The rule against character drift: reuse the character description verbatim in every prompt (image AND video), never paraphrase.
The biggest source of errors in AI filmmaking is character drift—the same person looks different between shots. Countermeasure: the text description is the identity anchor. Copy it verbatim, don't leave it to the model to remember.
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1. Zu welchem Department gehört „Character-Lock (verbatim)"?