Prefeito holds elected office as mayor of Tokyo City (called New Townsville in the English dub), managing city administration and safety protocols. Despite his position, he displays a markedly childish demeanor, including a short attention span and tendency to become flustered during crises—especially when monster attacks endanger the city. He openly depends on his assistant, Miss Bellum, for daily operational decisions and effective governance. His personality includes a shared fondness for sweets consistent with others in the series.

His younger brother serves as principal to Momoko, Miyako, and Kaoru's school. Their sibling relationship features frequent arguments and rivalry, often escalating to petty name-calling over minor disagreements. The principal coordinates with Prefeito and Miss Bellum to adjust the girls' academic schedules around their superhero duties, occasionally causing conflict when crime-fighting disrupts school obligations.

Prefeito's core responsibilities involve coordinating city threat responses, including summoning Powerpuff Girls Z via communication devices during monster emergences. He consistently voices concern over battle-related collateral damage, wishing for less destructive solutions. He also handles public relations during emergencies, striving to reassure citizens and maintain order, though his anxious nature frequently undermines these efforts.