In this study, design majors were analysed to examine how diverse personality traits interact and influence student creativity. The study participants comprised 476 design majors. The results indicated that openness predicted the originality of creativity, whereas openness, conscientiousness and agreeableness predicted the usefulness of creativity. Neuroticism moderated the effect of extraversion on the originality of creativity, and this moderating effect particularly benefitted to introverted student designers. Both conscientiousness and openness moderated the effects of agreeableness on the originality of creativity. Compared with the originality of students who exhibited low levels of agreeableness, the originality of agreeable students increased more rapidly in response to conscientiousness, but increased more slowly in response to openness. These results provide insight into the complexities of the personality--creativity structures of design majors and can serve as a reference regarding the project management and creative performance levels of design teams.