Based on all the group shots, the Southern Water Tribe's village (apparently the only one) has a population of twenty two people: nine adults (all women), eleven children (six boys and five girls), and two teenagers (Sokka and Katara, of course). However, one of the six boys is missing when Katara introduces "the entire village" to Aang. There is also a single pet animal (possibly a cross between a dog and a polar bear) present in some shots. See more
Water. Earth. Fire. Air. My grandmother used to tell me stories about the old days, a time of peace, when the Avatar kept balance between the Water Tribes, Earth Kingdom, Fire Nation, and Air Nomads. But that all changed when the Fire Nation attacked. Only the Avatar mastered all four elements. Only he could stop the ruthless Firebenders. But, when the world needed him most, he vanished. A hundred years have passed, and the Fire Nation is nearing victory in the war. Two...