Commoner: Coming from a humble background these are everyday folk, used to hardship and poverty. Generally has a profession and in smaller settlements might work for themselves or a merchant in larger towns and cities.
Squalid. You live in a leaky stable, a mud-floored hut just outside town, or a vermin-infested boarding house in the worst part of town. You have shelter from the elements, but you live in a desperate and violent Environment, in places rife with disease.
Social. A social enemy might be a personal rival, an idealogy, or a cultural trait. Its an enemy tied to interactions with others, they may have trouble fitting in, be a social outcast, not identify with their culture, or be wanted but their own kind.