The main character of the story. A 15-year-old boy with blond hair and green eyes from the prestigious Vessalius family, whose father is the reigning lord. His mother was killed by the Nightray family, but despite this, he retains a bright, optimistic, and energetic personality. The story of Pandora Hearts starts when Oz turns fifteen. During the ceremony to celebrate this reaching of adulthood, he was dragged into the Abyss for the sin of "existing." There he meets the chain named Alice and makes a contract with her.