Ulquiorra is a slender and rather muscular arrancar of medium height and melancholic appearance. He has unkempt medium-length black hair, pale white skin, and green eyes with a slit pupil like a cat's. Part of his bangs falls between his eyes. Ulquiorra is very cold, soulless, dispassionate, or even standing aside, thoughtful and indifferent. His cold nature allows him to remain completely calm and maintain control over himself in all situations, and he is very difficult to surprise.