Yes, characteristics vary. I am pretty sure the people evolved depending on circumstances, for instance, the race which went war more often would be much more stronger and quick, however, the extent might be very different, whereas one warrior might use the ability of strength alone another might be skilled at making knifes and would use their quickness and smartness. Therefore, as the human history is more or less the same and for every character you will need another which might be different, so you cannot put two people of the same character together because they don't complete one another, like if they are both really angry and strong they will just end up murdering one another, therefore suggesting that the entire world is more or less the same, a persons capabilities might vary but with practice, these can be sharpered by using the right tools to sharpen them.