Why the character turns into someone else every time
An image generation AI reads your prompt from scratch for every image. It does not remember the face it drew last time. Countless faces fit a description like "a girl with long black hair", so as long as you rely on text alone, it picks a different one of them each time.
Writing the character's name does not help either. To the AI, a name is just a meaningless string, not a pointer to "that girl from last time". To keep the same face, you need to pass an image that says "this face" alongside the text, every single time.
Fix 1: Anchor on an approved image, not on text
In CromStudio, after you register a character's appearance, you generate a four-angle model sheet (front, three-quarter, profile and full body) and approve the one you like. The approved model sheet becomes that character's reference image and is passed along whenever you generate artwork, anime scenes, story scene images or chat portraits.
The key is to settle on a single reference image. If you make several candidates and use different ones in different scenes, each becomes its own reference and the look drifts anyway. Regenerate the model sheet until you are happy with it, approve it, and only then move on.
Fix 2: Describe the features that make them recognisable
Even with a reference image, vague appearance text lets the details slip. Hairstyles and accessories are the first to go. In the Appearance tab of the character editor, fill in the face, hair, eyes and build, and write a specific appearance note.
- Describe how the hair is tied (not just "twin tails" but "black twin tails tied above each ear")
- Add two or three features that make them instantly recognisable, such as how the fringe is parted, where a beauty mark sits, or an accessory they always wear
- Never leave out hair and eye colour (if you do, they change with every generation)
- Do not pile on features (too many cancel each other out, and none of them hold)
Fix 3: If their age or form changes, make a separate character
If you ask in text for "the same character at age 10" for a childhood flashback or a transformed look, you will get the adult version as long as the reference image shows an adult. When the reference image and the text disagree, the AI usually follows the image. Drop the reference image, and you get an unrelated stranger instead.
If there are periods when the character clearly looks different, register each look as its own character, such as childhood, teenage years and the present, and make a model sheet for each. Then cast the version from the right period in each scene.
Fix 4: Write what to draw, not what to avoid
Negative instructions like "no other people" or "no text" barely work in image generation. The very words you wrote in the negative can even get picked up as things to draw.
Instead, describe what is in the frame in positive terms. Placing concrete things where people might otherwise appear, like "She is alone in the classroom. Every seat behind her is empty.", cuts down on stray extras and look-alikes sneaking in.
Fix 5: Lock outfits in as coordinates
Even if the face holds, a character whose clothes change from scene to scene looks like a different person. If they change outfits, such as a school uniform, casual wear or battle gear, register each outfit in the asset library and composite it with the character as a coordinate.
During anime production prep, the coordinate worn in each scene is assigned automatically from the story and used as that scene's reference. If a scene gets the wrong one, you can pick it again from the reference assets. Your manual picks are not overwritten if you rerun production prep.
Fix 6: Check the first image before generating the rest
Even with the same settings, things break differently depending on the location and composition. In places where people are naturally expected, like a classroom or hallway, the AI may add people you never asked for in the background. The art style may also drift towards a different touch from the rest of the work.
Before generating in bulk, make just one image and check the face, hairstyle, outfit, art style and any stray people. If something is off, decide whether to fix the appearance note, the scene instructions or the references, then regenerate. Catch it on the first image and you only redo a few.
