So I think there are the explicit references to power: see Vaarsuvius's quest for ultimate arcane power, Xykon's speeches on power, the debate by combat about how Roy'a intelligence was a form of power, etc.
I do think on a metafictional level there appears to be something foucaldian happening, especially evidenced in the most recent book, where you seem to be examining the power of narrative structure. I don't have a great argument prepared, but I think this would be a decent start for an academic paper analyzing Order of the Stick.