The project team member also referred to as the customer representative and responsible for defining the customer requirements and product features and for ensuring that the development team delivers an end product with the required features is the

Product Owner (PO)

Explanation:

The Product owner is the one who knows what product features actually the customer is demanding from them. His opinion will have significant impact on the product formation as he will be acting as a customer agent. The product owner is a representative of the customer and helps the development team to develop a product of customer choice.