How Night Huntress Kept the Same Face for 8 Episodes: The Face-Reference Workflow

AI series rarely die from bad plots. They die when the lead walks into episode three wearing a different face. This post breaks down the exact workflow we used on Night Huntress season one: how the reference image is made, how the prompts are written, and how the same lock works for video — so your character can survive a whole season too.

ENVIRONMENT

Night Huntress season-one pipeline, 8 episodes (16 shots × 10 seconds per episode, 1280×720)

TOOLS

Image generation + first/last-frame image-to-video; reference file refs/yeer-face-closeup.jpg

TESTED ON

Workflow locked 2026-10-02; face-reference A/B test 2026-10-14

COST

See the cost table below

Why do AI characters keep changing faces mid-series?

Across the first three episodes of Night Huntress, face drift was our most expensive source of redos: the same lead, Li Ye’er, would have sharp eyeliner in one shot and a softer, sweeter stranger’s face in the next. When we locked the production workflow on 2026-10-02, “character consistency” was written in as priority number one — a ranking bought with three episodes of rework.

The mechanism is simple once you see it. Describing a character in words means re-introducing her to the model on every shot. No matter how detailed the description, the model’s reading of it shifts slightly each time — and across dozens of shots, small shifts compound into a different person. Our conclusion: stop describing the face. Show it one.

What is a face reference, and how do you crop one?

A face reference is a close-up of the character’s face, cropped from the locked character art and saved as one single file that every generation in the season references. For Night Huntress, we cropped it from Li Ye’er’s original locked portrait (refs/yeer-face-closeup.jpg). From then on, every generation featuring her — stills, video, covers — cited the same image, with the prompt stating that her features follow the reference.

Three rules govern the crop:

1. It must come from the locked art. Never build a reference by chaining generations — cropping a generated frame to seed the next round compounds the error, generation after generation, until the face has quietly become someone else.
2. The face must be large and complete. Both eyes, brows and lips clearly in frame. This image is the only “real person” the model gets to know.
3. Shrink the file before uploading. We resize references below 500KB (large character-bible images below 200KB) — oversized reference files trigger upload errors, a wall we hit early and wrote into the workflow document.

How do you write the prompt so the face actually locks?

Every Night Huntress prompt carries two fixed components. First, a verbatim style opener — “thick painterly anime illustration with visible brushstrokes, NOT photorealistic, NOT 3d render, NOT live-action” — which nails the art direction down and explicitly excludes photorealistic, 3D and live-action looks. Second, the feature anchor: the prompt states that the lead’s features match the reference image, with no room for “similar enough”.

Anything else the model likes to improvise gets written down per shot, in plain words. Rain is our standard example: only fully outdoor shots may show falling rain, while interior shots state “NO falling rain anywhere” and allow wet reflections and puddle shine only. It is the same logic as the face lock — whatever you don’t pin down, the model will happily invent.

Does the lock hold for video, not just stills?

For video we add one more input: a style reference image (style-ref-shenye-original.jpg) to keep the brushwork consistent in motion. On 2026-10-14, during full-length pipeline testing, we ran a controlled comparison on a two-character noodle-stall shot (test-shot02): same script, same first frame, one variable — whether the face reference was supplied.

The result went straight into the workflow document: any shot with a face toward camera now defaults to “first frame + face reference” mode. The lock holds for video — but only if you pick the right input mode, rather than copying the stills recipe unchanged.

What does this workflow cost?

Almost nothing in generation fees: the reference is made once, and each generation simply cites one extra image. The real cost is verification time — every output gets frame-checked by a human, and that hour is not negotiable.

The full season-one production ledger — generation counts, subscriptions, the complete time account — is a separate post, and it will be published here in full.

Failures and limits: where the lock doesn’t hold

House rule: this section is never skipped.

• This workflow exists because of a failure. When the production workflow was locked on 2026-10-02, character consistency was ranked above rain rules, weapon rules and everything else — because the drift across the first three episodes was the most expensive lesson we had.
• It locks faces, not costumes. Wardrobe detail still has to be checked shot by shot against the character bible’s four locked outfits. The reference can’t help there.
• Extreme angles still drift. Full profile and heavy occlusion carry visibly higher drift risk. The only defense is manual frame-checking — this cannot be fully automated.
• The model “beautifies” the shading. In the v3 test, the face shading still came out slightly smoother than the flat matte color blocks of the reference. The model quietly polishes faces; we have not fully solved this, and it is recorded here as-is.
• Camera moves don’t obey pixel-perfectly. First/last-frame generation treats the frames as references, not gospel: in testing, a locked-off long shot came back with a slight pull-back. If a shot needs a strict static frame, budget for a redo.

Sources and further reading

• Night Huntress season-one production records and workflow document (DC Studio internal, locked 2026-10-02): source of the consistency rules, the reference spec and the QA method.
• Full-length pipeline test log (2026-10-14): source of the test-shot02 v1 / v2 / v3 comparison results.
• Character bible for Night Huntress: Li Ye’er’s four locked outfits and original portrait art.

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