Let's look at some minor story characters - Tertiary Characters, Symbolic Characters, and Prop People.
The term given for the Third Ranking Character in a story is Tertiary. Writers often lump all "other characters" in a story into the tertiary category. However, I like to simplify things and so I split that category into those who are—
Named Minor Characters
Prop People (who are not given a name)
Characters that have a name are important enough to the story that they must be given a name, but not a Point of View-Viewpoint. Often those named characters are familiar with either the Protagonist or the Antagonist, like being part of either's entourage.
On occasions, one of those named characters might be considered a Symbolic Character. A Symbolic Character is any major or minor character whose very existence represents some major idea or aspect of society. For example, in Lord of the Flies, Piggy is a symbol of both the rationality and physical weakness of modern civilization.
Now as to—
PROP PEOPLE OR PROP CHARACTERS
Like the furniture that decorates a setting, these necessary story folks are a kind of stage dressing. They bring realism to the setting and world of the Protagonist and Antagonist. Examples are the bar tender at the Protagonist's favorite watering hole, the taxi or Uber driver, the blacksmith, the farmer's wife, the brewmaster, the crewman who mans a communications or work station, a landscaping crew or other crews including ones led by the Protagonist's or Antagonist's second in command, and so forth. Although such characters may appear regularly in the story, the reader doesn't get to know them, their life story, or even their POV-Viewpoint about what's going on in the story.
However, things will become confusing to a reader if there are too many characters with names, especially among the minor characters. To avoid confusion, most writers set up a Master Word List or what's also called a Style Sheet. This form (*see note below) can be used before (or during) drafting to keep track of names. It doesn't matter if it's a short story, a novel, or a saga, on that Master Word List go ALL NAMES— character, place, and named animals as well as named weapons, streets, or special props (like Ethan Allen or other designer furniture). Doing so uncovers repetition of names and repeated spellings of either whole or partial names. For instance a character called Beth and one called Elizabeth. Word Lists can also bring to light Freudian slips, faux pas, kazoo-sounds, or the rhyme or rhythm of consonants, vowels, and syllables (which isn't good).
A Word List can also reveal if too many characters or names are being created. Again, the reader will get confused if there are too many names to keep track of. So, here's a word to the wise— instead of creating another character who has a minor role, ask yourself if one of the other minor characters can do the same job or get or reveal the needed information.
If you've never done a word list, I have added a free PDF of the three most commonly used types of word lists (style sheets) at my Writers Cheat Sheet. The direct link to the page is HERE
RE: * FORMS —
The Internet abounds with countless forms for writers to use for developing a story. Trouble is, forms do you no good unless they work for you and the way you tell a story. So, consider looking at and reviewing lots of forms, then create your own unique ones which allow you to discover the personalities, tags, and traits of your main characters. You can also develop forms or worksheets that help define your story's plot.
Next Month — September - Naming Characters