AISkills/flat-artist/remotion-character-design/SKILL.md

name, description

name

description

remotion-character-design

How to build and animate 2D (SVG) and 3D (@remotion/three) characters and mascots for FlatRender Remotion templates. Use when a template needs a character — a mascot, Haji Firuz, animals (goldfish, butterflies), people, or any articulated figure. Covers construction from primitives, rigging via grouped transforms, animation cycles (walk/dance/idle), facial expression, and the 2D-vs-3D / GLTF trade-offs.

Character design for Remotion

We have NO rigged 3D model assets and the asset CDNs are geo-blocked, so characters are built from primitives — SVG shapes (2D) or Three.js geometries (3D) — and animated off useCurrentFrame(). Reference implementations: NowruzGreeting.tsx (2D Haji Firuz, goldfish, butterflies) and Nowruz3D.tsx (3D scene).

Core principle: build in parts, rig with groups

A character = a tree of grouped parts, each animated by transforming its group around a PIVOT.

• 2D: nested <g transform="translate/rotate/scale">. Put the pivot at the joint (e.g. shoulder) by translating the group there, drawing the limb from origin, and rotating the group.
• 3D: nested <group position rotation>. Same idea — position the group at the joint, model the limb from there, rotate the group.

2D characters (SVG)

Construction kit:

• Head = <circle>; body = <path> trapezoid (M.. Q..); limbs = <rect rx> (rounded) or <path>; hands/feet = small ellipses; hat = <path> triangle/cone.
• Face (friendly/stylized): two dot eyes, a Q curve smile, rosy circle cheeks at low opacity. Keep it simple — over-detailing reads worse, not better.
• Skin/clothing: flat fills + one darker shade for a soft AO at edges (fillOpacity overlay).

Animating cycles (all from frame):

• Idle/breathe: body scale.y = 1 + 0.02*sin(frame/30).
• Dance/bounce: whole body translateY = -abs(sin(frame/7))*H, plus a small rotate(sin(frame/7)*4) sway; legs counter-rotate.
• Limb swing: rotate(amp*sin(frame/period)) around the joint pivot.
• Hop-in entrance: spring() from off-frame X to the target, then switch to the idle/dance loop.
• Prop shake (tambourine, flag): rotate(sin(frame/3.2)*18) + sparkle accents on peaks.

3D characters (primitives)

Build the figure from: sphereGeometry (head/joints), cylinderGeometry/capsule (limbs/torso), coneGeometry (hat/skirt), RoundedBox (blocky bodies), torusGeometry (rings/mouth). Group per limb for articulation. Material: meshStandardMaterial (roughness ~0.5 for cloth, lower for shiny). Light with three-kit StudioLights; add a soft contact shadow (a dark blurred plane or shadows + a floor).

• 3D animation is the SAME math (rotate/translate groups by frame), just in 3D space and you can also move the camera/scene for parallax.
• Faces in 3D are hard — keep them simple (sphere eyes, a small torus/curve mouth) or face the character slightly away.

Animation principles (what makes it not look stiff)

• Anticipation: dip before a jump, wind-up before a throw.
• Squash & stretch: scale on impacts/landings (subtle: ±8%).
• Overlap / secondary motion: hat ball, scarf, string, ears, tambourine lag behind the body — offset their phase.
• Easing: Easing.out(Easing.cubic) for arrivals, spring() for bouncy pops, never linear for organic motion.
• Hold: let a pose read for a beat before the next move.

Cultural / brand-safety notes

• Default to a modern stylized look (friendly, non-realistic) unless the user asks otherwise. Specifically for Haji Firuz: red costume + conical hat + tambourine, but a friendly non-blackface face (avoids the blackface connotation).
• Confirm a storyboard with the user BEFORE building complex characters (the project convention) — list the cast, the beats, and the look.

When NOT to hand-build

• Photoreal humans or complex rigged motion → out of scope without GLTF assets; propose a stylized take or a non-character design instead.
• If a GLTF model IS provided, load with drei useGLTF and animate transforms by frame (no useFrame).

Workflow

Storyboard → build parts → rig groups → animate cycles → render stills at 3-4 beats and LOOK → refine → render all 3 aspects (see ../remotion-aspect-ratios/SKILL.md — characters must sit in the safe zone in 9:16 too).

Related: ../remotion-design-styles/SKILL.md, ../remotion-aspect-ratios/SKILL.md, ../remotion-template-catalog/SKILL.md.