Olympians

Zeus
Once the King of the Gods, Zeus was killed by Hecate. On the whole, Zeus ruled more justly than Uranus and Cronus, though he is still an authoritarian god with some tyrannical tendencies. He has been a little more democratic than his forefathers, creating a council of gods that act as his advisors. Zeus has generally brought more civilization and stability to the multiverse than previous gods, but this was not his initial intention.
At first, Zeus felt that mortal men should be kept low and subservient to the gods, but he was tricked by Prometheus into granting them certain rights. His position softened as he matured, seeing the benefit of a multiverse in which mortals could flourish. Thus, Zeus has shown a capacity for growth, something both his father and grandfather lacked.

Hades
Hades was killed by Hecate. Hades was building power in his time as ruler of the Underworld. He has connections to more Primordials than any of the Olympians. Several of them live within his realm and he had learned how to call upon their power. His relations with Zeus having never really recovered from the "Persephone incident", having been poor since they drew lots. Hades had been quietly and carefully preparing himself in the event that the two mighty gods enter into open warfare - plans that his death cut short.