# Cast block (identity lock)

People and places / Character / Prompt blocks. Checked 2026-10-13.

Each person keeps their face, build and clothes across every shot of a job.

- Use when: Any video with recurring people.
- Phrase: one line per person with only what never changes: build, hair, face features, clothing, plus where they are from and how their voice sounds, repeated word for word in every prompt
- Page: https://directorchair.ai/character/cast-block
- JSON: https://directorchair.ai/api/character/cast-block.json

## Watch out

- Only invariants in the cast block; what changes per shot goes in the shot. (practitioner; Rourke Heath (8 Aug 2026) via Director Chair field notes on video prompting)
- A fixed character in video needs the start frame and the character sheet in every job; the start frame shows only one angle. (measured; House rule)

## Prompts

### Seedance 2.5

```
Scene: [your subject] in [your setting].
Cast: [your subject]; one line per person with only what never changes: build, hair, face features, clothing, plus where they are from and how their voice sounds, repeated word for word in every prompt
Shot 1 (0:00 to 0:05): one continuous shot
```

### Seedance 2.0

```
Scene: [your subject] in [your setting].
Cast: [your subject]; one line per person with only what never changes: build, hair, face features, clothing, plus where they are from and how their voice sounds, repeated word for word in every prompt
Shot 1: one continuous shot
```

### Kling 3.0

```
[your subject], one line per person with only what never changes: build, hair, face features, clothing, plus where they are from and how their voice sounds, repeated word for word in every prompt. The scene is [your setting].
```

### Veo 3.1

```
[your subject] in [your setting]. One line per person with only what never changes: build, hair, face features, clothing, plus where they are from and how their voice sounds, repeated word for word in every prompt. Framing and subject stay as in the start image.
```

## Goes well with

- Full-body character sheet: https://directorchair.ai/character/character-sheet-full-body
- Voice line: https://directorchair.ai/character/voice-line
- The look block: https://directorchair.ai/look/global-look-block

## Source

Own words from Director Chair field notes on video prompting

Text CC BY 4.0, Director Chair (directorchair.ai). Reference clips and their card texts belong to their makers.