Is 'average' the correct question to ask (I take 'average' to be mean)? It seems to me the commonalities would be what you want to look for. I'd be looking for

Is 'average' the correct question to ask (I take 'average' to be mean)? It seems to me the commonalities would be what you want to look for. I'd be looking for the most common tropes, and then if the story's the goal, build it up from there.