This sounds like a psychology assignment, and a pretty basic one at that. Do you have a textbook? If so, then I am guessing that your instructor would like you to use the personality theories covered in that text. If the instructor has lectured on the subject, consider the theories covered in those lectures. It's hard for us to suggest which theoretical models or concepts for you to mention without knowing which have been covered in your class. The five-factor model? Psychoanalytic theory? Maslow's research on self-actualizing individuals? What?
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