I used to have a runner, though she never actually got to mature into a running worker. The first child born on my game was one of those white haired girls who liked running. Then my game just froze up and my computer rebooted itself. When I got back my little girl had turned into a boy who did not like running and I haven't gotten a runner since

That's why I try not to make the guys the baby makers, women stop once they get pregnant and you don't have to worry about all the mouths to feed:)!