Torakichi is a cat owned by Oyama, residing in the same neighborhood as the main human and animal characters. He is distinguished by a red tie worn around his neck.

He serves primarily as Spank's rival, engaging in frequent conflicts and competitions driven by their mutual romantic interest in Cat, a female Siamese cat owned by Serino Mihara. Despite this adversarial relationship, Torakichi and Spank occasionally collaborate or show moments of friendship, developing a dynamic of vitriolic best buds. Their interactions often involve comedic mishaps, especially during attempts to impress Cat.

Torakichi exhibits jealousy and competitiveness, particularly concerning Cat's attention. His personality includes a degree of street-smartness, yet he participates in Spank's impulsive schemes, sometimes leading to trouble. Examples include joining Spank in detective work, investigating abandoned villas, or causing household chaos while trying to assist humans.

His background beyond being Oyama's cat is not expanded. He remains a consistent figure within the neighborhood animal social circle, interacting with pets like Baron. In the Italian adaptation, his vocal characterization features a German accent.

Throughout the series, films, and other media, Torakichi remains consistent without substantial development. His role is primarily comedic, acting as a foil to Spank while occasionally offering emotional support, such as comforting Spank during distress. He contributes to lighthearted conflicts and reinforces themes of interspecies relationships through his rivalry and occasional camaraderie with Spank.