Shapeshifter in an Underwater Cave (Cartoon)

An energetic cartoon style shapeshifter inside a dim underwater cave morphing between forms in a single pose. The character shifts between a human diver, a jellyfish, a seahorse, and a friendly manta ray, with flowing glow lines showing the morph. The environment is a vibrant underwater cavern with jagged rock formations, stalactites, coral reefs, and bioluminescent algae casting neon light. Soft sunbeams filter from above, illuminating bubbles and sea life. The scene uses bold outlines and cel shading, with bright saturated colors like electric blues, teals, purples, and pinks. Include curious fish and small crustaceans swimming around, adding a playful adventurous mood.