This research investigated the impact of four features of teachers behavior viz. teachers support, facilities provision, security in classroom, and motivation of teachers on five aspects namely agreeableness, extraversion, conscientiousness, neuroticism, and openness personality traits of the students. The technique of Stratified random sampling was used for the selection of 1438 students from a population of 10 graders of the Hazara Division. The questionnaires, for teachers behavior and for exploring the Big Five personality of the students, were used for gathering data from the students. For analysis, Mean (M), standard deviation (S. D), and multiple regression analysis were used. Results showed that Teachers support negatively predicts the agreeableness trait of personality, Provision of facilities positively predicts extraversion factor of personality. Classroom security positively predicts the extraversion, conscientiousness, agreeableness, and openness factors of personality. Teachers motivation positively predicts extraversion, and conscientiousness factor of personality and negatively predicts neuroticism factor of personality.