Browser-based character editor with live sliders and exportable backgrounds

Build a live web editor for characters I generated on Magnific. Upload a PNG and tweak it in real time: head size, body shape from lean to sturdy, height, a colour lighting that tints the whole character, and a background for 4:5 PNG export. White UI, controls beside the character, zoom, save, delete and back to original Stylized 3D art-toy character animation, Pixar-level render, 20 seconds, 16:9. The girl from the reference images (short wavy chestnut bob, brown cap with pins, freckles, rosy cheeks, dark brown oversized hoodie, olive cargo trousers, chunky trainers) on a seamless off-white studio backdrop, soft diffused light, playful squash-and-stretch cartoon physics. SHOT 1: Full body, she stands bored with hands in her hoodie pocket, side-eye. SHOT 2: Her head inflates like a balloon with a soft boing, she pats her cheeks in surprise, then it pops back to normal. SHOT 3: Her legs stretch taller, she wobbles and looks down, unimpressed. SHOT 4: A coloured light washes over her, orange to violet to electric blue, she shades her eyes. SHOT 5: The backdrop snaps from lilac to yellow to powder blue, she strikes a new pose on each beat. SHOT 6: Slow push-in to a close-up, she looks into camera, raises an eyebrow and smirks.