Haineko (灰猫) is the manifested spirit of Rangiku Matsumoto's Zanpakutō that is seen during the anime-exclusive Zanpakutō Unknown Tales arc and the Beast Swords arc.
Haineko's spirit takes the form of a werecat with peach skin, turquoise eyes, and maroon chin-length hair. While looking mostly humanoid, she possesses a tail, cat ears and pink fur over her body. The fur on her upper body covers her functions as a rather provocative shirt, not covering her shoulders and mid-section, while the fur on her left leg appears as sort of stocking, and puffy shorts that extend mid-thigh. She also has sharp claws for nails which she can use in the conventional sense of striking at her opponent. She sports a voluptuous figure not unlike Rangiku Matsumoto's; both have curvy bodies and well-endowed breasts.