They could all be cruel in some capacity. There wasn't a specific "god of cruelty".
Greedy, Moody, Cruel, and Violent
Since the Greek gods were personifications of natural phenomena and based on human nature, all of them had the capacity to be cruel. Some were worse than others, but all of them, at some point, did something we would consider cruel.
Poseidon was the Greek name for the god of the ocean.
he is bloodlust, determined, vicious, cruel, and brave and hunger to kill and make the other greek gods have wars.
roman = Pluto greek =hades Your question makes little sense. The Greek name for the Greek god Hades is Hades. His Roman name is, as mentioned above, Pluto.
The Greek god Ares (Roman name: Mars) was the god of war.
There is no Greek god of books but there is a Greek goddess of wisdom her name is Athena.
Vulcan(us) is the Roman name of the Greek god Hephaestus.
The god of grapes/wine. In Greek it is Dionysus. Bacchus was the Roman name.
Mars was the Roman name for a god they likened to the Greek Ares.
His greek name is Hephaestus.
His greek name was Hephaestus.