If I had to design KPI for a Quality Management System Representative, I would start by the end, by the purpose, by the reason for its existence. What does your organization want from the QMS MR? One important outcome should be to get and maintain certification. Another can be quality and timing of information about the QMS performance, and another can be about customer satisfaction, complains and lost customers as a measure of customer promotion in the QMS.
The following material will provide you information about the Management Representative: