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Trope · Genre
Synonyms: Merman AU, Mermaid AU
Related: Animal Transformation
See Also:
Tropes · Slash Tropes · Tropes by Fandom
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Turning a character into a mermaid or merman is an AU trope in both fanfic and fanart. It can be done for humorous crack or for serious angst (i.e. based on the Hans Christian Andersen story).

Like in the fairy tale, often only one character is a mermaid/merman, so different habitat and the fish-like lower body present compatibility challenges, as illustrated in the fanart by Leslie Fish in the gallery below (which is not for a merpeople AU, but Kirk with a mermaid alien, and part of a portfolio illustrating the interspecies mating in general).

See also: The Little Mermaid.