Goma
A lost cat owned by Mrs. Koizumi.

Otsuka
An elderly black cat with whom Nakata easily communicates.

Kawamura
A brown cat who was addled after being hit by a bicycle. Though they can communicate, Nakata is unable to understand Kawamura's repetitive and strange sentences.

Mimi
An intelligent Siamese cat. Her name comes from "My name is Mimi" in Puccini's opera La bohème.

Okawa
A tabby cat.

Toro
A black cat that temporarily became an 'abstract concept'.