Dekapoo stands as the primary antagonist in the series, a canine scientist consumed by ambitions of world domination. His singular objective is to obtain the legendary "Bobobobobone," believing its possession will grant him unlimited power and allow him to declare himself World President. Despite lacking concrete knowledge of the artifact's appearance, Dekapoo claims he can identify it solely by its purported smell, described as "glorious, elegant, and wild." His character is defined by persistent scheming and the creation of elaborate inventions designed to thwart the protagonist and secure the bone.

Repetitive comedic conflicts unfold across episodic settings like factories, bridges, and cornfields. These confrontations feature physical comedy and escalating sabotage attempts against the protagonist, often involving public nuisance or rule-breaking that attracts authority figures such as a rule-enforcing Doberman. Though driven by antagonism, Dekapoo occasionally displays unexpected traits, like becoming distracted from his main goal; he once advocated for improved labor conditions for an ant colony through social democratic policies and peaceful protest.

Sporadic moments of character development occur when perilous situations prompt Dekapoo and the protagonist into cooperation or mutual assistance, revealing a complexity beyond pure villainy. However, these moments do not alter his fundamental pursuit of the bone or desire for global control. Dekapoo, distinguished by his magenta-colored fur, persists in his antagonistic role. This persistence forms a core dynamic of the series' episodic structure, with each episode presenting new scenarios for their conflict over the legendary artifact.