>Stu Pickles
You play as Stu, making toys and being a family man. As you progress, things begin to seem a bit off; your keys mysteriously seem to shift positions on the house when you aren't looking, you clearly remember making and eating a sandwich only to find that you are still holding the loaf of bread. Things like that.
Eventually his psyche begins to feel the stress. You start making pudding at 3 in the morning. All of this leads you down a path of rampant mental destruction and psychadelic wonderment into a crazy fantasy world of his own creation. You battle monsters and aid locals in this amazing world, gaining power and finding weapons/armor to bring down the final boss, Gruntrok, the ogre.
The game ends with a cutscene of a screaming Stu in a Reptar suit being carted away by the authorities and standing over the bloody, bludgeoned-to-death bodies of his brother's family and the little old lady from acoss the street.