Ulquiorra Schiffer

— A slender and quite muscular Arrancar of average height and melancholic appearance. He has unkempt, medium-length black hair, pale white skin, a black upper lip, very thick eyebrows, and green eyes with slit pupils, like a cat's. Part of his bangs falls between his eyes. Green lines emanate from the lower part of his eyes, as if he is crying. His facial expression almost never changes; he is always frowning. He wears the usual Arrancar clothing: a white shirt, a black belt, and white hakama. But his shirt is longer and its collar is higher than those of other Arrancars.

Ulquiorra Cifer's Number Revealed
Ulquiorra's number and his location.
Like most Arrancars, he bears outward signs of having once been a Hollow. His Hollow hole is located in his sternum, although it was originally in his throat, as can be seen in the manga and anime. The remnant of his Hollow mask is on his head, forming half of a broken horned helmet. He is the fourth Espada, as confirmed by the tattoo on the left side of his chest.