One-off characters: the grandfather

A character who only shows up once doesn't need a Nano Banana Pro reference at all — you can describe him cold in the prompt and let Seedance invent the face on the spot. That's the whole trick behind the grandfather-fan close-up: no character asset was ever built for him. Claude Fable 5 wrote him straight into the video prompt — "an older male fan, roughly 65–75, a weathered elderly face, deep wrinkles and crow's-feet, grey/white hair" — and the model generated a convincing, consistent-enough stranger for a single 15-second shot.

The one thing you can't skip is the negative constraint. The prompt still references Santiago's player asset, because the fan is watching him on the distant pitch — but it's scoped hard: "used ONLY as the distant player the fan looks toward — his face and identity must NOT transfer to the grandfather in any way." Drop that line and you're risking the model borrowing the player's face for the grandfather, since it's the only face reference in the prompt.

Grandfather fan, final take — clasped hands, raised scarf, welling eyes, one continuous handheld push-in. Built with zero reference image, just prompt text. Locked into scene 2.

"If a character appears only once in a prompt, you can usually get away with something like this." A one-scene extra is a text description and a hard don't-copy-that-face clause — save the character-asset workflow for anyone who has to hold a consistent face across cuts.