Prince Nalu is, so far, the only merman seen in the Disney Fairies franchise. He lives in the Mermaid's Lagoon. He is a handsome merman with pale blue skin, red tunic with gold-orange, fin shaped accents and green hair. His tail is deep blue with spiny fins like the ones on his shirt and he wears a gold webbed crown and carries a golden and coral scepter.
Nalu is as vain as any mermaid and his most precious possessions are his scepter and his mirror. He constantly admires his own reflection while he conducts his duties, reads books and even when he eats.