Thomas has the ability to project the different aspects of his personality in four different characters. Logic is his logical side, Dad is his moral side, Princey is his creative side, and Anxiety is his fear. When Thomas has some kind of existential problem, or he's had some kind of trouble in his life or simply feels in the mood for sharing something, he summons his Sanders Sides (or the Sanders Sides pop up at their will) so that his conversation with them can help him reach a conclusion or a solution for his dilemmas.