Your Sim has personality traits that are picked off of a list that looks surprisingly like an IM window. You pick your current traits from the list to help determine your Sims life goals. The list of traits is far from vanilla. You can be a cowardly cleptomaniac, a child hating daredevil, or evil genius. As you can imagine, they have some different aspirations for their lives, and yes evil characters can end up plotting world domination. You needs have been replaced by 'Moodlets', which cover things like hunger, bladder, energy, social, hygiene, and fun. Each of these are pretty obvious.