Different personal traits could predict not only prejudice, but also practices aimed at the inclusion of vulnerable minorities in higher education. On the basis of this assumption, the study presented here sets out to confirm a predictive model of inclusive practices among university teaching staff, incorporating variables of personality, ideological attitudes, perceived discrimination, and beliefs and attitudes towards diversity, hypothesising the pre-eminence of the predictive route anticipated by John Duckitt's Dual-Process Motivational Model in the perception of disadvantaged groups. The research process involved collecting and analysing data from 613 university teachers at eight Spanish public universities, confirming the hypothetical model by means of structural equations. The study showed that personality, through ideological attitudes and, in turn, such attitudes together with perceived discrimination, had significant effects on the inclusive practices of teachers through the mediation of beliefs and attitudes towards diversity, and that agreeableness and social dominance orientation primarily anticipated beliefs, attitudes, and practices. The conclusions establish the relevance of personal competencies in the profile of teachers when addressing diversity, suggesting professional development in such competencies through reflexive, extensive training, and application in the classroom.