That's what I assumed too, but I don't think there's a huge difference between a role playing group that uses a TTRPG to play their roles and one that just kinda adlibs it — the point of the game is usually to play a role that you normally don't play, which is almost by definition a trope/stereotype.
All that to say that I have the same question as you (what is a non-stereotypical role?)
All that to say that I have the same question as you (what is a non-stereotypical role?)