Faust

Like many other Knights of Hanoi, Aso is a ruthless individual who seeks to acquire and destroy the Ignis, even willing to hold hostages or infect duelists with the Deleted virus to do so. He is fiercely loyal to Varis and will carry out Dr. Kogami's ambitions to the very end. Despite holding hostages, Aso shows a degree of sympathy and mercy as seen when he and Kyoko expressed remorse watching the victims suffer during the Hanoi Project and when he released Naoki Shima after he lost. He is also a very methodical and diligent person evidenced by the way he duels and during his discussion with the other Knights following the Tower of Hanoi