Age - 15 years ( 10 years in the Abyss). The protagonist of the story. A fifteen-year-old boy with blond hair and emerald green eyes from the Bezarius family, whose father is the reigning lord. His mother was killed by the Nitray family, but despite this, he retains his optimistic and energetic character. The story begins when Ozu turns fifteen. On the same day, while strolling with Gil and his sister, he heard a melody. When he went to the sounds of music, then, together with Gil failed somewhere where they found a clock and an unknown grave. Here Ozu had a vision where he first saw Alice - she tried to kill him. Before the coming of age ceremony, he first meets Break and Sharon, who came to congratulate him from the Rainsworth House. Oz liked her right away, he even asked his uncle if he could marry her. When Oz was a child, he tried to earn praise and recognition from his father. Oz later found out that his father hates him in such a way that he does not allow the child to even touch him. He used to be sure that he was weak, and in order to protect other people, he was even ready to sacrifice himself without fighting. spoiler But after meeting with the young heir Naitreev , by Eliot, he changes his worldview, having realized the real value of human life and realizing that by acting with it he can bring much more benefit than self-sacrifice. From chapter 65, he becomes obsessed with Jack, who begins to show him his true story and events that subsequently led to the Sabrian tragedy. In chapter 70 the fact is revealed that Oz is a real Blood Rabbit, or rather a plush toy in the form of a black rabbit. One toy Lacy left to herself, and gave a copy to Will of the Abyss. After immersing Lacy in the Abyss, the rabbit temporarily fell asleep, but Alice appeared soon and gave the rabbit a name - Oz. Having received a name and being in the Abyss, the rabbit received a personality and became the Black Rabbit. During the Sabrian tragedy, he was a chain of Jack, and also unwittingly took part in the Sabrian tragedy, as he broke the chains enveloping the world by orders of Jack ( and request Will of the Abyss). In chapter 74, he regained control of his body, but was wounded by Gilbert and caught by the Baskervilles. In subsequent chapters, it turns out that before he became a chain, he had his own "I", and as a toy he was attached to Alice. As he said: " Alice was pretty heavy, but I loved her smile." The rabbit also realized that he cherishes Alice more than anyone else. Subsequently, it turns out that his body does not belong to him. This is the body of Jack, whose time began to reverse after the events in Sabri. Jack, remembering himself, met with Loan Bezarius and asked him to exchange his child, who should be born dead, with Oz. Because of this, Zai hated Oz.