Tales of the Three Tanks
This game is set in an empire with a fairly stratified society. There is some class mobility, but it is not very easy or quick.
The nobility serves as the government and owns the land as feudal lords. They are responsible for overseeing the safety and well-being of the gentry and peasants in their lands.
The gentry consists of people with the means of supporting themselves significantly beyond subsistence. They may own significant personal property, but must still rent any land they use.
The peasant class is generally subsistence farmers or other hard labor, depending on the region. Their housing and land is rented from the nobility for a portion of their production. Beyond a few basic tools and clothes, they have little personal property.
Below even the peasantry are criminals and squatters. They receive no protection from the nobility, and are wanted men. They survive by theft and poaching, or die forgotten in the countryside.
There are some groups that exist outside this social structure without being outlaws. This includes druidic orders, a few monasteries, and some travelling gypsy-like bands. They generally have no legal rights in the empire, but are not persecuted as outlaws, either. The exact nature of their relationship with the rest of society depends largely on the regional nobility. Most of these groups are welcomed for their unique contributions, so long as they do nothing to disrupt the status quo. Some of these people become highly respected in their own right, such as powerful druids and ancient monks, and may be consulted by nobility on matters concerning their expertise.