|Birthday||September 15 (Age unknown)|
"'The Morning Star...also known as Lucifer. The star that was originally an angel, but chose to become the Devil."
- Akio Ohtori
Akio Ohtori is Anthy's older brother, Kanae Otori's fiance the acting chairman of the academy, and the closest character to a main antagonist the series has. Although barely present in the first season of the show, he later plays a pivotal role in the second and third seasons.
In his youth, Akio and Dios were apparently one and the same, but he became corrupted and lost his purpose as a "prince". Given the origin of his name and his role in the story, Akio may be compared to a fallen angel. In the manga, Anthy split the two intentionally; in the anime his fall is more vague; it appears to be catalyzed by Anthy, but likewise also by his own loss of faith in the world which tortures both him and his sister. In order to regain the power he lost when he lost his nobility, he creates the Dueling Game in order to create a Duelist with a sword noble and powerful enough to break the Rose Gate sealing his lost power. In the movie, "Dios" is merely an illusion created by Anthy to hide her brother's flaws so she can have a hero to believe in.
In the anime, Akio uses Utena's familiarity with his "better half" to his advantage and becomes her lover, in order to test whether or not her nobility is strong enough to choose saving her friend over being with her supposed-Prince.
Akio appears to dominate his sister Anthy both personally and sexually; their incestuous and power-driven relationship is key to Anthy's behavior in both the anime (where Anthy is, or pretends to be, held in thrall to her brother) and the movie (where events cause the balance of power to shift dramatically). However, the power is not completely held by Akio, as he is dependent upon Anthy for various reasons. In the anime, Akio appears to show genuine love for Anthy, and even feels her pain, but he is driven by his selfishness and very nature to continue his role in the duels. He grieves over his lost role of the Prince, but —as Anthy herself points out— he chose the path he walked down.
Akio is also a remarkable playboy with many and varied conquests. The list includes Utena, Kozue, and even Kanae's mother. Akio's trademark symbol is his jazzy automobile, in which he invites friends, Duelists, and potential sexual partners to take a midnight ride. Creator Ikuhara has stated Akio's general appearance and presentations, as well as his car, are meant to represent the adult world and adult power.
His given name, Akio, literally translates as "Beginning / Ending of Life". At one point, he makes a pun on his name that derives from ake no myoujou ("The Shining Star of the Morning"), the Japanese name for Venus, which is identified with Lucifer. His last name, Ōtori, refers to the Feng-Huang, or Chinese Phoenix, which symbolizes the dual balance of the Yang (male) and Yin (female) energies of the Tao and embodies the Five Virtues of Chinese medicine. The European Phoenix is a creature that is born in the morning and dies at night to be reborn at the next dawn.
His identity of Prince Dios refers to Dios, a Greek word meaning "Divine" or "God-like".