There are many famous gods and demons in Greek mythology. Here are some common names: God: 1 Zeus: One of the 12 Olympian gods of the sky, also the god of thunder and storm. 2 Hera: One of the twelve Olympian gods, the goddess of fertility and protection, and also the god of war and conflict. Poseidon: The sea god, one of the twelve gods of Olympus, was also the god of thunder and storm. Apollo: One of the twelve gods of Olympus, the god of music, poetry, and archery. 5 Aristophanes: The God of Wisdom, one of the twelve Olympian gods, was also a philosopher and scientist. 6 Helionius: One of the twelve gods of Olympus, the moon god, and also the goddess of hunting and the moon. Athena: The goddess of war, one of the twelve Olympian gods, and also the goddess of wisdom, strategy, and war. 8 Orpheus: One of the twelve gods of Olympus, the god of music, and the son of the goddess of song and muse. Demon: 1 Mephistopheles: The God of Lies, the God of Temptation and Deception, the Serpent God and the Magician. 2 Ninus: The God of Desire is also a snake god and a mythical figure. 3 Epymne: The god of vipers is also a snake banshee. 4 Selene: The goddess of the sky and stars is also a snake god and a mythical figure. 5 Metis: The god of death and metabolism is also a snake god and a mythical figure. These are just the names of some common gods and demons in Greek mythology. There are many other mysterious characters and creatures in Greek mythology.