This is an interesting question, because while the gods and goddesses were generally regarded as omnipotent, there was a definite "fastest" among them, and it was Hermes. Second to him would have been Iris. They were the messengers of the gods, and were expected to be expedient. Hermes was also the god of travelers and thieves, both of which imply a need to be hasty.
None of them. Gods and goddesses have to be immortal in Greek Mythology.
Greek Mythology is a study of Greek Gods and Goddesses'
Gods do not die.
Greek mythology is about the ancient Greek gods. Rome was not an ancient Greek god.
Greek Mythology.
The gods in Greek Mythology were just legends. Such as Atlas the god that held the earth and sky, and Zeus the god of all gods.
The Romans, simply put, took Greek mythology and renamed the gods.
Many Roman gods were direct copies of Greek gods simply renamed; as in Zeus becoming Jupiter, Hades becoming Pluto, etc.
In Greek mythology, nectar and ambrosia are the food and drink of the gods. Which is which seems to be a matter of debate.
If Greek mythology: Hera If Roman mythology: Juno
ZeusPoseidonHadesApolloAres
Poseidon