Sons of Kronos/Saturn: The most powerful male Olympians:
Zeus/Jupiter: Impulsive, greedy, prone to huge temper-tantrums, entirely motivated by his sex drive (Id).
Poseidon/Neptune: Depending on the mood, could be reasonable or nuts. But in general less impulsive than Zeus and less rigid than Hades. (Ego)
Hades/Pluto: Brooding, morbid, obsessed with rules and laws. (Superego)
Debatable, depending on your source. In some myths Zeus, god of law over men and hospitality, is the mediator between other gods and the enforcer of laws (but not in a rigid/unrealistic manner) (Ego), while Poseidon, as roiling and angry as the sea, causes trouble (Id). It was Zeus, after all, who decreed that the gods should stop interfering in the Trojan War, and who swallowed the Goddess of Prudence. Of course, Classical myth is one huge Continuity Snarl, so this is to be expected.
The grandchildren of Atreus (central characters in The Oresteia):
Elektra: Angry, vengeful and bloodthirsty, her hatred rules her quest for vengeance (Id)
Orestes: Ready for battle, but willing to stop and think first. Unfortunately, this leads him to wimp out at crucial moments, and he must depend on his friends for help. (Ego)
Pylades: Wise, clever AND level-headed, a rarity in Greek myths, who only speaks when it's absolutely necessary, but then, his words are perfect. (Superego)
The great female Olympians:
Aphrodite: Free spirited, sexually open, not shackled down by any duties, reputation, or commitment (Id)
Hera: Occasionally impulsive (regarding her husbands other lovers), yet still complies with her responsibilities as a wife, not as sexually open as Aphrodite but not a virgin. (Ego)
Athena: More concerned about learning, has no interest in marriage or any relationships at all, still a virgin. (Superego)
Gawain: Hot-BloodedBadassAnti-Hero of Arthur's court; will kill, without question or orders, anyone who so much as insults him or his friends. Loves women, partying, and fighting. (Id)
Lancelot: The ultimate knight, Arthur's Right-Hand-Man; ever-questing for glory for God and King, and seeking enlightenment through the Code of Chivalry. (Super Ego)
Arthur: Mediator between all the knights, especially the above two, who are notably good friends despite absolutely hating each other. Has his faults (women, women, women), but in the end you can't ask for a better leader. (Ego)