E. M. Forster is credited with what two terms we use to discuss character?

I believe that the terms that we use to discuss characters that were coined by E. M. Forster are round and flat characters.

A round character is a realistic one, behaving like a real person that exists outside of the novel. It is a character with many flaws and virtues - neither perfect nor the devil himself. On the other hand, a flat character is the one that doesn't evolve at all or change throughout a novel or other literary work.