For the three characters that I see, I have three proposal Urges for their players to consider... or counter-propose.
For Empyrean, I don't see a Motivation, or at least missed it in three re-reads, so I'm not too sure how this one may conflict. Urge (Isidorite): Bring the Coastal Satrapies to rebellion. Explanation: While there's not a motivation, I see a goal and this one dovetail with it. And also provide a problem.
For ExisD, you said something that will chafe later on, so how about (Pyrean) Destroy the Divine Cult of the Hunter's Spear. Explanation: It should bring Empty Sky into contact with several divinities, some laudable, some loathsome, and some even bear those appellations from perspectives other than Hobo-chan's.
And for Zaer, I propose a twist on one of the sample Adorjani Urges. Remake anything that offends your aesthetic sensibilities... or destroy them. Explanation: For some reason, beauty, aesthetics, and the like caught in my mind when thinking of your character. And so with a little change I think it's something that can both be a boon and a spur for becoming the master of your own Urge.