Zeus
Zeus played a dominant role, presiding over the Greek Olympian pantheon. He fathered many of the heroes and was featured in many of their local cults. Though the Homeric "cloud collector" was the god of the sky and thunder like his Near-Eastern counterparts, he was also the supreme cultural artifact; in some senses, he was the embodiment of Greek religious beliefs and the archetypal Greek deity.
Odyssean gods
Poseidon is the Greek god of the sea and the brother of Zeus, Hades, Hera, Hestia and Demeter. Beckoned by the curse of Polyphemus, his cyclops son, he attempts to make Odysseus' journey home much harder than it actually needs to be. He appears to be very spiteful in The Odyssey and actively causes problems for Odysseus on sight. Although he cannot kill Odysseus, as it is his destiny to return home, he makes every effort to make Odysseus suffer.