As the Espada representing emptiness, he has a largely stoic appearance, rarely even changing his facial expression and is a firm believer in materialism, stating that what his eye cannot see does not exist.
As the Espada representing emptiness, he has a largely stoic appearance and rarely even changes his expression. This lack of feeling explains his inability to comprehend the meaning of "heart" and supports his firm belief that what his eye cannot see does not exist.