"I ran into them once when I was a whaler. They may be more beautiful than any woman you have seen, but they are as vicious as a blood-hungry shark! I know. I was the only member of my crew to survive."
― Eight-fingers Oba, Heroes of Might and Magic IV, "The Strait of the Lost"

The power to use the abilities of Merfolk. Variation of Mythic Physiology, Hybrid Physiology, and Fish Physiology. Not to be confused with Fish People 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), a being with the upper body of a humanoid and the lower body (in taur-style) of a sea animal/creature (mainly 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 act as Immortality Bestowal, 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.
  • Ability to remain out of water varies: some are completely unable to breathe air and begin immediately suffocate out of water, others are able to breathe air but need to stay wet to avoid drying, and others being able to stay on land for prolonged periods of time with little to no ill effects.
  • Scales and skin may dry when overexposed to the Sun or artificial heat, such as fires or heaters.
  • May be vulnerable to certain diseases.
  • Lack of legs may pose locomotion difficulties on land: some are able to change between legs and fins, others cannot and are stuck with a tail even out of water.
    • The "non-changers" vary in their ability to move on land, some can move upright relatively normally walking/hopping on tailfins, others slither upright across land and some have to drag themselves/crawl on ground.

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)
  • Mer-Pups (PAW Patrol)
    • Mama Mer-Pup
    • Baby Mer-Pup
    • Skye, Zuma, Rocky & Marshall; one off
  • Mermista (She-Ra: Princess of Power)
  • Sofia the First (Sofia the First); via Amulet of Avalor
  • Merpeople (Sofia the First)
  • Sirena Von Boo (Monster High)
  • Meeshell Mermaid (Ever After High)
  • Merpeople (Jake Long: American Dragon)
  • Merpeople (Winx Club)
  • Merpeople (Tara Duncan)
    • Aquaphonis
  • Alim Coelacanth (Teenage Mutant Ninja Turtles 1987 TV series)
  • The Mer-Boy (Rupert the Bear)


  • Merpeople (DC Comics)
    • Lori Lemaris
    • Ronno the Mer-Boy/Manno the Mer-Man
  • Mer-People (Marvel Comics)
  • Mermaid (Marvel Comics)
  • Guy Guppy the Man-Mermaid (Babe, Darling of the Hills)
  • Iqula of Tritonis (Aquaman)


  • Merpeople (Disney's The Little Mermaid)
    • Ariel
    • Triton
  • Aquamarine (Aquamarine)
  • Nereid (Fishtales)
  • Siu May (Mermaid Got Married)
  • Mermaids/Mermen (Mermaids)
    • Diana
    • June
    • Venus
  • Mermaids (Peter Pan)
  • Merpeople (Pirates of the Caribbean)
  • Barnaby (Sabrina Down Under)
  • Finn (Sabrina Down Under)
  • Madison (Splash!)
  • Cody Griffin (The Thirteenth Year)
  • Cody's mother (The Thirtheenth Year)
  • Shan (The Mermaid)


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

Web Series

  • Radia, Apex and the Mer-people (Mermaid: Secrets of the Deep by 'Theekholms')
  • Guto, Pedro, Norato, Raique & Samuel (Vida de Tritao by 'Tritao P.H.')
  • Dart the Merboy (Webcomic "No Pizza After Midnight")


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

Live Action TV

  • Aryana Mendez (Aryana)
  • Princess Neptuna (Aryana)
  • Mermaids (Charmed)
  • Josephine as Dyosa Agua (Dyosa)
  • Merman Prince (Duyung Aridinata)
  • Dyesebel and other merfolk (Dyesebel)
  • Merpeople (H2O: 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
    • Charlotte Watsford
  • Marina Aguas (Marina)
  • Ariel (Once Upon A Time)
  • Ursula (Once Upon A Time)


  • Razette (07-Ghost)
  • Marina (Adventures of the Little Mermaid)
  • The Lorelei (Ah! My Goddess)
  • 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)
  • Celia (Rave Master)
  • Tamao Ichinose and the Swim Club (Rosario + Vampire)
  • Mermaids (Shinkaigyo no Anko-san)
  • Golden Darkness (To Love-Ru)
  • Wakasa (Merman in My Tub)
  • Husky (Anima+)


  • Merfolk (Dungeons & Dragons)


  • Merfolk (Magic: The Gathering)
  • Amazon of the Sea (Yu-Gi-Oh!)
  • Cure Mermaid (Yu-Gi-Oh!)
  • Deepsea Diva (Yu-Gi-Oh!)
  • Enchanting Mermaid (Yu-Gi-Oh!)
  • Evigishki Merrowgeist (Yu-Gi-Oh!)
  • Guardian Kay'est (Yu-Gi-Oh!)
  • Ice Water (Yu-Gi-Oh!)
  • Ill Witch (Yu-Gi-Oh!)
  • Mermaid Archer (Yu-Gi-Oh!)
  • Mermaid Knight (Yu-Gi-Oh!)
  • Most "Mermail" monsters (Yu-Gi-Oh!)
  • Rainbow Marine Mermaid (Yu-Gi-Oh!)
  • Red Archery Girl (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)
  • Delphinus (Valkyrie Crusade)
  • Gill Grunt's Mermaid girlfriend (Skylanders)
  • Marino the Merman (Bust-a-Move 4)
  • Mermen (Battle for Wesnoth)




Live Action TV



Video Games