A staircase earns its keep by being climbed in the same order every time. A character kept on a card at the middle step gets the same benefit: her description is written once, and every tool that climbs past reads that card — not a fresh description invented on whichever step the tool happens to occupy.
The card holds five lines in fixed order. Age, a plain number. Hair — colour, length, habitual style. Build in two or three words. Face — one or two enduring details. Signature — the detail that survives a tight crop. On the day’s line beside the card: outfit, step, hour, light — the things meant to change at every sitting.
Paste the card word for word at the head of every prompt, whichever tool is running. Generate at the standard 6 credits on the ground step, judge against the card on the middle step, and let the editor, the swaps and the upscalers work only on what judging has passed.
Eight tools, three steps, one card. That is the entire system of this studio, and it has never lost a character on the stairs.