"They were mostly shiny and slippery, but the ridges of their backs were scaly. Their forms vaguely suggested the anthropoid, while their heads were the heads of fish, with prodigious bulging eyes that never closed. At the sides of their necks were palpitating gills, and their long paws were webbed."
― H.P. Lovecraft's Deep Ones, The Shadow Over Innsmouth

The power to use the abilities of fish people. Variation of Cryptic Physiology and Fish Physiology. Not to be confused with Merfolk Physiology.

Also Called

  • Fish People Mimicry
  • Fishman Physiology


User with this ability either is or can transform into a fish people, category of (usually) intelligent, underwater fantasy species. While they're humanoids (one head, two arms, two legs), they don't look human; their bodies, especially the faces, have a fish-like/reptilian appearance. Their disposition/attitude towards others (especially surface folk) and ability to survive on land vary depending on the character and the series.

While Fish People are most often a pre-existing race, sometimes they are former humans (or fish) who are the result of mutation. This origin seems especially prevalent in Western Animation.




  • May have complications when transitioning from water to air.
  • Scales and skin may dry when overexposed to the Sun or artificial heat, such as fires or heaters.
  • May be vulnerable to certain diseases.

Known Users

See Also: Fish People.

  • The Gill-Man (Creature from the Black Lagoon)
  • The Gill-Man (Monster Squad)
  • The Missing Link (Monsters vs. Aliens)
  • Uncle Gilbert (The Munsters)
  • Gillfolk (Hotel Transylvania)
  • Gillmen (Skylanders)
  • Deep Ones (The Shadow Over Innsmouth)
  • Hamlet Fishmen (Bloodborne)
  • Fishmen (One Piece)
    • Arlong
  • Sea Devils (Doctor Who)
  • The Hath (Doctor Who)
  • Undersea Gal (Tim Burton's The Nightmare before Christmas)
  • Aquaphibians (Stingray)
    • King Titan
    • Surface Agent X20
  • Mon Calamari (Star Wars)
  • Syokoy (Filipino Mythology)
    • Admiral Gial Ackbar
  • Some of Jones's Crew (Pirates of The Carribean)
  • Abe Sapien (Hellboy)
  • Gill (Kim Possible)
  • Gill Beasts (Blood)
  • Nereid (Monster Girl Encyclopedia)
  • Kelpie (American Dragon: Jake Long)
  • Sahuagin (Monster Girl Encyclopedia)
  • Fish Mutants (Psychonauts in the Rhombus of Ruin)
  • Seafolk (One Punch Man)
    • Deep Sea King
  • Daagons (Teenage Mutant Ninja Turtles 2012 TV series)
  • Fishface (Dynomutt)
  • Zora (The Legend of Zelda series)

Known Objects

  • Gills of Hamachi (Xiaolin Showdown)


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