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The ability to adapt to underwater environments. Variation of Environmental Adaptation.

Also Called

  • Aquatic Mutant Physiology (Marvel Comics)
  • Sub-Aquatic Adaptation
  • Undersea Adaptation
  • Underwater Adaptation
  • Water Adaptation/Capabilities/Submerging


User is able to survive and adapt to underwater environments, being able to breathe water in lieu of, or along with, a gaseous breathing medium, to swim well and to endure high water pressure and extreme water temperatures. They are able to use their senses to perceive normally regardless of the distortion/pressure of the water, possibly including ignoring various impurities that would otherwise reduce the visibility.





  • May be unable to survive on dry land for long.

Known Users



  • Ripjaws (Ben 10 Series)
  • Jetray (Ben 10 Series)
  • Nya (Lego Ninjago: Masters of Spinjitzu); via Aquatic Breathing
  • Beshte (The Lion Guard)
  • Zuma (PAW Patrol)
  • Gordon Tracy (Thunderbirds)
  • Harmonix and Sirenix Fairies (Winx Club)
  • Merliah Summers (Barbie in a Mermaid Tale)
  • Syren (Miraculous: Tales of Ladybug & Cat Noir)
  • Ladybug & Cat Noir (Miraculous: Tales of Ladybug & Cat Noir); via Aqua Form
  • Jonathan Rook/Stretch Monster (Stretch Armstrong and the Flex Fighters)
  • Mira (The Hollow)
  • Merpups (Paw Patrol)
  • Sandy Cheeks (SpongeBob SquarePants
  • Experiment 602 "Sinker" (Lilo & Stitch)


  • Aquos Bakugan (Bakugan)
  • Doraemon (Doraemon: Nobita's Great Battle of the Mermaid King); via Familiar Light
  • Dorami (Doraemon: Nobita's Great Battle of the Mermaid King); via Familiar Light
  • Arqua (Dragon Ball GT)
  • Amachi (Naruto)
  • Isaribi (Naruto)
  • Fishmen species (One Piece)
  • Merfolk species (One Piece)
  • Chaos (Sora No Otoshimono); via consuming Siren
  • Siren (Sora No Otoshimono)
  • Hideauze (Suisei No Gargantia)
  • Water-Type Pokemon (Pokemon)
  • Pyunma/Cyborg 008 (Cyborg 009)
  • Mercuphobia (Fairy Tail: The 100 Years Quest)
  • E-57 Clurken and Metarex Gillmans (Sonic X)

Live Movies

  • Gillman (Creature from the Black Lagoon)
  • Godzilla (Godzilla)
  • Guiron (Gamera vs Guiron)
  • Zigra (Gamera vs Zigra)
  • Various aquatic and amphibious species (Star Wars)
  • Sharkboy (The Adventures of Sharkboy and Lavagirl)
  • The Mariner (Waterworld)
  • The Amphibian Man (The Shape of Water)
  • Alita (Alita: Battle Angel)

Live Television

  • Sea Devils (Doctor Who)
  • Marina Aguas (Marina TV Series)
  • Aquitians (Power Rangers)
  • Aryanna (Aryanna Philippine TV Series)


  • Demigod Children of Poseidon (Percy Jackson and the Olympians)
    • Percy Jackson


  • Kori (Columbian/Venezuelan Folklore)

Video Games

  • The Four Horsemen (Darksiders)
    • War
    • Death
    • Fury
  • Chomper (New Blood Interactive's DUSK)
  • Chomper's Sons (New Blood Interactive's DUSK)
  • Archers (Hλlf-Life); Cut
  • Ichthyosaurs (Hλlf-Life series)
  • Sora (Kingdom Hearts)
  • Donald Duck (Kingdom Hearts)
  • Goofy (Kingdom Hearts)
  • Rahabim vampires (Legacy of Kain: Soul Reaver)
  • Link (Legend of Zelda); via Zora Armor
  • Merman Genome Chip Users (Project Altered Beast)
    • Leviathan
    • Luke Custer
  • Rotfishes (Quake Series)
  • Electric Eels (Quake: Dissolution of Eternity)
  • Fishmen (Serious Sam); Cut
  • Mantamen (Serious Sam); Cut
  • Water Skylanders (Skylanders)
  • Water Dragons (Skylanders)
  • Gillmen (Skylanders)
  • Titans (Skylanders)
  • Hydra (Skylanders)
  • Chaos (Sonic the Hedgehog); only in Chaos 6 transformation.
  • Clawgrip (Super Mario Bros. Series)


  • The Toa Mahri (Bionicle)
  • Red (NES Godzilla Creepypasta)

Known Objects

  • Familiar Light (Doraemon: Nobita's Great Battle of the Mermaid King); via Environmental Adaptation
  • Ena/Sea Robe (Nagi no Asu: A Lull in the Sea)
  • Gillyweed (Harry Potter)
  • Merman Genome Chip (Project Altered Beast)
  • Gills of Hamachi (Xiaolin Showdown)
  • Zora Armor (Legend of Zelda)
  • Pearl of Transformation (My Little Pony: Friendship is Magic)