I thought the whole point of role-playing was the trope of the group you're role-playing as (at least in TTRPG games, where dwarves, or rogues, or warriors, or paladins, etc all usually have a trope that defines their existence)
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?)