Create a parody poster for The Little Mermaid where instead of the mermaid, Batman is featured in the exact same pose and style as the original poster. Batman should be underwater, holding a trident, with a sleek and dark costume that includes shells on the front, resembling the ones in The Little Mermaid's attire. Surround Batman with sea creatures and include the villain Úrsula in the background, with her signature tentacles and menacing expression. Add Sebastian the crab next to Batman, with his usual cheerful and musical expression, as well as the fish friend (Flounder) beside him, looking cute and friendly. The background should mirror the iconic underwater setting from the original Little Mermaid poster, with blue water, coral reefs, and rays of light streaming down. The text should match the style of the original poster, with ‘Batman’ replacing ‘The Little Mermaid’. Ensure the overall tone is visually identical, while maintaining the heroic presence of Batman, the playful inclusion of supporting characters, and the thematic touch from The Little Mermaid with Batman’s trident and conch details."