I am long overdue painting up some Citizens, having in the past relied on acrylic token stand-ins - (which are great, but aren't painted minis!).
I have also been in danger of losing painting momentum recently, (that may not be apparent to readers, I am just in one of those phases of finding painting 'hard to do' at times), so a quick win was always going to be a good motivator, which is why I decided to start with the Pets.
In-game, Citizens are used for Agendas, and there a variety of scoring conditions which can be selected from. They are nice a simple to use and manage during games, so are well worth a try.