The personality is formed based on inherent tendencies and is affected by our experience and conditioning. It has great potential for transformation. The Chakra model can serve as a map of personality.
Not every student will be open to an intentional dive into their deepest beliefs and analysis of the innermost layers of their personality. Before you begin this kind of work, be sure that your student is interested and open to that exploration. You don’t have to use chakra terminology to have important conversations with your students about their views of the world and their ways of interacting with it. If the student is not willing to do this kind of inner processing, you can use your own assessment of their personality to better tailor your yoga practice to their needs.