Someone asked me to summarize King Zeal's demeanor, so:
King Zeal, back in the days of Zeal, was an ambitious but measured man. Like Zeal, his philosophy was rooted in humanism. He praised consciousness, sentience, emotions, and all realms of the human experience, and valued highly the pursuit of dreams. This made him a natural fit as King; the entire Kingdom of Zeal was possessed by a great spirit to learn and discover.
Post-death, King Zeal's philosophy has been considerably embittered by the discovery that Zeal fell because of Lavos, and that humanity never produced such a beautiful civilization thereafter. In Zeal, there was Kajar and Enhasa; Kajar hosted those who wished to discover and build in reality, and Enhasa hosted those who preferred to dream and explore those ethereal realms. But in the modern world, King Zeal found people to be dominated by pettiness and consumerist cares, with dreams of more grand material possessions or simple procreation. And worst of all, the highest ambition of Zeal had been demonized in legend as overdoing it.
King Zeal consequently viewed most of the rest of humanity not part of Zeal as inferior. They possessed inferior minds, inferior curiosities, inferior passions, and inferior dreams. This ethically rationalized manipulation of these people and his own arbitration of the timeline to revive the Dream of Zeal, which was in contrast to the modern world's mediocrity. On a personal level, he remained a consummate human, with voracious curiosities in new experiences and a desire to taste all the spice of life that the universe could offer. But post-death, he held a lot of anger towards the world for its mediocrity; for the fall of Zeal; for the wasting of humanity's potential.