Advice for writers
for writers
Types of Subplots: A Guide to Choosing the Right Secondary Storyline
Six Useful Subplot Patterns and What Each One Does
There is no single official list of types of subplots. Craft books and editors group secondary storylines in different ways, and one subplot can easily serve several functions at once. Still, a practical set of categories can help you diagnose what your novel needs.
Instead of asking which subplot type is correct for your genre, ask what the main story is missing. Does the protagonist need more personal stakes? A contrasting example? More external pressure? A second angle on the theme? The function matters more than the label.
Types of Subplots: An Overview
Six useful subplot patterns are romantic, mirror, contrasting, complicating, antagonist, and thematic subplots. These are not rigid or mutually exclusive categories: a single secondary storyline can be romantic and thematic, or complicating and antagonist-driven. Use the labels as a revision tool for identifying what a subplot contributes to the larger story.
A Function-First Subplot Selector
| If Your Main Story Needs… | Consider… | Because It Can… |
| More personal stakes | Romantic or relationship subplot | Make the cost of the main goal intimate and specific. |
| A clearer character choice | Mirror or contrasting subplot | Show another version of the same dilemma or another possible path. |
| More pressure or complication | Complicating subplot | Create consequences from a secondary character’s independent agenda. |
| A more active opposing force | Antagonist subplot | Let opposition develop beyond reactions to the protagonist. |
| More thematic depth | Thematic subplot | Explore the central question through another person or situation. |
You should not add a subplot every time a draft has a weakness. Sometimes the main plot itself needs more work. But when a secondary storyline is the right tool, choosing it by function keeps it from becoming decorative.
1. Romantic Subplots: Raising Personal Stakes
A romantic subplot follows a relationship whose development affects the protagonist’s larger story. The relationship may create something to lose, divide loyalties, change a risk calculation, expose a vulnerability, or force a choice the main plot alone would not create.
The strongest romantic subplot creates a new pressure system:
A spy falls for someone whose safety depends on the spy walking away from the mission…
A doctor begins a relationship with the journalist investigating her hospital…
A royal heir falls for the person whose family would lose power if she takes the throne…
Diagnostic question: If the relationship develops, what main-plot decision becomes harder or newly possible? If the answer is “none,” the romance may be pleasant but structurally separate.
2. Mirror Subplots: Reflecting the Main Conflict
A mirror subplot echoes part of the protagonist’s conflict through another character or smaller situation. The point is not necessarily to teach the protagonist a lesson directly. The parallel gives readers another version of the same pressure, often making the protagonist’s choices easier to see.
Imagine a protagonist who refuses to leave a dying hometown because loyalty has become part of her identity. Her father, meanwhile, is fighting to keep a failing family shop open. The shop storyline can mirror the protagonist’s larger conflict: both characters are asking when persistence becomes self-erasure.
Diagnostic question: What aspect of the protagonist’s struggle becomes clearer because readers see it elsewhere?
3. Contrasting Subplots: Showing the Road Not Taken
A contrasting subplot is closely related to a mirror subplot, but the emphasis is divergence. Two characters face comparable pressures and choose differently. The secondary thread becomes a foil, showing what another path costs or makes possible.
If the protagonist compromises her values to stay employed, a coworker who quits may embody one alternative. If the protagonist isolates herself after grief, a sibling who rushes into a new relationship may represent another kind of avoidance. Neither secondary character exists simply to be “right.” The contrast should complicate the main choice, not reduce it to a moral lesson.
Diagnostic question: What possibility does the secondary character make visible that the protagonist cannot see from inside her own arc?
4. Complicating Subplots: Adding Pressure From Another Agenda
A complicating subplot grows from a secondary character’s own needs or goals and makes the protagonist’s situation harder. The character does not have to be an antagonist. A friend, parent, colleague, or ally can create complications simply by wanting something incompatible with the protagonist’s plan.
A journalist trying to expose corruption may have an editor desperate to keep the paper solvent. The editor is not evil; she simply cannot afford another lawsuit. Her business problem becomes a subplot when it develops through choices and starts restricting what the journalist can publish.
Diagnostic question: What does this character want that would matter even if the protagonist did not exist? Independent desire is what keeps a complicating subplot from feeling like an author-designed obstacle.
5. Antagonist Subplots: Developing Opposition Offstage
An antagonist subplot follows an opposing character or force pursuing an objective that develops beyond simply reacting to the protagonist. This may happen through antagonist POV scenes, through reports of what the antagonist is doing elsewhere, or through consequences the protagonist encounters.
Not every scene involving a villain creates an antagonist subplot. A villain who appears periodically to threaten the hero may still be part of the main plot only. The thread becomes a subplot when the antagonist has a developing secondary objective, relationship, limitation, or internal conflict that creates its own chain of decisions and consequences.
Diagnostic question: Does this thread reveal a goal or pressure that changes how the antagonist behaves in the central conflict?
6. Thematic Subplots: Exploring the Story’s Central Question
A thematic subplot explores the novel’s central question through another person, relationship, or situation. In To Kill a Mockingbird, the Boo Radley storyline and the Tom Robinson trial are very different in scale, yet both ask readers to confront the damage caused by prejudice, rumor, and judgments made without understanding.
Thematic subplots can be quiet, but they still need development. A recurring symbol, conversation, or anecdote is not a subplot unless something changes through it.
Diagnostic question: What does this secondary storyline allow the novel to ask that the main plot cannot ask in the same way?
When One Subplot Does Two or Three Jobs
The subplot categories become most useful when you stop treating them as boxes.
➜ A romantic subplot can also be contrasting: the love interest responds to danger in the opposite way the protagonist does.
➜ An antagonist subplot can be thematic: the villain’s private choices reveal the same moral question the protagonist is struggling with.
➜ A family subplot can be both mirror and complicating.
That overlap is often efficient. Rather than adding one subplot for emotional stakes and another for theme, ask whether a single thread can carry both. Multi-function subplots tend to feel more integrated because they matter in more than one dimension of the novel.
Types of Subplots: Choosing by Story Need
Suppose you are revising a fantasy novel about a young magistrate investigating magical disappearances. The mystery works, but beta readers say the protagonist feels emotionally distant and the middle loses pressure.
You could add two separate subplots: a romance for emotion and a rival investigator for pressure. Or you could create one rival magistrate who becomes a reluctant love interest. Their competing methods complicate the investigation, their attraction raises personal stakes, and their disagreements mirror the protagonist’s deeper question about whether justice requires obedience to the law. One subplot is now doing romantic, complicating, and thematic work.
Choose deliberately enough that you know what value the thread is supposed to add!
Types of Subplots: Purpose Worksheet
➜ What does the main plot currently lack: emotional stakes, pressure, contrast, opposition, thematic depth, or something else?
➜ Which secondary character already has the strongest reason to carry that missing function?
➜ What does that character want independently of the protagonist?
➜ How will the subplot change at least twice before it resolves?
➜ Where will its development alter a main-plot choice, cost, or consequence?
Frequently Asked Questions About Types of Subplots
What are the main types of subplots?
There is no universal list, but useful categories include romantic, mirror, contrasting, complicating, antagonist, and thematic subplots.
What is the difference between a mirror subplot and a contrasting subplot?
A mirror subplot emphasizes similarity between two conflicts; a contrasting subplot emphasizes how characters respond differently to comparable pressures. One thread can do both.
Can one subplot belong to more than one type?
Yes. These categories describe function, not fixed forms. A romantic subplot may also be thematic, complicating, or contrasting.
Is a romantic subplot required in every genre?
No. Romance is common across genres, but it should be included because the relationship adds something the story needs, not because a novel is expected to have one.
Does an antagonist need point-of-view scenes to have a subplot?
No. An antagonist subplot can develop through actions, consequences, reports, or scenes from other viewpoints as long as the opposing goal changes over time.
How do I know which subplot type my story needs?
Identify what feels underdeveloped in the main story—stakes, pressure, contrast, opposition, theme, or relationship—and choose a secondary thread that addresses that gap.
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