Let us dwell right into the "notion of role".
Unlike a drama or cinema, the role at work need not be restricted. The role is something what i believe that i would be doing (aspiration), what i should be doing (expectation), whether it pushes my abilities (performance) and whether i really like what i am doing (passion).
Each one of us can aspire to become something. It doesn't mean that it is available right now. The second thing - the reality might be quite different from belief. I might believe that i am something and ready for something more. The reality could be different and there could be gaps. I might need to work on the gaps, be flexible to play better (efficient, try to solve the team's problem and create impact).
But to start with I feel it is very important to be flexible to contribute more. Flexibility (mindset or paradigm whatever you call it) could be a real game changer. The moment i become flexible, i really tune my antenna of learning and slowly expand my capacity which is very likely to give a career progression and role progression. There is a possibility of becoming a role MODEL.