The underwater world in anime has always fascinated me, and mermen definitely have their share of iconic representations. One standout is Haku from 'Spirited Away'. While he's primarily a dragon spirit, his connection to water and his fluid, elegant form give off serious merman vibes—especially when he moves through the river. Then there's the merman prince in 'Ponyo', though he's more of a supporting character. His design is whimsical and charming, fitting perfectly with Studio Ghibli's signature style. Another notable mention is from 'Mermaid Saga', where the male mermaids (or mermen) are depicted with a darker, more eerie twist, blending folklore with horror elements.
Beyond these, I've stumbled upon lesser-known titles like 'Nagi no Asukara', where the male characters have a deep bond with the ocean, even if they aren't traditional mermen. Their ethereal designs and the show's focus on underwater life make them feel like distant cousins to the classic merman archetype. It's interesting how anime often reimagines these mythical beings—sometimes as guardians, other times as tragic figures. The lack of mainstream merman protagonists makes the existing ones feel even more special, like hidden gems waiting to be discovered by fans of aquatic folklore.