AI Voice for Gaming: Characters, NPCs and Trailers Fish Audio

A game does not need a narrator. It needs a cast: many characters, each with few lines, each sounding like itself every time it speaks. That is the opposite of an audiobook production, and it changes the economics — the work is casting and consistency, and per-line cost is small enough that voice passes fit into an afternoon.

This guide covers the casting pass, the batch workflow, and what a game voice pass costs.

Why game audio is a casting problem

• One character, one voice, held for months. Players recognise inconsistency instantly. The casting pass — voice, pace, pitch — is saved once and reused for every later batch.
• Barks and quest lines are different performances. A combat bark is 5 words at full energy; a quest line is 30 words of exposition. Same voice, different direction, and the direction belongs in the script as performance tags.
• Trailers want a narrator, not a character. The voice that carries a trailer is a separate cast member: steady, confident, unhurried.
• Cost should never drive line cuts. At roughly 1,000 characters per credit, a full NPC greeting set costs less than lunch, so write the lines the scene needs.

The three-step workflow

1. Cast on real lines. Audition candidate voices on the actual bark or quest line, not on a sample sentence — the voice that wins on a demo can lose on a combat bark. Save the winner per character; cloning a team member works from a 15 second recording when you hold the rights.
2. Write lines with performance tags. One line per row, a tag at the start where the emotion matters: [angry], [whisper], [excited], [tired]. Short lines read cleaner than run-on paragraphs, and tags remove the guesswork from the read.
3. Generate in batches per character, keep every line in one project per character, and regenerate the stragglers after review. Later content updates paste into the same project and match the earlier takes.

What can you ship with generated lines?

• NPC barks and greetings — combat lines, vendor chatter, ambient crowd reactions.
• Quest and dialogue prototypes — fully voiced vertical slices and playtest builds before real VO budgets exist; the character voices guide covers directing distinct characters.
• Trailers and dev logs — narration for announcements and behind-the-scenes videos.
• Machinima and fan films — multi-character scenes where every role reads as a different person.

What does a game voice pass cost?

Barks are short, so the numbers stay small:

A full character build and a trailer sit together inside one $9 Starter pack. Monetized builds and client work need the $29 Creator pack for commercial usage rights; shipping the engine inside the game itself points to the API in the $99 Studio pack — the API guide covers keys and concurrency.

Frequently asked questions

Can I keep one character sounding the same across sessions?

Yes. Casting is a one-time pass: pick the voice, audition it on real lines, and save it to the project. Every later batch — new quest lines, seasonal updates, patches — reads with the same voice, so a character recorded months apart still sounds like one person.

How do I direct emotion in a line?

Lines carry performance tags — square-bracket directions like [angry], [whisper] or [excited] — placed at the start of the line. Write the tag, the line, and nothing else on that line, and the read lands the emotion without you re-recording or re-picking a voice.

Can generated voices be used in a released game?

Yes, with the right pack. Personal prototypes are covered by the $9 Starter pack; anything shipped, monetized, or delivered to a client needs commercial usage rights, which start with the $29 Creator pack. Runtime generation inside a game points to the API in the $99 Studio pack.

How many lines should I batch at once?

Batch per character, not per scene. Paste the whole line set for one character in one pass — fifty barks or two hundred quest lines both work — so the tone stays uniform, then split the audio in your engine.

What does a game voice pass cost?

One credit covers about 1,000 characters. Fifty NPC barks of about 60 characters each is roughly 3,000 characters, so about three credits. A two hundred line character build lands near twelve credits, all inside the $9 Starter pack.

Related

• AI character voices - casting and directing distinct characters for games and animation.
• Languages hub - every language guide in one place, from Arabic to Polish.
• Fish Audio guides - the index of every workflow, tool and language on the site.