While recent years have seen increasing initiatives to engage students as partners in higher education, some students tend to be privileged yet others are excluded based on certain selection standards. This paper situates near-peer mentoring within the 'students as partners' context, and investigates the mentoring experience of 3 student mentors whose self-perceived dispositions seemed 'unfitting' to the 'ideal' mentor standards in research and practices. These three cases presented how mentors' mentoring practices were influenced by their dispositions, and identified a growth pattern in holistic competencies which could in return benefit these student mentors' future development. A conceptual model has been designed to capture the potential relationship between mentoring, mentor dispositions and holistic competency development. Both theoretical and practical implications have been made to increase inclusive participation and to provide equitable learning opportunities for more students in higher education.