How to keep characters consistent in AI video

The most common complaint about AI video is that the character does not stay the same person. The hero has a scar on the left cheek in one shot and the right in the next, the jacket changes colour, the face ages ten years across a cut. For a single clip it does not matter. For a film it breaks everything, because an audience follows a story through faces.

There is no single setting that fixes this. What works is a method: build a fixed reference, describe the character the same way every time, pass the reference into every generation, and design shots that do not ask the model to invent more than it has to. This guide covers each part.

Why characters drift

Every generation starts from random noise and is steered toward your prompt and any images you supply. Anything that is not pinned down by those inputs is decided afresh each time. If your prompt says "a woman in her thirties with dark hair", there are millions of faces that match, and the model will pick a different one on each run.

Drift gets worse with distance from your reference. A shot from the same angle and size as your reference image holds well. A profile, a low angle, an extreme close-up or a fast movement asks the model to extrapolate what the character looks like from a view it has not seen, and that is where features change.

Text alone is also lossy. You can describe a jawline, but two models, or two runs of one model, will read the words differently. An image carries far more identity than a paragraph, which is why reference images are the backbone of every consistency method.

Step 1: build the character reference

Before you generate a single scene, create the character. Generate portraits until you have a face you want, then use that approved image as the reference to produce the same person from other views: a three-quarter angle, a profile, a full-length shot in costume, and a couple of expressions. Traditional animation calls this a character sheet or turnaround.

• Use a plain background and even, neutral light for the reference images, so the model learns the character rather than a lighting setup.
• Keep the costume exactly as it will appear in the film. If the costume changes in the story, make a reference for each costume.
• Reject any reference image where a detail is off, even slightly. Every later shot inherits its mistakes.
• Store the approved references somewhere you can reach from every shot. On a canvas, that means keeping them next to the generators that will use them.

Step 2: lock the written description

Write one description of the character and paste it into every prompt that features them, word for word. Include the features that carry identity at a distance (age, build, hair, skin tone, a distinctive feature) and the costume in specific terms (colours, materials, one or two signature items).

Meera, a woman in her early thirties, slim build, shoulder-length black hair with a grey streak at the left temple, warm brown skin, a small silver nose stud, wearing a faded olive field jacket over a rust-coloured kurta and dark jeans.

Give the character a name in your own notes, but do not rely on a name to carry identity in the prompt. Models do not know who "Meera" is; they only know the words after it.

Step 3: pass the reference into every shot

Most of the consistency comes from giving the model an image, not from the words. There are three ways to do it, and a production will usually use all three.

1. 1

   Reference images for stills

   When generating storyboard frames, attach the character reference to the image generation along with the scene prompt. Image models that accept references use them to keep the face and costume while changing pose, setting and light.

2. 2

   The approved frame as the first frame

   When animating, start the video from the storyboard frame, which already shows the right character. The video model then only has to keep them steady while they move, rather than invent them.

3. 3

   Reference images for video

   Some video models also accept reference images directly, in addition to or instead of a first frame. Use them for shots where the character turns, moves toward camera or is seen from a new side.

Not every model supports every input. Check which image and video models accept references before you plan a shot that depends on them. On Pindow, you can right-click any image on the canvas and use it as a reference for the image generator, and several of the video models listed on our models page take reference images or a start frame.

Step 4: design shots that protect the character

Good consistency is as much a directing decision as a technical one. Choose shots that keep the character close to what your reference shows, and use editing to hide what the model struggles with.

• Stay near the reference angle for key emotional moments. A frontal or three-quarter close-up will hold far better than a sharp profile you have no reference for.
• Let wides do the travelling. Movement across a location reads well in wide shots, where small facial differences are invisible.
• Use silhouettes, backs and hands. A character seen from behind, in silhouette or through an insert of their hands carries the story without testing the face.
• Cut on action. A cut during a turn or a gesture draws the eye to the movement, not the face.
• Lean on costume. A signature item, like a red scarf or a battered hat, carries identity even when the face varies slightly.
• Keep lighting consistent within a scene. A new light direction changes how a face reads more than most people expect.

Two or more characters in one shot

Shots with two recurring characters are the hardest, because models tend to blend features between people who share a frame. A few approaches help:

• Make the characters visually distinct in ways that survive blending: different hair colour and length, different build, clearly different costume colours.
• Describe each character in the same order every time, and anchor each to a position ("on the left", "in the foreground").
• Cover dialogue with singles instead of two-shots. Shot–reverse shot was the standard way to film a conversation long before AI, and each single only has to hold one face.
• For the establishing two-shot, keep the camera wide enough that fine features matter less.

Checking and fixing continuity

Review in sequence, not one clip at a time. Lay the storyboard frames or the takes side by side and compare the character against the reference. Look for the details that usually slip: hairline and parting, eye colour, facial hair, scars and moles, jewellery, and the colours of each costume item.

When a shot drifts, change one variable at a time. Try the same prompt with a stronger or closer reference, move the shot closer to the reference angle, simplify the action, or switch to a model that holds identity better for that kind of shot. If a take is perfect except for a small detail, it is often faster to fix the still frame and regenerate the motion than to keep rolling new takes from text.

Doing it on Pindow

On a Pindow canvas, keep each character’s approved reference images on the board next to your generators. Right-click an image and choose to use it as a reference, and it is attached to the image generation. When a storyboard frame is right, turn it into a video with that frame as the start. The Prompt Engine’s character builder helps you compose the locked description from fields like age, face, hair and clothing, so it reads the same in every shot.

For motion that must end on a particular pose or framing, pair this guide with first frame and last frame in AI video. For where characters fit in the wider process, see the AI filmmaking workflow.