Becoming an Emperor bears the responsibility of many.
It could change a person fundamentally, bringing order to the one and insanity to the fool.
Only certain people could become Emperor and those who were guided there by fate despite their inadequacy were the fools—who would have a short reign, before their minds yielded to madness and caused them to either be killed or overthrown.
As for the chosen ones, their essence was also altered—changed.
Reaching the Emperor's position required them to gamble with fate and take extreme risks.
In essence, these chosen ones were gambling men who wanted to achieve more.
But once they reached the Emperor's throne, the throne altered them to become less insane.
A natural progression as there was nothing above the Emperor's throne, nothing.
Nothing above means there is nothing to climb and thus, boredom settles.
Imperial manners, the likes of being composed and stoic were not trained.