Narrative RPGs are arguably all about choices and your power over choices. Choosing a class and a background lays the groundwork for the whole experience of a game and provides a springboard for roleplaying. In the first Mass Effect, for example, you're given two key choices at the beginning of the game that effectively select which version of Commander Shepard you want to inhabit. You decide the personal history and the psychology of Shepard. You decide whether they grew up as the nomadic child of navy officers or on the streets, and whether they matured into a scarred survivor, renowned war hero or a ruthlessly efficient commander.