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In KH: ITHOTCR, Imperius seems to be wrathful and impatient while he talks to Aced and Ira in conversation to Keyblade War.
It is implied that Imperius fights thousands of Heartless, Unversed in War of the Celestial Realm.
He may be the strictest of the Angels. He orders the Angels to fight Heartless. He orders Fulmen and his Keyblade Warriors to deal with Heartless.