Halloween chibi characters sealed in a glass jar illustration

Create a 2:3 vertical fantasy illustration of a transparent glass jar sealed with a cork, holding 3 full-body cute chibi [characters of your choice], and the attached character in chibi style, the characters inside. A tiny handwritten tag is tied to the neck of the jar with twine, reading ["your custom text"] in a cozy script. The scene is set against a vivid gradient backdrop shifting from midnight blue aqua to soft lavender, sprinkled with magical sparkles and softly glowing stars. Keep the overall vibe cute and festive, with clean outlines, luminous pastel tones, and a crisp Halloween charm, avoid warm or vintage filters.