# Which AI video generator is best for consistent characters?

**Short answer:** The tools differ in how they hold identity: Higgsfield builds a persistent Soul ID from 20 or more photos, Runway's Gen-4 works from a single reference image, Hedra and LTX Studio save characters as reusable Elements, and Arc attaches a reference sheet per character to every shot of a multi-episode project. Pick by the job: a real person, a one-off scene or a whole series.

URL: https://arc.katechon.technology/answers/which-ai-video-generator-is-best-for-consistent-characters
Updated: 2026-10-18

## How each tool says it keeps characters consistent

Higgsfield: Soul ID builds a persistent identity from 20 or more photos of a person; Cinema Studio 4.0 accepts up to 50 references. (Source: Higgsfield, https://higgsfield.ai/blog/best-ai-video-consistent-characters, checked 2026-10-17)

Runway: Gen-4 keeps characters consistent from a single reference image. (Source: Runway, https://runway.com/research/introducing-runway-gen-4, checked 2026-10-17)

Hedra: Save characters, products and visual references as Elements for reuse. (Source: Hedra, https://www.hedra.com/studio, checked 2026-10-17)

LTX Studio: Elements extracts characters, objects and locations from the script for reuse. (Source: LTX Studio, https://ltx.io/studio/platform/script-to-video, checked 2026-10-17)

Topview: Drama Studio takes a script or novel, builds reusable characters, locations and props, and makes shot-by-shot storyboards; Single Episode and Series modes; 9:16 recommended. (Source: Topview, https://www.topview.ai/drama-studio, checked 2026-10-17)

## What to choose for which job

Matching the consistency method to the job:

| Job | Method that fits |
| --- | --- |
| A digital double of a real person (yourself, an influencer) | An identity built from many photos of that person |
| A few shots of a new character | One good reference image |
| A cast of characters across a long series | One sheet per character attached to every shot, inside a project that holds all episodes |
| A product that must look exact | Reference photos of the real product on every shot |

## What we can say first-hand

We have only made films in Arc, so we cannot rank the other tools' results. In Arc, reference sheets held casts across Blood Sun: The Fall of Kratos (45 episodes) and High Note (40 episodes) on Seedance 2.0 Mini. The failures we hit were specific: lookalike faces getting blocked, costume changes blending unless each look had its own sheet, and small drift such as a sidekick sprouting wings. See [how to keep the same character](https://arc.katechon.technology/answers/how-to-keep-the-same-character-in-ai-video).

## Test before you commit

1. Make your lead in the tool you are considering.
2. Generate the same character in five different shots: close-up, profile, wide, night, different costume.
3. Put the five side by side. If you can not tell it is the same person, neither can your audience.

## Where Katechon Arc fits

Arc fits when you need many characters to stay consistent across many episodes, with locations and props held the same way.

Arc has no identity model trained from photos of a real person and no avatar library; for a personal digital double, a tool built on many-photo identities is the better fit.

## Related answers

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## Sources

- Higgsfield: [higgsfield.ai/blog/best-ai-video-consistent-characters](https://higgsfield.ai/blog/best-ai-video-consistent-characters), checked 2026-10-17
- Runway: [runway.com/research/introducing-runway-gen-4](https://runway.com/research/introducing-runway-gen-4), checked 2026-10-17
- Hedra: [www.hedra.com/studio](https://www.hedra.com/studio), checked 2026-10-17
- LTX Studio: [ltx.io/studio/platform/script-to-video](https://ltx.io/studio/platform/script-to-video), checked 2026-10-17
- Topview: [www.topview.ai/drama-studio](https://www.topview.ai/drama-studio), checked 2026-10-17