'Retroville citizens' are (normally, unnamed) residents of Retroville who often appear in the franchise as supporting, stock, or background characters. Several of the citizens are seen more than once, though most are just seen in one episode.
Retroville citizens are normally just seen in the background of episodes to make the episode seem more real. This is the case with most television series' background characters. However, some of the Retroville citizens (besides main and recurring characters) occasionally act as supporting characters in an episode.
Each Retroville citizen has a different appearance. All have eyes, arms, legs, shoes, shirts and pants.