Psychoanalytic Theory, developed by Sigmund Freud, focuses on the influence of unconscious processes, such as drives, instincts, and conflicts, on personality formation and behavior.

Trait Theory posits that personality consists of relatively stable and enduring characteristics, known as traits, which influence an individual's behavior and thoughts.

Carl Rogers, along with Abraham Maslow, was a prominent figure in Humanistic Psychology, which emphasizes the inherent goodness of humans and their capacity for personal growth and self-actualization.

Behaviorism, primarily associated with B.F. Skinner, emphasizes the role of observable behavior, learning, and environmental factors in shaping personality and behavior.

Social Cognitive Theory, proposed by Albert Bandura, emphasizes the role of social interactions, cognitive processes, and self-efficacy in shaping personality and behavior.

Raymond Cattell developed the Five-Factor Model, also known as the Big Five, which identifies five broad personality traits: Openness to Experience, Conscientiousness, Extraversion, Agreeableness, and Neuroticism.

Biological Theory posits that personality is influenced by biological factors, such as genetics, temperament, and neurophysiology.

Personal Construct Theory, proposed by George Kelly, emphasizes the role of an individual's unique ways of interpreting and organizing experiences in shaping personality.

Jean-Paul Sartre, along with other existentialist philosophers, emphasized the individual's search for meaning and purpose in life, as well as the importance of personal responsibility and freedom.

Cultural Theory posits that personality is shaped by cultural values, norms, and social expectations, and that personality traits vary across different cultures.

Self-Determination Theory, proposed by Edward Deci and Richard Ryan, emphasizes the role of an individual's innate need for competence, relatedness, and autonomy in shaping personality and motivation.

John Bowlby developed Attachment Theory, which emphasizes the importance of early childhood relationships, particularly the attachment between a child and their primary caregiver, in shaping personality and emotional development.

Social Cognitive Theory, proposed by Albert Bandura, emphasizes the role of personal agency, self-efficacy, and observational learning in shaping behavior and personality.

Evolutionary Psychology posits that personality traits are shaped by evolutionary pressures and adaptive traits that have been selected over time to enhance survival and reproductive success.

Walter Mischel proposed Trait Activation Theory, which emphasizes the interaction between personality traits and situational factors in determining behavior. He argued that traits are not fixed but can be activated or inhibited depending on the situation.