Thoughts for improvement:
3 male characters with professions and "a girl"... I don't want to be melodramatic and say that it seems sexist or discriminatory (those are terms that are way overused in my opinion), but you may alienate some of your female fan-base. Maybe make the last character a "model". Or maybe have 2 female professionals and 2 male professionals.
Otherwise, I enjoyed playing the game. A great addition to the Infectonator series!