Higgsfield Soul ID — Character Consistency

What Is Soul ID?

Soul ID is Higgsfield's character consistency system. Create a character reference once, then reuse it across unlimited generations — different scenes, angles, lighting, and actions — while the face and core appearance remain consistent.

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How It Works

1. Create a Soul ID — Upload a reference image or generate one using Soul 2.0
2. The platform stores the character — assigns it an ID
3. Reference in future prompts — "using Soul ID character [name/reference]"
4. Character stays consistent — face, skin tone, basic features carry across generations

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When to Use Soul ID

✅ You're building a multi-shot sequence with the same character ✅ You're creating a short film / story with a recurring protagonist ✅ You're making an AI influencer or brand mascot ✅ You want consistent faces across a product ad campaign ✅ You're doing a multi-scene action sequence and need the hero to look the same

❌ Don't use if you only need one shot — overkill for single generations ❌ Don't use if you want maximum creative variation — consistency limits style range

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Prompting With Soul ID

When a Soul ID character is active, your prompt should:

1. Reference the character simply:

The Soul ID character walks through a crowded Tokyo street at night.

2. Describe what changes — not what the character looks like:

The Soul ID character now wears a formal black suit. She stands at a podium,
addressing a conference room. Camera: Dolly In toward her face.
Style: Cinematic, cool corporate lighting, 16:9.

3. You can change clothing, setting, expression:

The Soul ID character is now in a red dress, dancing alone in a ballroom.
Camera: 360 Orbit.
Style: Cinematic, warm golden chandelier light.

Key rule: Don't re-describe the face or core features — the Soul ID handles that. Only describe what is different from the base character.

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Identity vs. Motion Separation — Hard Rule

When Soul ID is active, every prompt MUST be split into two blocks. This is the single most important rule for preventing identity drift.

Identity Block — Static descriptors only

Contains: face features, clothing, body type, distinguishing marks, color palette. Does NOT contain: any motion, camera, speed, or temporal language.

Motion Block — Temporal and camera only

Contains: camera movement, action choreography, speed, environmental changes. Does NOT contain: any character appearance repetition.

Before/After Examples

Example 1 — Action scene:

❌ Mixed (bad) — causes identity drift:

A tall woman with green eyes and freckles in a leather jacket sprints through
a warehouse while the camera tracks her and her green eyes flash with determination
and her freckles catch the fluorescent light as she vaults over a railing.

Face morphs mid-clip because the model re-reads face descriptors while processing motion.

✅ Separated (good) — identity stays locked:

Identity Block:

The Soul ID character — tall build, green eyes, light freckles across the nose
and cheeks, wearing a fitted black leather jacket, dark jeans.

Motion Block:

She sprints through a dimly lit warehouse, vaults over a metal railing
without breaking stride.
Camera: Action Run — low behind her, matching pace.
Fluorescent lights flicker overhead.
Style: Cinematic, cold industrial blue, high contrast. 16:9.

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Example 2 — Emotional close-up:

❌ Mixed (bad) — face warps during camera move:

A weathered man with deep wrinkles and sad brown eyes wearing a grey wool coat
sits on a park bench as the camera slowly dollies in on his wrinkled face and
sad brown eyes while autumn leaves drift past his grey coat.

✅ Separated (good) — face stays sharp:

Identity Block:

The Soul ID character — man in his 60s, deep wrinkles, warm brown eyes,
wearing a heavy grey wool coat, brown leather gloves.

Motion Block:

He sits on a park bench, hands folded in his lap, staring at the ground.
A single autumn leaf drifts into frame and lands on the bench beside him.
Camera: slow Dolly In toward his face.
Style: Cinematic. Overcast diffused light, muted earth tones. 16:9.

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Example 3 — Cinema Studio (@ Elements):

❌ Mixed (bad) — identity in the prompt field:

@Sarah with her dark curly hair and tattoo sleeve walks into the bar.

✅ Separated (good) — identity in the Element, motion in the prompt:

@ Element definition (set in Cinema Studio UI):

@Sarah: dark curly hair, tattoo sleeve on left arm, wearing a vintage band tee.

Prompt field:

@Sarah pushes open the door and steps inside. She scans the room, then walks
to the far end of the bar. The bartender nods.

Which descriptors belong where

Identity Block	Motion Block
Face shape, skin tone, eye color	Camera movement name
Hair style, color, length	Action verbs (runs, turns, sits)
Body type, height, build	Environmental motion (wind, rain, lights)
Clothing, accessories, jewelry	Speed and timing cues
Scars, tattoos, distinguishing marks	Atmospheric changes (light shifts, fog)
Color palette of the character	Style and color grade of the scene

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Creating a Strong Soul ID Reference

The quality of your Soul ID reference image determines consistency quality.

For best results:

• Use a front-facing or 3/4 angle portrait — full face visible
• Even lighting — avoid harsh shadows obscuring features
• Neutral to slight expression — smile is fine, extreme emotion limits flexibility
• Clear image — no blur, no obstruction, no glasses if avoidable
• Solo subject — no other people in the reference frame

Image models to generate your Soul ID reference:

• Soul 2.0 — best for fashion-forward, high-aesthetic characters
• Nano Banana Pro — best for maximum photorealistic sharpness
• Seedream 4.5 — good for a range of styles

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Character Sheet Creation

A character sheet is a multi-angle reference image showing the same character from several viewpoints — typically front, 3/4, side profile, and back. It gives the model comprehensive geometry to work from and dramatically improves consistency.

How to create a character sheet:

1. Generate your character in Cinema Studio using your preferred optical stack
2. Use Grid Generation (2×2 or 4×4) to produce multiple variations
3. Alternatively, use 3D Mode (Gaussian splatting) to orbit a single generation and capture front, side, and 3/4 angles
4. Arrange the best angles into a single composite reference image
5. Upload as your Soul ID reference

What to include on a character sheet:

• Front face — neutral expression, even lighting
• 3/4 angle — shows depth of facial features
• Side profile — nose, jaw, ear structure
• Full body (optional) — posture, costume, proportions

Prompt pattern to generate character sheet content:

Front-facing portrait of [character description], neutral expression, even studio lighting,
clean background. Head and shoulders visible.

Then use 3D Mode to orbit and capture additional angles from the same generation.

Why it matters: A multi-angle character sheet gives Soul ID far more geometry data than a single photo. This translates directly into better consistency across extreme angle changes, action shots, and profile views.

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Micro-Expressions — Nuanced Performance Direction

Use these facial performance directions to add emotional depth to Soul ID characters. Combine with Soul Cast or character prompting for precise actor-level control.

Core Set

Name	Description	Best for
Deadpan Neutral	Flat affect, no visible emotion, mask-like stillness	Thriller, interrogation, AI/android characters
Fierce Focus	Intense locked gaze, brow slightly lowered, total attention	Action, competition, confrontation
Subtle Arrogance	Chin slightly raised, half-lidded eyes, faint smirk	Villain intros, power dynamics, fashion
Candid Profile	Unposed side angle, natural and unaware of camera	Documentary, street photography, slice-of-life
Post-Workout Fatigue	Heavy lids, parted lips, light sheen of sweat, relaxed muscles	Fitness, aftermath, exhaustion scenes
Predator Glare	Unblinking stare, head slightly lowered, eyes locked forward	Horror, thriller, intimidation
Sunblind Squint	Eyes narrowed against bright light, slight grimace	Outdoor scenes, desert, beach, golden hour
Total Dissociation	Thousand-yard stare, eyes unfocused, emotionally absent	Trauma, shock, psychological drama
Controlled Breath	Lips slightly parted, nostrils flared, deliberate calm	Pre-action tension, meditation, recovery

Extended Set

Name	Description	Best for
Suppressed Smile	Fighting back a grin, corner of mouth twitching	Comedy, secret joy, romantic tension
Quiet Devastation	Eyes glassy, jaw tight, holding it together	Drama, grief, emotional climax
Wary Recognition	Eyes widen slightly, head tilts back a fraction	Reunion, suspicion, plot twist reaction
Nervous Composure	Calm face but swallowing, micro-tension in jaw	Interviews, lies, high-stakes poker
Cold Calculation	Eyes scanning, no emotional leakage, clinical	Villain strategy, heist planning, espionage
Bitter Amusement	One-sided smirk, eyes not smiling	Cynicism, dark humor, betrayal aftermath
Exhausted Relief	Eyes closing, shoulders dropping, breath release	Survival, rescue, end of ordeal
Frozen Shock	Mouth slightly open, eyes fixed, body still	Jump scares, bad news, sudden revelation
Simmering Rage	Clenched jaw, flared nostrils, steady stare	Confrontation, injustice, slow burn tension
Vulnerable Openness	Soft eyes, slightly parted lips, unguarded	Romance, confession, emotional honesty

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Multi-Character Consistency

If you need multiple consistent characters in the same scene:

Shot 1 — establish both:
The Soul ID character [Character A] and a second character [Character B, describe
appearance] face each other across a table. Camera: Arc slowly around them.

Shot 2 — reference both:
The Soul ID character [A] slides a folder across the table.
[Character B] opens it, expression shifting from confusion to realization.
Camera: Dolly In toward [B's] face.

Note: Higgsfield can hold multiple Soul IDs. Reference each clearly in the prompt.

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AI Influencer Workflow

Soul ID is the foundation of Higgsfield's AI Influencer Studio feature.

Workflow:

1. Create Soul ID from a high-quality portrait (generated or uploaded)
2. Generate images of the character in different outfits/settings
3. Animate using image-to-video with motion presets
4. Use Lipsync Studio to add speech if needed
5. Chain shots together for a full content series

Prompt pattern for influencer content:

The Soul ID character [name] is in a modern kitchen at golden hour.
She holds a coffee mug, steam rising. She looks directly at camera with a warm smile.
Camera: slight Dolly In. Style: Lifestyle, warm tones, 9:16 vertical.

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Negative constraints: For face/identity artifacts (face morphing, identity drift, character swap, plastic skin) and their prevention phrases, see

../shared/negative-constraints.md

— Face/Identity Artifacts section.

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Cinema Studio 3.0 Soul Cast (Business/Team Plan)

Plan requirement: Cinema Studio 3.0 Soul Cast is available exclusively on Business and Team plans.

Cinema Studio 3.0 carries over Soul Cast's 8 parameter categories from 2.5:

Category	Options
Genre	General, Action, Horror, Comedy, Noir, Drama, Epic
Budget	$10M – $500M (affects production value aesthetic)
Era	1900s – 2020s (decade increments)
Archetype	Innocent, Everyman, Hero, Caregiver, Explorer, Rebel, Lover, Creator, Jester, Sage, Magician, Ruler (12 options)
Identity	Gender, race, age
Physical Appearance	Build, height, eye color, hair style, hair texture, hair color, facial hair
Details	Scars, tattoos, accessories, distinguishing marks
Outfit	Clothing, materials, colors

3.0 Soul Cast Modes

Mode	Purpose	Output
General	Open-ended character generation	Character image
Character	Focused character creation with detailed parameters	Character image
Location	Environment/setting generation	Location image

3.0 Soul Cast Specs

• Image resolution: up to 4K (Character/Location modes) · up to 2K (General mode)
• Batch size: 1 or 10
• Generation cost: 0.125 credits per image

Character Consistency Best Practices

Use 2–3 clear, well-lit reference shots:

• Frontal view (primary identity anchor)
• 3/4-angle view (dimensional understanding)
• Side profile (silhouette + hair/ear/jawline)

Outfit descriptions must be specific:

• "casual clothes" →

  fitted olive-green cotton t-shirt, dark indigo slim jeans, white leather sneakers with red accents

• Include materials, colors, and distinctive details that the model can anchor to

In I2V workflows — describe action, not appearance: The reference image already carries the character's visual identity. Re-describing their appearance creates conflict.

• Wrong:

  @Image1 — A woman with curly brown hair and green eyes wearing a red jacket walks through the park.

• Right:

  @Image1 — She walks through the park, pausing to look up at the falling leaves. Camera: slow tracking alongside.

If features drift between shots: Use the character sheet image directly as @Image1 for tighter identity anchoring. A clean, well-lit character sheet outperforms multiple casual photos.

Multi-character scenes: Reference each character separately with distinct @Image tags:

@Image1 as Character A (the detective). @Image2 as Character B (the witness).
Character A leans across the table, speaking firmly. Character B looks away, fidgeting.
Camera: slow push-in on Character B's face.

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Related skills

• higgsfield-prompt

  — MCSLA formula, Identity vs. Motion separation rule

• higgsfield-cinema

  — Cinema Studio Reference Anchor, Soul Cast, @ Elements

• higgsfield-moodboard

  — Soul Hex color palette for character consistency

• higgsfield-pipeline

  — Multi-shot workflow with Soul ID

• higgsfield-recall

  — Pre-generation memory check for character drift history

• templates/

  — Templates 03, 04, 05, 06, 08, 09, 10 include Identity/Motion Block examples