Mentors' initial perceptions of the mentoring role in formal youth mentoring bonds; and the subsequent characteristics of autonomy support or autonomy control in mentoring interactions developed by mentors after 5 months of mentoring experience are discussed in this paper. The data is drawn from a longitudinal phenomenological study conducted in the Czech mentoring scheme between 2010 and 2017. In‐depth semi‐structured interviews were collected with 10 mentoring matches over 1 year of mentoring involvement. The results of Interpretive phenomenological analysis showed differences in mentors' initial perceptions of the role, and related autonomy‐supportive or autonomy‐controlling characteristics in mentors' approach. The benefits and risks of resulting autonomy support or control in mentoring interactions are discussed. The results argue for the theoretical conceptualisation of a child‐centred perspective in youth mentoring that aims at mentees' support of autonomy, active agency and empowement, thus arguing for further in‐depth exploration of natural mentoring principles in child‐centred perspective, supporting approaches such as youth‐initiated mentoring, and broadening the discussion on good evidence‐based mentoring practice in the EU context.