Sure, in the case of Stable Diffusion, you can use the following techniques for character consistency: 

1. Train a LoRA on multiple images of your generated character, which will make sure the same character is generated each time.
2. If you cannot train a LoRA, another technique is to mix faces of celebrities and change the gender and racial description of them in the positive/negative prompt, the character you generate will be remarkably consistent while not having much resemblance to a real person.
3. Make sure to use ControlNet to ensure spatial consistency in composition.
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