Anime Dolphin Knight in a Coral Fortress

An anime-style dolphin with large expressive eyes and a glossy blue-silver body, white belly, wearing a tiny hero scarf, leaping across a crystal moat toward the towering entrance of a colossal coral fortress. The fortress has sea-blue marble walls, soaring towers, ornate archways, and banners woven from kelp fluttering in a soft current. Sunlight filters through clear water from above, scattering beams and creating shimmering reflections on wet stone and bubbles around the dolphin. The scene is vibrant, cinematic, with clean line art, vivid color palette, and a magical underwater-fantasy atmosphere.