Pinia is a merman appearing exclusively during the Pool challenge segment, serving as the aquatic Boss guardian of that domain. His role involves evaluating participants seeking the area's medal, requiring them to out-swim him to succeed. Visually, Pinia displays blue coloration and camp mannerisms. His design and behavior directly emulate Freddie Mercury's stage persona, manifesting as flamboyant theatricality during interactions and challenges. The character's name derives from wordplay blending "mermaid/merman" with "mercury," reinforcing this inspiration. Pinia consistently employs feminine speech patterns, though this linguistic trait may originate from translation choices rather than inherent characterization in the original Japanese version.