Fritz, a blue Atlantic dolphin calf, is the devoted companion of the youngest mermaid princess. He joins her in exploring underwater realms and venturing to the surface, their bond strengthened by playful antics and shared trials—including evading storms summoned by hostile oceanic entities. When the princess resolves to engage with humanity, Fritz aids her risky surface journeys, witnessing her rescue of a shipwrecked prince and later aiding her covert observations of him. After she sacrifices her aquatic form to become human, he tirelessly seeks ways to alleviate her pain. In pivotal moments, Fritz retrieves a magical dagger provided by her sisters, a tool capable of undoing her transformation. His anguish at her final metamorphosis into sea foam underscores their unbreakable connection. Acting as a bridge between sea and land, Fritz safeguards the princess through conflicts and threats, steadfastly upholding her decisions even as they cascade toward tragedy. His loyalty persists beyond loss, embodying a protector’s resolve amid irreversible choices.