Humans are by far the most common race, but are the most physically and culturally diverse of all the races. These can be roughly categorised into 4 main sub-races.

Syricians

This is the predominant human sub-race of the western lands. Culturally advanced the Syricians once conquered most of the known world west of the Dragons teeth. These people can put there hand to whatever they wish.
They gain a +1 to an ability score of their choice, and -1 to another (This should be discussed with the DM).

Incars

This sub-race boasts the oldest lineage of the western Humans. Localised mainly to the warm south-western regions, rumors tell of a grand temple-city deep within the Jungle-nation of Incaris where these people originated. It is known that the people of Esparanza can trace their lineage back to Incaris. In order to survive in the hot rainforest of the south-west, these people have developed a hardy constitution, and Dark Olive skin to protect them from the fierce sun.
Incars have resistance to toxins, and gain a bonus to their saving throw vs poison equal to +1 for every 3 points of Constitution.

Jannistock

When humans first travelled through the Frostspire Mountains and into the Northern reaches they found a land rich in ores and precious metals, but also one of year-long winters. The Dwarves native to the mountainous land took these people and showed them how to survive here. After time these people have adapted to better survive the cold, and as such have become fair-haired, pale skinned and much more muscular. All adaptations to increase body heat and make the most of poor light.
Jannistock gain 25% cold resistance.

Men of the East

Many thousands of years ago, there were no humans in the western lands. It is said that man originated in the Unapproachable East. Of course these are but tales, for the Dragon’s Teeth prevent passage from the East to the West and vice versa. Or at least no modern westerner possesses the means to cross. For those that dare to speculate, it is rumored that they have incredibly ordered societies and a distinct sense of self, though nobody truly knows if these men exist.

You must make a special case to play a man of the east
Men of the east gain 30% resistance to charm and sleep spells.