Ulquiorra cifer

The first adult Arrancar to appear in the story.

A slender man with black hair and white skin, wearing the remnants of a mask with horns on the left side of his head.

The first Arrancar that Ichigo Kurosaki encounters in the story, and one of the Espada.

He embodies the form of death known as "Emptiness," with a personality that lacks emotional fluctuation, always expressionless and calm.

He struggles to comprehend the existence of the "heart," a concept humans often mention.

He is highly trusted by Sosuke Aizen and carries out his orders with precision.

Under Aizen's command, he takes Orihime Inoue to Hueco Mundo, becoming her caretaker, combining surveillance and education.

He possesses the power to overwhelm Bankai Ichigo, who has acquired Hollowfication, without even releasing his Resurrección. Until his defeat by Ichigo's complete Hollowfication, he consistently instilled despair in Ichigo (and the readers) with his strength.

According to the 6th Espada, Grimmjow, he has a habit of creating a hole in the same place on his favored prey as he has on himself.