Story Graph/Plot Development, Protagonist/Antagonist

We started graphing our first short story today, and as I went over the terminology, I asked if anyone could explain what each term meant. One student gave an amazing analogy for plot development, from rising action, to climax, to resolution. I realize a previous teacher very likely taught it this way, and kudos to them for their insight, because it's a great way to help students remember. It was such a great description, I wanted to share. "Rising action is like music that gets louder and louder. Then it reaches its loudest [climax], and then gets quieter [resolution]." I loved it! I truly appreciate when teachers put things in terms kids can understand and recall. On the flip side, some memory tricks can lead to a bit of a misunderstanding later on. We have not yet begun to discuss protagonist and antagonist, and though I fully understand why a teacher might explain it this way to very young children (sometimes I think we are pushing concepts down too far to students who are not yet developmentally ready to understand them), saying that the protagonist is the "good guy" and the antagonist is "the bad guy" will lead to issues later on when there is not good guy or bad guy, or there is a person vs. self internal conflict, or a person vs. nature external conflict. Sometimes students have the good/bad guy idea so firmly in their minds they have difficulty understanding types of conflict other than person vs person. In fact, for many the mere term "conflict" is confusing because they hear it and think "fight" or "disagreement," which simply is not always the case.