According to Shrek, ogres are like onions. They have layers.
But that’s not just true of ogres. Characters in general have layers, and how many layers we get to see is correlated–or rather, should be correlated–with how important the character is in the story.
Let’s dive down through the layers and see what we find.
0 – Background Characters
In a movie, these would be extras, hired cheaply for the day to stand or move around in the background, doing completely predictable things that don’t influence the plot at all, simply in order to make the world seem populated. In a Peter Jackson movie, many of them might be procedurally generated by a computer to perform the same function. They don’t say anything (unless they are a mob chanting in unison); they have no individuality; they are essentially human (or human-adjacent) scenery. In a book, they’re likely to be mentioned briefly with a collective noun, or even implied by a phrase like “the crowded streets”.
1 – Incidental Characters
These are the people who, in a movie, might be credited (if they’re lucky) as “Thug #2” or “Woman in Hat”. They have just enough individuality to mention in one or two sentences in a book, but they don’t have names, lines, or much in the way of plot function except as a brief hindrance or help to the more important characters, if that. Like the background characters, they do things that are predictable, completely in line with their type of character. Thug #2 will loom menacingly, draw a weapon, and get taken out by the hero in a second. Woman in Hat will go to cross the street just when the runaway bus is bearing down and provide a moment of extra tension as the hero snatches her out of danger. Or similar levels of interaction, depending on your genre and story needs.
2 – Speaking Incidental Characters
The movie makers will have to pay these characters union scale, because they have a line or two. They’re still fully predictable, with nothing to them that isn’t from either their character archetype or their role in the plot. Their lines will be unremarkable, conventional, and serve no more purpose than to move things along, giving the main characters a minor bit of information or a brief hindrance to their pursuit of their goals. They probably don’t get a name, just a brief description that assigns them to a type, and they would be interchangeable with any other character of the same type.
3 – Minor Characters
Here we reach the point where a skilled writer can start to shine. Someone like P.G. Wodehouse, Charles Dickens or Roger Zelazny can, sometimes in the space of a sentence or two, give us a minor character who is both a recognizable type and also an individual. You get the sense that they have opinions, a point of view, things that they want and care about; these might or might not have some direct impact on events, but they will drive the character’s behaviour. These aspects of their character are usually still entirely conventional–they’re like Tolkien’s description of the Bagginses at the start of The Hobbit: you can know what their opinion will be on any subject without going to the trouble of asking them. But in the best case, that’s a tribute to the skill of the writer in summoning up a character who is much less like a plot point and more like a person, rather than a reflection of the fact that the writer has just written a stereotype.
This level of characterization, then, is where you can start to tell the skill level of the writer. Some writers won’t show the ability to go any deeper than this; even their main characters won’t have anything to them that isn’t part of their archetype or necessary for the plot, and that makes the characters feel flat and predictable.
I’ve been reading a lot of early Wodehouse lately, and honestly most of his main characters don’t get a whole lot more depth than his minor characters, but his minor characters get more distinctiveness than most other people’s minor characters achieve; they’re instantly memorable. Usually, they have something particular about them, something that individualizes them within their type, whether it’s an oddity of their appearance, a mannerism, a skill, a preoccupation, or even a thematic association. For example, in Sam in the Suburbs (link is to Project Gutenberg, where you can read it for free), Mr Cornelius, the house rental agent, is introduced as follows: “He was a venerable old man with a white beard and bushy eyebrows, and he spoke with something of the intonation of a druid priest chanting at the altar previous to sticking the knife into the human sacrifice.” This druid imagery recurs each time Mr Cornelius appears. It has no relevance to his role in the story, which is to let Sam a house and also be the occasional backgammon partner of Sam’s neighbour and boss, and a secondary witness to some events, but it enriches his character and makes him memorable.
Giving minor characters something, anything, that isn’t directly relevant to the story goes a long way to flesh them out and make them feel like people with their own stories that just don’t happen to be at the centre of this story being told right now. I’m thinking of the medical examiner in the TV show The Mysteries of Laura, or for that matter the medical examiner in Elementary; either one could have just been a functionary, a mouthpiece for forensic information that the main characters needed in order to pursue their investigations, but both were enriched with hints that they had a life outside of work, personal peculiarities that didn’t bear in any way on the plot. It only takes a sentence or two of dialog to establish this kind of thing, and you’ll get a lot of payback from those couple of sentences in your reader’s engagement with the character.
Matthew Mercer of the streaming D&D show Critical Role is a master of the minor character. At one point, one of the player characters, who has a magical necklace that lets her speak to plants, addresses a clump of crabgrass in a location where events have occurred that the party wants to know more about. Apparently out of nowhere, Matt improvises Henry Crabgrass, and in no more than three minutes of interaction (starting here; spoilers for earlier in Campaign 2), creates a beloved fan-favourite character. One of the cast even dressed as Henry for the same year’s Halloween episode, when all the cast members dressed as characters other than the ones they played. Part of the secret is Matt’s voice-acting talent; he creates a distinctive voice for Henry. But he also creates a personality, a being who insists on the importance of consent before touching and who has a sense of wonder about his own awakening consciousness. It’s a masterclass in how to make a minor character interesting and memorable.
4 – Secondary Characters
Secondary characters are not protagonists, but they often show a degree of agency that shapes events, hindering or helping the main characters. The story is not usually narrated from their viewpoint, even if the viewpoint shifts around; but it can be, especially if they do something or experience something important in a scene that the main characters are not present in.
Because they typically play an important role in the resolution of the plot, and because of their clearly defined relationship with the main character–sidekick, foil, minor antagonist, or whatever it may be–a danger with secondary characters is that they will, once again, be nothing more than their archetype plus their plot role. Giving secondary characters their own arc of development, change, or pursuit of what they desire takes comparatively little extra work; it doesn’t require whole chapters, just a paragraph here and there. If you give them a viewpoint moment, you can include some interiority, some reflection on who they are, what they want, what they care about, why they are helping or hindering the main character. You can also do that in dialog, of course.
The skills you develop in creating memorable minor characters are also applicable to secondary characters, but what is a quirk or a fun fact about a minor character should be more than that in a secondary character; it should get a bit of development, even if it’s just two or three extra mentions that add context.
Secondary characters can even have contradictions within themselves, something that minor characters usually can’t sustain. We see enough of the secondary character that we can perceive the underlying unity that lies beneath the apparent contradiction, and believe that Ron Weasley can be both an intensely loyal sidekick and someone who can abandon his friends at a key point in Harry Potter and the Deathly Hallows, or that Sidney Carton in A Tale of Two Cities can be unable to improve himself for his own sake and yet will sacrifice himself for someone else. We see enough of the mechanism, the development and drive, the forces acting on the secondary character that we can tell why they would do two things that, in a minor character, would seem completely incompatible, and that gives us the sense, in turn, that this is a person and not just a cardboard cutout. Because people act in contradictory ways all the time; we see it in others and, if we have any self-insight at all, in ourselves.
That’s not to say that a secondary character can’t be completely consistent. Samwise Gamgee is only ever loyal; that’s his role (which makes it all the more powerful when Frodo, under the influence of the Ring, believes Gollum’s allegations that Sam has his own sinister agenda). Sam’s development is in what he is willing to do because of his loyalty, and what he believes himself capable of doing; from listening under the window of Bag End to fighting orcs and a giant spider and carrying his master through Mordor.
5 – Main Characters
Typically, we see main characters from the inside, at least to a degree; they have a viewpoint, either first or close third person, or (mainly in older books) the omniscient narrator shows us their thoughts, feelings, and motivations. That’s not possible in film, so main characters in movies have to have actions and dialog that clearly conveys who they are and why they do what they do, if the movie is not to break down into incoherence.
A main character wants something. They have opinions and preferences. Not every story will show them acting on those desires, opinions, and preferences in an effective manner that makes a difference to how things turn out (see my post on Genre Through the Lens of Agency), but if we’re to believe in them as if they were real people, we should see them making choices based on the interior forces that drive them, as well as the external events of the plot.
It’s perfectly possible, and in some genres (such as action-adventure) even expected, to write a main character without a lot of interiority. That’s not to say that characters from every genre are not enriched by gaining some interiority, and even some contradictions. I’m often disappointed when I read a book where the main characters have no more depth than a minor character, and less individuality than better authors’ minor characters; they’re barely described, any description is entirely conventional, and nothing about them departs from their basic character template. I sometimes dismiss highly conventional, completely expected books as “made from box mix,” and these characters are not only made from box mix but cut out with cookie cutters. They don’t have enough layers, to return to my original metaphor. They’re completely superficial, unexplored.
Again, in some genres you can get away with this; your readers are not looking for deep characterization. But adding a few layers to your characters is not an especially difficult skill if you’re an observer of human nature, and it can enhance your writing out of proportion to the number of words it requires.
Characters who are restricted to their types are not always flat, and sometimes (for example, in literary fiction or some forms of comedy) their inability to step out of their type, to individualize, exert agency over their circumstances, and go their own way, is part of the point the author is making. It’s a tricky balance to write a type-bound character who isn’t flat and uninteresting, and the usual way to do it is either to go all in on the oddities (the usual comedy approach) or else convey the intensity of the emotion they feel about their situation (the usual literary approach). If the comic writer fails to amuse, or the literary writer fails to engage the reader’s imagination, the result is failure. In other genres, there’s a much greater expectation that the main character will be able to transcend their origins and go beyond their stereotype, though sometimes (the blacksmith’s boy who is the hidden Chosen One in epic fantasy, for example) that is itself a cliché.
My point is that there’s always the opportunity to add another layer to your characters, whether that be making your minor characters memorable as individuals, giving your secondary characters an arc of development and some interiority or contradiction, or sinking a little deeper into the minds and emotions of your main characters and showing them being more than just their archetype.