PIONEERS:
These are the base people that first move in when you build a house. They require almost no supplies, and can be taxed very high. They are happy go lucky, though even when taxed high, they do not produce much tax revenue.
SETTLERS:
These are the next to the bottom in the social food chain. They require a chapel to worship.
CITIZENS:
MERCHANTS:
There are more, but I have not seen them yet.