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Description: Ulquiorra Cifer (ウルキオラ・シファー, Urukiora Shifā) is the Cuatro (4th) Espada in Aizen's army of...
Ulquiorra is a slender, yet fairly muscular, male Arrancar of average height with a melancholic appearance. He has fairly short, messy black hair, pale white skin, a black upper lip, and green eyes with small slit-shaped pupils, similar to a cat's. Part of his bangs fall between his eyes, and he has distinctively thick eyebrows. He has teal lines which descend from the lower part of his eyes. His facial expression rarely changes, though he is almost always frowning. He wears typical Arrancar clothes: a white jacket, black sash, and a white hakama. However, his jacket has longer coattails than others, and the collar is higher.
Like most other Arrancar, he possesses remnants of his former life as a Hollow in his appearance. His Hollow hole is located on his sternum.  though the hole was initially located on the base of his throat. The remainder of his Hollow mask lies on the top-left side of his head, forming a broken horned helmet. His Espada tattoo lies on the left side of his chest. 
As a Hollow, Ulquiorra was roughly the same size, with a full white mask and body, and large black wings mounted on his lower back. His mask covered his entire face, with a line, running up the middle, diverging into three near the top of his head. From ear level, two horns sprouted out. 
Ulquiorra is a very cold, callous, and dispassionate figure, and is rather aloof, brooding, and indifferent, willing to harm both his comrades and enemies should they get in his way. He refers to anyone he does not find interesting as "trash", and treats them as expendable. Despite this, like most of the other top Espada, he is not particularly violent, and will only fight when provoked or ordered to by Aizen.
As stated by Grimmjow. Ulquiorra demonstrates a strange habit when killing victims he is particularly interested in; he stabs them with his bare hand in the same location as his Hollow hole.  Whether he is consciously aware of this habit or not is unknown. During a speech to Orihime. he claims he does not believe in Human emotions, which he refers to as the "heart," reasoning that if his eye cannot see them, they do not exist. These words, and much of Ulquiorra's overall behavior, reflect the concepts of materialism. which connects to his aspect of death as an Espada, Emptiness. In the last seconds of his life, he seems to finally find his own "heart", and understands feelings.
His cold demeanor allows him to stay completely calm and in control in most situations, and he is not easily surprised or caught off-guard. However, he does not seem to comprehend the Human trait of fighting against all odds or the concept of the Human heart; during his final battle with Ichigo, he completely overwhelms the Shinigami after releasing his Zanpakutō, yet Ichigo continues to fight on regardless of this. Because of this, he, shouting at Ichigo out of frustration, tells him "to continue fighting is pointless." He transforms into his Segunda Etapa form in an attempt to show Ichigo "true despair". He seems to contradict himself, telling Ichigo that although it is natural for Humans to mimic Hollows to become stronger, they will never be the equal of Hollows, though the Arrancar are doing much of the same by mimicking Shinigami. 
Ulquiorra is highly perceptive, cunning, and analytical. During his and Yammy's first visit to the Human World, he makes several surprisingly accurate comments on the Humans who confronted them. He theorizes Orihime Inoue 's healing power is a temporal-spatial ability. which Aizen later describes as the rejection of fate, and comments on how Ichigo Kurosaki 's Bankai can easily cut through Yammy's defenses. He notes how Ichigo's power fluctuates, varying between very weak and stronger than his own.
Ulquiorra is very demanding, coming to Orihime's chamber and ordering her to eat a meal an Arrancar servant brought in, claiming that, for Aizen's benefit, it was her "duty" to stay alive. When Orihime hesitates, he threatens to force the food down her throat or strap her to a table and feed her via an IV. This implies that, while he prefers not to dirty his hands, Ulquiorra is fully capable of committing truly abhorrent and inhumane actions without feeling any shred of remorse or hesitation.
After Ichigo's Hollow form overwhelms and strikes him down during his last battle, Ulquiorra, maintaining his composure, calmly berates himself for being defeated by a "Human-turned-Hollow." Believing he no longer has a purpose in life since he was quickly defeated by his opponent, he, demanding Ichigo kill him, compliments Ichigo when he decides to use a point-blank Cero to kill him, claiming the lack of mercy is "rather Hollow-like." This is a marked departure from most of his fellow Arrancar, who died cursing their enemies or with an abject fear of death.
As a Hollow, Ulquiorra felt alone in the world, being white while those around him were black. He wandered Hueco Mundo alone, lamenting his existence, until one day he came across a white tree with many sharp spines. Ulquiorra, finding it satisfying due to its emptiness, sank into it, destroying part of his mask, finally at peace. An unspecified amount of time later, he was recruited by Aizen into the Espada.