During the character creation process, you will be asked several questions about your past. While they may seem silly or unimportant at the time, as you progress through your personal story, you find your answers becoming more and more relevant. To me, it seems like an RP'ers dream. You can actually craft a back-story which, while not COMPLETELY customizable, can reflect your characters past, their values, and their direction in life, and make it actually have an impact on the game.