on Writing Forward:
I was recently reading a novel, and a few chapters in, I realized I had mixed up two of the main characters. In fact, I had been reading them as if they were a single character. I’m a pretty sharp reader, and this has never happened before, so I tried to determine why I’d made the mistake. Was I tired? Hungry? Not paying attention?
I went back and reviewed the text and noticed that these two characters were indistinct. They were so alike that without carefully noting which one was acting in any given scene, it was impossible to differentiate them from each other. They were essentially the same character. Even their names sounded alike.
This got me to thinking about the importance of building a cast of characters who are unique and distinct from each other instead of a cast of stock characters who are mere clones of one another.