1] Maybe Hashem's name isn't mentioned in the megilla because Achashveirosh felt that he supplanted Hashem ח"ו. The medrash says that whenever it says מלך it is a veiled reference to Hashem. Meaning, the pshat is Achashveirosh but the remez is to Hashem - because he was trying to take His place... But in the end we see who is in charge....
2] Achashveirosh is this super-powerful king who rules over 127 countries. Yet, he can't even control his OWN WIFE. He also doesn't make a move without consulting his advisors.
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