According to tradition, Achashverosh was not of kingly descent, but rather ascended to the throne as a result of a coup and marriage to his royal wife Vashti. Ruling so many nations didn't add to his character. As an omnipotent potentate, he appears foolish and wishy-washy in the Megilla - often changing his mind, and clearly influenced by his many "advisors." Not a heroic figure, this Achashverosh.