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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. 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.
  • Scales and skin may dry when overexposed to the Sun or artificial heat, such as fires or heaters.

Known Users

See Also: Our Mermaids Are Different


  • Merna the Merhog (Adventures of Sonic the Hedgehog)
  • Mermando (Gravity Falls)
  • Amphitrite (Hercules: The Animated Series)
  • Poseidon (Hercules: The Animated Series)
  • Triton (Hercules: The Animated Series)
  • Merfolk (The Little Mermaid)
  • Bai Tza (Jackie Chan Adventures)
  • Mer-Pups (PAW Patrol)
    • Mama Mer-Pup
    • Baby Mer-Pup
    • Skye, Zuma & Rocky; one off
  • Mermista (She-Ra: Princess of Power)
  • Sofia the First (Sofia the First); via Amulet of Avalor
  • Alim Coelacanth (Teenage Mutant Ninja Turtles; 1987 TV series)
  • Winx Fairies (Winx Club); by evolving into their Sirenix transformation


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


  • Aquamarine (Aquamarine)
  • Nereid (Fishtales)
  • Siu May (Mermaid Got Married)
  • Mermaids/Mermen (Mermaids)
    • Diana
    • June
    • Venus
  • Mermaids (Peter Pan)
  • Sirena and the Mermaids of White Cap Bay (Pirates of the Caribbean: On Stranger Tides)
  • Barnaby (Sabrina Down Under)
  • Finn (Sabrina Down Under)
  • Madison (Splash!)
  • Cody Griffin (The Thirteenth Year)
  • Cody's mother (The Thirtheenth Year)


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


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

Live Action TV

  • Aryana Mendez (Aryana)
  • Princess Neptuna (Aryana)
  • Josephine as Dyosa Agua (Dyosa)
  • Merpeople (H20: Just Add Water/Mako: Island of Secrets)
    • Zac Blakely
    • Rikki Chadwick
    • Erik
    • Emma Gilbert
    • Bella Hartley
    • Lyla
    • Evie McLaren
    • Mimmi
    • Nixie
    • Ondina
    • Rita Santos
    • Cleo Setori
    • Sirena
  • Marina Aguas (Marina)
  • Ariel (Once Upon A Time)
  • Ursula (Once Upon A Time)


  • Razette (07-Ghost)
  • Marina (Adventures of the Little Mermaid)
  • Sirenoid (Bakugan)
  • Eve (Black Cat)
  • Mutio (Blue Submarine No. 6)
  • Aqua (Di Gi Charat)
  • Aria (Dog Days)
  • Aquarius (Fairy Tail)
  • Namiko (Ghost Sweeper Mikami)
  • Mermaid Princesses (Mermaid Melody Pichi Pichi Pitch)
    • Caren
    • Coco
    • Hanon Hôshô
    • Lucia Nanami
    • Noel
    • Sara
    • Seira
    • Rina Tôin
  • Meroune Lorelei (Monster Musume)
  • Lunar Edomae (My Bride is a Mermaid)
  • Sun Seto (My Bride is a Mermaid)
  • Mawari Zenigata (My Bride is a Mermaid); temporarily
  • All Merfolk (One Piece)
  • Stronami (One Piece:Mugiwara Theatre)
  • Tamao Ichinose and the Swim Club (Rosario + Vampire)
  • Mermaids (Shinkaigyo no Anko-san)
  • Golden Darkness (To Love-Ru)


  • Merfolk (Dungeons & Dragons)


  • Merfolk (Magic: The Gathering)
  • Cure Mermaid (Yu-Gi-Oh!)
  • Enchanting Mermaid (Yu-Gi-Oh!)
  • Mermaid Archer (Yu-Gi-Oh!)
  • Mermaid Knight (Yu-Gi-Oh!)
  • Rainbow Marine Mermaid (Yu-Gi-Oh!)
  • Sentinel of the Seas (Yu-Gi-Oh!)
  • Toon Mermaid (Yu-Gi-Oh!)

Video Games

  • Mermaimon (Digimon)
  • Leia (Harvest Moon)
  • Yae (Mystical Ninja)
  • Pia (Rune Factory)
  • Mermaid (Valkyrie Crusade)
  • Mermaid Princess (Valkyrie Crusade)




Live Action TV



Video Games


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