Final answer:
The superego is the last to emerge in Freud's psychoanalytic theory of personality, developing as a child learns social rules and forming the moral compass of the individual.
Step-by-step explanation:
According to Sigmund Freud's psychoanalytic theory of personality, there are three aspects of the adult personality: the id, the ego, and the superego. The superego is the aspect that emerges last during an individual's development. It develops as a child interacts with others and learns the social rules for right and wrong, acting as our conscience and moral compass. In contrast, the id is present from birth, driving our most primitive urges based on the pleasure principle, while the ego balances the desires of the id and the expectations of the superego in the context of reality, operating on the reality principle.