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Merfolk Physiology

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Merfolk Physiology
Mermaid Cove
Mermaid Grove (One Piece)

Power/Ability to:

Use the traits of merfolk

The power to use the abilities of Merfolk. A Variation of Mythic Physiology and Fish Physiology.

Also Called

  • Merfolk Mimicry
  • Merkind Mimicry/Physiology
  • Mermaid/man Mimicry/Physiology
  • Merpeople Mimicry/Physiology


User with this ability either is or can transform into a merfolk (male or female), with the upper body of a humanoid and the lower body (in taur-style) of either that of a fish or cetacean. Some are able to transform completely into humanoid form to move on land and some can split their tail into legs. Others have to find other ways to move while on land.

Merfolk are sometimes depicted as perilous creatures associated with floods, storms, shipwrecks, and drowning. In other folk traditions (or sometimes within the same tradition), they can be benevolent, bestowing boons, teaching or even falling in love with humans.



According to Japanese legends, eating the flesh of a mermaid may also grant Semi-Immortality or Immortality, and their other organs/body parts, such as the blood or liver, may have similar and related effects. Understandably, this can have unpleasant side-effects.



  • May have complications when transitioning from water to air.

Known Users

See Also: Our Mermaids Are Different


  • Mermaids/Mermen (Folklore/Mythology)
  • Ningyo (Japanese Mythology)
  • Tritons (Greek Mythology)
  • Sea Deities (Mythology)


  • Aquamarine (Aquamarine)
  • Siu May (Mermaid Got Married)
  • Madison (Splash!)
  • Diana (Mermaids)
  • Nereid (Fishtales)
  • Barnaby (Sabrina Down Under)
  • Finn (Sabrina Down Under)
  • June (Mermaids)
  • Venus (Mermaids)
  • Cleo Setori (H2O: Just Add Water)
  • Emma Gilbert (H2O: Just Add Water)
  • Rikki Chadwick (H2O: Just Add Water)
  • Charlotte Watsford (H2O: Just Add Water)
  • Gracie Watsford (H2O: Just Add Water)
  • Julia (H2O: Just Add Water)
  • Sirena and the Mermaids of White Cap Bay (Pirates of the Caribbean: On Stranger Tides)
  • Louise Chatham (H2O: Just Add Water)
  • Bella Hartley (H2O: Just Add Water)
  • Zac Blakely (Mako: Island of Secrets)
  • Sirena (Mako: Island of Secrets)
  • Nixie (Mako: Island of Secrets)
  • Lyla (Mako: Island of Secrets)
  • Rita Santos (Mako: Island of Secrets)
  • Aquata (Mako: Island of Secrets)
  • Maya (Mako: Island of Secrets)
  • Ondina (Mako: Island of Secrets)
  • Mimmi (Mako: Island of Secrets)
  • Erik (Mako: Island of Secrets)
  • Evie McLaren (Mako: Island of Secrets)
  • Marina Aguas (Marina TV Series)
  • Aryana Mendez (Aryana TV Series)
  • Princess Neptuna (Aryana TV Series)
  • Josephine as Dyosa Agua (Dyosa TV Series)
  • Cody Griffin (The Thirteenth Year)
  • Cody's mother (The Thirtheenth Year)
  • Ariel (Once Upon A Time)
  • Ursula (Once Upon A Time)


  • Ariel (The Little Mermaid)
  • Melody (The Little Mermaid II: Return to the Sea); being half human and half mermaid
  • Poseidon (Hercules)
  • Amphitrite (Hercules)
  • Winx Fairies (Winx Club); by evolving into their Sirenix transformation
  • Triton (Hercules - the Animated Series)
  • Bai Tza (Jackie Chan Adventures)
  • Merna the Merhog (Adventures of Sonic the Hedgehog)
  • Alim Coelacanth (Teenage Mutant Ninja Turtles; 1987 TV series)
  • Mermando ("Gravity Falls")


  • Eve (Black Cat)
  • Aria (Dog Days)
  • Golden Darkness (To Love-Ru)
  • All Merfolk (One Piece)
  • Tears of a Mermaid (Yu-Gi-Oh!)
  • Enchanting Mermaid (Yu-Gi-Oh!)
  • Cure Mermaid (Yu-Gi-Oh!)
  • Toon Mermaid (Yu-Gi-Oh!)
  • Mermaid Knight (Yu-Gi-Oh!)
  • Mermaid Archer (Yu-Gi-Oh!)
  • Rainbow Marine Mermaid (Yu-Gi-Oh!)
  • Sentinel of the Seas (Yu-Gi-Oh!)
  • Sirenoid (Bakugan)
  • Mutio (Blue Submarine No. 6)
  • Mermaid Princesses (Mermaid Melody Pichi Pichi Pitch)
  • Mawari Zenigata (My Bride is a Mermaid); temporarily
  • Sun Seto (My Bride is a Mermaid)
  • Lunar Edomae (My Bride is a Mermaid)
  • Aquarius (Fairy Tail)
  • Tamao Ichinose and the Swim Club (Rosario + Vampire)
  • Mermista (She-ra the princess of Powers)
  • Namiko (Ghost Sweeper Mikami)


  • Merkinds (Arkwell Academy)
    • Britney Shell
  • Merpeople (Harry Potter)
  • Mermaids (Shadowhunter Chronicles)


  • Merpeople (DC Comics)
  • Mer-People (Marvel Comics)
  • Mermaid (Marvel Comics)

Video Games

  • Leia (Harvest Moon)


  • Merfolk (Magic: The Gathering)
  • Merfolk (Dungeons & Dragons)
  • Mermaid Princess (Valkyrie Crusade)
  • Mermaid (Valkyrie Crusade)


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