The next section of our Storytelling Elements Table is "Who." I think you can probably figure out what this means by yourself, but I'm going to tell you about it anyway.
Like the "What" was the structural part of the story you were writing, the "Who" is who you're writing about. The characters of your story - and not just the Hero. Protagonists, antagonists, support characters, minions, background characters, cameos (if you have them) - all of these fall under the Who category.
For now, we'll only be handling the broadest strokes of protagonist and antagonist characters, but this is probably a section I'll come back to later so I might add more in the way of character types as influenced by other story elements. (Example: IF McGuffin, THEN Guardian.)
It's interesting to note that a lot of these characters we'll be looking at can be either protagonist or antagonist. We'll start with the characters that are, in general, not main characters, then move on to the Hero and Villain specifically.
I look forward to hearing from you about your characters, and the character types you see in other stories. :)