was that Kronos was king of the Titans. He feared that he would be overcome by the children he had with Rhea. So he ate the children. But his wife hid her last baby, Zeus, and gave Kronos a rock to eat instead. Later, when Zeus grew up, he tricked Kronos by making him eat a mixture of mustard and wine, so he regurgitated his brothers and sisters. Because they were immortal gods, the children had been living and growing up undigested in Kronos's stomach. There was a big fight, which the gods won. They then sliced Kronos to pieces with his own scythe and scattered what was left of him in Tartarus, the darkest part of the Underworld.
The first greek god was Zeus
The first Greek God was in fact not a God but a "thing". It was Chaos which is in a nutshell Chaos.
The "shepered" god or the first god was Choas.
Khaos (or Chaos) was the first Greek God in the Greek God and Goddess Family Tree. He was the first to emerge out of creation. He is infinite space or a void.
Dionysus, the Greek god of festivals, in the writings of Euripides can be considered the first anti-hero.
The couple Uranos and Gaia.
Thespis is not a Greek god; he is known as the "Father of Greek Tragedy" and was the first actor to perform solo on stage. He is credited with creating the art of acting and is a significant figure in the development of ancient Greek theater.
The youngest god in Greek mythology is typically considered to be Dionysus, the god of wine and revelry. He was born from Zeus and the mortal woman Semele, making him one of the last additions to the Greek pantheon.
In Greek mythology, Eros was the god of love.
I believe it was Homer who first described the metallic (albost robotic) helpers of the god Vulcan (Haephestus, to the Romans) the volcanic god of metallurgy.
He has been a Greek God from birth, being the son of Zeus and a nymph named Leto.
Many believe Pandora was the goddess of curiosity, but she was mortal; the first woman. There is no Greek god or goddess of curiosity.