Character Voice Files: Building People from the Inside Out

Zach Kazanski · February 27, 2026

Early in the project, I realized that telling the AI “write a scene from Andrzej’s perspective” produced generic prose. The AI knew the character’s name and role but had no model of how he thinks — what he notices, what he ignores, how his sentences are built, what his body does under stress. The prose read like a third-person narrator who had been told some facts about a Polish soldier. It didn’t read like a mind.

The solution was character voice files — structured reference documents that give the AI enough material to write as a character rather than about them.

The Nine Sections

Each character file covers nine dimensions. Not backstory. Not plot function. The dimensions that determine how a character sounds and feels on the page:

Identity Summary. Who they are in one paragraph. Arc in two sentences. For historical figures: the anchoring details that make them real — documented quotes, attested habits, physical descriptions from primary sources.

Voice & Language. How they sound. Vocabulary range, register shifts, verbal tics, habitual constructions. The test: if I read a line of dialogue with no attribution, could I tell it’s this character? If two characters could plausibly say the same line, at least one of their voice sections needs work.

Perception & Attention. What they notice first when they walk into a room. What they miss entirely. Their metaphor domain — a soldier thinks in terrain and fields of fire; a healer thinks in symptoms and prognosis; a commander thinks in logistics and positioning. This section shapes every POV passage: the character’s attention IS the prose.

Psychology & Personality. Not adjectives (“brave,” “conflicted”) but patterns of behavior. What they do under extreme stress. Their defense mechanisms. The gap between who they think they are and who they actually are. This section is where the productive contradictions live.

Philosophy & Worldview. Not what they’d say they believe. Their operating assumptions — the ones they don’t examine. What moral compromise they’d make without hesitation. What would destroy them. This shapes their decisions in ways they can’t articulate.

Relationships & Opinions. How they relate to specific named characters — the texture, not just the label. Who do they underestimate? Who do they overestimate? This section includes exact quotes pulled from the drafted chapters, so the AI has concrete examples of how the character talks to and about specific people.

Dialogue Signature. Their conversational posture. Do they dominate, defer, redirect, interrogate? How do they argue? What’s their move when losing? This section works with the voice differentiation pass to ensure characters sound distinct at the sentence level.

Narration Mode. This is the section that matters most for POV chapters. When the prose is inside this character’s head, what does it sound like? How does emotional state affect prose style? For non-POV characters, it defines what texture they bring to any scene they enter — how their presence changes what the POV character notices.

Key Symbols & Objects. The recurring physical things associated with this character. What each object means practically and symbolically. A locket. A pipe. A knife. A scar. These objects become narrative shorthand — the reader sees the object and feels the character.

The Process

Building these files is research-intensive. For historical figures, it means web searches for primary sources, contemporary accounts, documented habits — the specific detail, not the Wikipedia summary. The gesture, the quoted phrase, the attested behavioral pattern that makes a person singular.

For fictional characters, it means reading every scene they appear in across the drafted chapters, extracting exact dialogue and physical descriptions, and finding the patterns. How does this character actually behave (not how they’re supposed to)? What verbal constructions do they repeat? What physical tells do they have?

The final check compares the new file against existing character files. If two characters could be confused — if their voice sections describe similar patterns, if their perception sections notice the same things — the new file needs sharpening.

Why It Works

The voice files are the foundation everything else builds on. The voice differentiation pass uses them to audit dialogue. The humanity pass uses them to check for private pleasures and involuntary tells. The POV pass uses them to ensure narration matches the character’s perception and attention patterns.

Without the files, the AI writes competent prose about characters. With them, it writes prose that feels like it comes from inside a specific mind. The difference is the difference between description and inhabitation.

- Zach