Ao is Yuri's horse. She was so named because Yuri thought that "a Maou has got to have a horse named Ao". She has jet-black fur. Yuri describes her as "shorter and stouter" than racehorses, but with thicker legs, and the disposition of a warhorse. Her breed has two hearts, and it is said it will still carry its master on its back even if one of its heart stops.
