Raku

Raku (楽) aka "Cammy" in the English version, is the spirit of a cat that Yuzu Kurosaki once fed. Raku appears only in the anime.

Trivia
In both anime versions, Raku is named after a camel ("Raku" is japanese for "camel" and "Cammy" is short for camel) because it is the same color as camelhair long johns (Yuzu's "camel-colored underwear" in the English version) all information on Raku came from http://bleach.wikia.com/wiki/Raku