Successful mentoring relationships are essential for novice teachers entering the teaching profession. The success of the mentoring process depends in large part on the diagnostic abilities of the mentor, but there is little research on how mentor teachers view their mentees. In this small-scale study, we explored how 11 mentor teachers describe similarities and differences between their mentee teachers. We found that mentor teachers' descriptions predominantly relate to differences in personal engagement with pupils, identifying as a teacher, perfectionism and self-confidence. Mentors tended to describe these differences in terms of traits and dispositions. We provide suggestions for addressing this issue in mentor preparation and for using findings in mentor training, and we provide a conceptual framework for future studies of mentor teachers' views of their mentees.