What struck me is that this would be very bad for me, because my four-person family has got one of each. I'm choleric, my daughter is sanguine, H is phlegmatic, and my son is melancholic. Were we born this way, or have we moved to occupy those positions to complement each other? No idea.
Also - god, the last place I'd like to be is stuck in a zone with a load of other choleric types. Bad tempered old gits.