She is an Arrancar and the leader of the Giant Hollow Fortress which attacked Karakura Town. She wears a modified version of the standard white Arrancar uniform resembling a dress. She has pink eyes, long purple, curled hair and wears purple lipstick. Her mask remnants resemble the head of a rabbit complete with ears. When the Karakura-Raizer team defeat some Hollows, she appears along with a giant fortress floating in the sky. She claims that Sōsuke Aizen has given her "great power." After Ururu Tsumugiya defeats all of the Hollows coming from the fortress, Kon, Tatsuki Arisawa, Keigo Asano, and Chizuru Honshō arrive at the fortress. While Tatsuki is not looking, the Unnamed Arrancar attempts to impale her throat. Tatsuki grabs the Arrancar's Zanpakutō and the Arrancar is impressed that Tatsuki was able to dodge her attack.

Bleach
Ichigo Kurosaki is an ordinary high schooler—until his family is attacked by a Hollow, a corrupt spirit that seeks to devour human souls. It is then that he meets a Soul Reaper named Rukia Kuchiki, who gets injured while protecting Ichigo's family from the assailant. To save his family, Ichigo accepts Rukia's offer of taking her powers and becomes a Soul Reaper as a result. However, as Rukia is unable to regain her powers, Ichigo is given the daunting task of hunting down the Hollows that plague their town. However, he is not alone in his fight, as he is later joined by his friends—classmates Orihime Inoue, Yasutora Sado, and Uryuu Ishida—who each have their own unique abilities. As Ichigo and his comrades get used to their new duties and support each other on and off the battlefield, the young Soul Reaper soon learns that the Hollows are not the only real threat to the human world. [Written by MAL Rewrite]