[Today we're reading Ch. 25 How to Cheat If You Can't Hire a Whole Chorus, by Michael Tierno (2002).]
Greek chorus was used to "make moral comments on what is happening by raising questions." A modern chorus could be a secondary character.
I've never really looked at minor characters this way, but it's a good thing to have in your back pocket.
WHAT I’VE LEARNED: If you need to debate the morality of a situation, let your minor character speak up.
[DISCLAIMER: I have not been asked, nor paid, to read or comment on this book.]