Aquila (Japanese イザヤール [Izayaarl]) is a character in Dragon Quest IX. He is the hero's mentor at the beginning of the game. He plays a pivotal role in the overall plot of the story. Aquila is the apprentice of Corvus.
After the game and after Quest 163 "When A Star Wishes Upon You", he becomes avaliable as a party member.
After the Hero returns to the Observatory for the first time, Apus Major tells the hero that Aquila came down with the other Celestrians to found the fyggs and the hero. Aquila's whereabouts are still unknown until he appears along with Barbarus to attack the Starflight Express. He takes the seven Fyggs which the hero has been collecting and causes tosses the hero out of the train. However, Aquila then takes the fyggs to Apus Major himself.
Later, Aquila appears before King Godwyn and reveals that he has been working undercover against the Gittish Empire. King Godwyn then kills Aquila, prior to engaging in battle with the hero.