What were the special characteristics of the population of Virginia in the seventeenth century
The most important "special characteristics" of Virginia's population during this time had to do with race, age, and sex.
Those who came to Virginia in the seventeenth century were mainly young, single men. This was true to such an extent that the sex ratio in Virginia in 1650 was six men to every one woman. By the end of the seventeenth century, it was still about three men to every two women. The population was also quite young. This was because most people died early, with half of those born in the Chesapeake colonies dying before they reached 20 years of age (Source for all statistics: The American Pageant 11th edition, page 64.)
Because of the tobacco trade, Virginia also had a large number of slaves. The slave population was still small in 1650, but it grew to the point that slaves made up almost 15% of the population by 1700. So, Virginia's population was younger and more male than other colonies' populations. It also included a significant number of African and African American slaves.