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साँचा:Character Infobox The Mermaid Demons are minor antagonists in Doraemon: Nobita's Great Adventure into the Underworld. They're the servants of Demaon and were tasked to lure the gang to their island with their voice and have their ally, the Whale Demon, devours them. They almost succeed in their plan until Gian unleashes his own destructive voice, scaring the Mermaid Demons and forcing them to flee as well as disabling the Whale Demon. With them gone, the gang are able to cross the ocean to the mainland.
- The Mermaid Demons only made their appearance in the original manga and film but not the remake. They are, however, present in the DS Game of the remake, playing similar role to the original movie.