Character Arc: Why Characters Must Change

After finishing some stories, you cannot remember the protagonist—not because they were not distinctive enough, but because they were the same person from beginning to end. These stories often have a complete plot and conflict, but they lack one thing: by the end of the story, the character is no longer the same as they were at the beginning. That “difference” is the character arc.

1. Why audiences need characters to change

First, understand the principle. When an audience follows a story, they are essentially following a character through a process. If the character does not change at all during that process, then the “experience” loses its meaning—they come in one way, leave the same way, and what happens in between has no effect on them. This leads to two consequences:

• First, emotional investment fails. The reason audiences are willing to invest emotionally is that they expect “what this experience will bring.” If there is no change, that investment has nowhere to land.
• Second, the theme cannot be conveyed. A story’s theme is usually embodied through a character’s change. A character going from “not trusting others” to “being willing to trust” is itself the theme. If the character does not change, the theme can only be stated directly through dialogue, which is far less effective.

So a character arc is not a “bonus”; it is one of the basic structures of storytelling.

2. The four stages of an arc

A complete character arc usually contains four stages.

• Stage one: the initial state.

At the beginning of the story, the character is in a relatively stable state. The key is to make clear what their core belief or flaw is in this state. Belief determines how they see the world, and it also determines what choices they will make. This step must be established early in the story—the audience needs to know “what this person was originally like” in order to perceive the later change.

• Stage two: the inciting event.

An event breaks the original stability and forces the character to face a new situation. This event is usually the starting point of the story. The function of the inciting event is to push the character out of their comfort zone. Without this step, the character has no reason to change.

• Stage three: the transformation process.

This is the main body of the arc and also the hardest part to write. Under pressure, the character gradually changes: trying, failing, adjusting, and trying again. Change is not completed all at once; it comes through repetition. The most common problem here is “change that happens too quickly”—the character figures everything out in a single scene. Real change needs a process, and the audience also needs time to accept it.

• Stage four: the final state.

At the end of the story, the character is in a state different from where they began. This difference should be clearly describable—from “afraid to take responsibility” to “actively taking responsibility,” from “only seeing themselves” to “being able to see others.” The final state does not need to be “better.” A negative arc is equally valid—from belief to doubt, from idealism to reality. The key is to have a clear direction of change.

3. Three types of arcs

Arcs are not limited to “becoming better.”

• Positive arc: the character overcomes their own flaw and becomes a better version of themselves. This is the most common type.
• Negative arc: under pressure, the character gives up what they once held on to and moves toward downfall or failure. This type of arc is usually used in tragedy or cautionary stories.
• Flat arc: the character themselves does not change, but their conviction changes the world around them. The defining feature of this type of arc is that the character is the “measuring stick,” used to measure the gap between them and their environment.

A flat arc is often misunderstood as “having no arc.” In fact, the change happens in the relationship between the character and the world: at the beginning, the world does not understand them; by the end, the world has been changed by them. The character does not change, but their position changes. Which type you choose depends on what the story wants to express. But no matter which type it is, one thing must be clear: what is the direction of change?

4. Why an “unchanging character” feels exhausting

Return to the opening question. A character who is the same from beginning to end can make the audience feel a strange kind of fatigue. The reason is that audiences expect a character’s actions to have “accumulation.” If the character has learned a lesson in the story, they should react differently the next time they encounter a similar situation; if they make the same choice and the same mistake every time, the audience will feel that “these plot points are repetitive”—even if the events themselves are different. This fatigue is not always a bad thing. If the goal is to express the theme that “the character cannot change,” then repetition is an intentional design. But if the arc simply has not been considered, then it is a structural flaw.

5. Change needs “evidence”

A practical question: how do you make the audience believe the character has truly changed? Having them say “I’ve changed” through dialogue is ineffective. Change must be shown through concrete behavior—the character makes a different choice in the same kind of situation.

• A common approach is to set up echoing scenes: there is a scene at the beginning of the story that shows a certain reaction from the character, and near the end there is a similar situation where the character reacts differently. Through this contrast, the audience reaches the conclusion on its own.

This approach also affects production: these “echoing” scenes need to be designed and filmed. In NadouPro, changes in a character’s state can be managed—during subject extraction, the character’s base state and script-related substates are extracted, and these states correspond to how the character looks at different stages; the character asset library supports filtering by conditions such as name, tag, gender, age range, skin color, hair color, and body type. Only by saving multiple states of a character as assets can the visual presentation of echoing scenes match accurately.

• Another method is the expression of facial expressions and emotions. The Character Expression 9-Grid in multi-panel templates is suitable for generating multiple expressions at once—placing the character’s emotional states at key points side by side makes it intuitive to check whether the “emotional change holds up.”

6. Several common misconceptions

• Misconception one: treating “many events” as “having an arc.” The character goes through many things, but if they react the same way every time, it is equivalent to no change.
• Misconception two: change without a cause. The character suddenly understands, suddenly becomes brave, and lacks a trigger and a process, so the audience will not accept it.
• Misconception three: change that happens too quickly. Completing a cognitive shift in one scene compresses the struggle that should have been there.
• Misconception four: writing only positive arcs. Negative arcs are just as powerful; do not assume by default that a character must become better.
• Misconception five: using dialogue instead of behavior. A character’s change must be shown through “making a different choice in a similar situation.”
• Misconception six: ignoring the environment. A flat arc depends on the world’s reaction; if the environment also never changes, then there is no way to show change.

Finally

The essence of a character arc is to give meaning to a character’s experience. It answers the question: after this story is told, how is the character different from when they began? If you cannot answer that, then the events in the middle are only events, not a story. So at the conception stage, first clarify the character’s starting point and ending point—what state they move from and to, and what causes the change in between. Once this line is clear, the plot has something to attach to, and the audience has a reason to invest.

Contains AI-generated information that may be incorrect. Please verify independently.