Keep an AI character consistent with the identity block

The hardest part of AI characters is the second picture. The first one looks great; the next one has a different nose, different hair and a different age. The identity block is how Character Prompt Builder solves that.

#What the identity block is

On the result step, open the Identity block tab. It is the part of the prompt that describes the character and nothing else: who they are, their face, hair, eyes, build and what makes them recognisable. There is no scene, no light and no camera in it.

#How to use it

1. Copy the identity block once and keep it somewhere, word for word.
2. For every new picture, write the scene and the camera for that shot: "on a rooftop at night, low angle, 35mm".
3. Put the identity block in front of it, unchanged.

The model then reads the same description of the same person every time, and only the situation changes. Change a single word in the identity block and you have told the model about a different person, so keep it byte-for-byte identical between generations.

Easier still: go back to the builder, change only the Scene and Camera & style steps, and copy the full prompt again. The identity part stays the same by itself.

#The negative prompt

Under the prompt is a Negative prompt: things to keep out, such as distorted faces, extra fingers and watermarks. Put it in your model's negative prompt field. It does not make the character consistent on its own, but it removes the most common reasons a good character comes out wrong.

#Help the model even more

• Use a reference image. Once you have one picture you like, most tools let you attach it. The identity block plus a reference is the most consistent combination.
• Keep the style the same. A character drawn as an oil painting and then as a photo will drift. Keep the Art style answer fixed across a series.
• Fewer, stronger details. One distinctive feature, such as a scar, a coloured streak or a badge, is easier for a model to repeat than ten small ones.
• Make a character sheet. Set Art style to Character sheet and the prompt asks for several views of the character on one sheet, which you can then attach as a reference. For a sheet, a turnaround or an expression sheet made from a photo, Prompt Gallery has ready prompts under People & Characters.