"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, Fish Physiology, and Human Physiology. Not to be confused with Fish People Physiology.

Also Called

  • Merfolk Mimicry
  • Merkind Mimicry/Physiology
  • Mermaid/Merman 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.



Merfolk Types



  • 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.


  • Mermaids/Mermen (Folklore/Mythology)
  • Jiāorén (Chinese Mythology)
  • Tritons (Greek Mythology)
  • Ningyo (Japanese Mythology)
  • Sea Deities (Mythology)
  • Selkie (Irish, Scottish, Faroese, and Icelandic folklore)
  • Merrow (Irish Mythology)
  • Iara (Brazilian Folklore)
  • Camila/Iara (Invisible City)


  • Merna the Merhog (Adventures of Sonic the Hedgehog)
  • Mermando (Gravity Falls)
  • Mermaids (Adventure Time)
  • Rainbow Cove Mermaids (Barbie: Dreamtopia)
  • Amphitrite (Hercules: The Animated Series)
  • Poseidon (Hercules: The Animated Series)
  • Triton (Hercules: The Animated Series)
  • Mer-Pups (PAW Patrol)
  • 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 (Voltron: Legendary Defender)
  • Merpeople (Winx Club)
  • Merpeople (Tara Duncan)
  • Alim Coelacanth (Teenage Mutant Ninja Turtles 1987 TV series)
  • Dyris (Xiaolin Showdown)
  • The Mer-Boy (Rupert the Bear)
  • Sirenas (Elena of Avalor)
  • Mermaid Pirate (Rise of the Teenage Mutant Ninja Turtles)


  • Merpeople (DC Comics)
  • 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)
  • Aquamarine (Aquamarine)
  • Nereid (Fishtales)
  • Siu May (Mermaid Got Married)
  • Mermaids/Mermen (Mermaids)
  • Mermaids (Peter Pan)
  • Merpeople (Pirates of the Caribbean)
  • Barnaby (Sabrina Down Under)
  • Finn (Sabrina Down Under)
  • Madison (Splash!)
  • Lily (Magic Island)
  • Cody Griffin (The Thirteenth Year)
  • Cody's mother (The Thirtheenth Year)
  • Shan (The Mermaid)
  • Merpeople (Barbie: Fairytopia)
  • Merpeople (Barbie: The Pearl Princess)
  • Merpeople (Onward)
  • Merpeople (Barbie In a Mermaid Tale)
  • Mermaids (Barbie And The Secret Door)

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 (No Pizza After Midnight)
  • Gooby (Planet Dolan)
  • Snoopy (Planet Dolan)


  • Merkinds (Arkwell Academy)
  • Merfolk (Geronimo Stilton: The Kingdom of Fantasy)
  • Merpeople (Harry Potter)
  • Mermaids (Island of Fog)
  • Mermaids (Peter Pan)
  • Mermaids (Shadowhunter Chronicles)
  • Merpeople (The Chronicles of Narnia)
  • Mermaids (The Gryphon Chronicles)
  • Naiads (The Gryphon Chronicles)
  • Merfolk (The Spiderwick Chronicles)
  • Mer (The Waterfire Saga)
  • Merpeople (The Little Mermaid)

Live Television

  • 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)
  • Marina Aguas (Marina)
  • Ariel (Once Upon A Time)
  • Ursula (Once Upon A Time)
  • Mermaid of Kinkow (Pair of Kings)
    • Mikayla Makoola; formerly
  • Shim Cheong/Se-Hwa (The Legend of the Blue Sea)
  • Madison Rocca (Power Rangers Mystic Force); via Mystic Mermaid form
  • Urara Ozu (Mahou Sentai Magiranger); via Magi Mermaid form
  • Andrew's mother (Round the Twist)
  • Merpeople (Siren 2018)
    • Ryn
    • Donna
    • Levi
    • Katrina
    • Sarge
    • Cami
    • Eliza
    • Viv
    • Hunter
    • Mate
    • Hope
    • Tia
    • Yura
    • Robb Wellens


  • 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)
  • Lulala Heine (Monster Girl Doctor)
  • Mermaids (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)
  • Oktavia von Seckendorff (Puella Magi Madoka Magica)
  • Golden Darkness (To Love-Ru)
  • Wakasa (Merman in My Tub)
  • Husky (Anima+)
  • Haruka Nanase (Free!); via 2nd ending
  • AncientMermaidmon (Digimon)
  • Mermaimon (Digimon)
  • Neptunemon (Digimon)
  • Laura (Tropical-Rouge! Pretty Cure)


  • 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

  • Leia (Harvest Moon)
  • Yae (Mystical Ninja)
  • Splash Woman (Megaman)
  • Pia (Rune Factory)
  • Mermaid (Valkyrie Crusade)
  • The Marai (League of Legends)
  • Rivershaper (Legends of Runeterra)
  • Mermaid Princess (Valkyrie Crusade)
  • Delphinus (Valkyrie Crusade)
  • Ruriera (Valkyrie Crusade)
  • Mermaid Tetra (Valkyrie Crusade)
  • Seleya (Valkyrie Crusade)
  • Havfrue (Valkyrie Crusade)
  • Merrow (Valkyrie Crusade)
  • Gill Grunt's Mermaid girlfriend (Skylanders)
  • Marino the Merman (Bust-a-Move 4)
  • Mermen (Battle for Wesnoth)
  • Cala Maria (Cuphead)
  • Mermaid (The Sims series)
  • Mermaidyn and Mermadonna (Yo-kai Watch)
  • Mermother (Yo-kai Watch)
  • Sora (Kingdom Hearts)
  • Mermaid (Starfy)
  • Serilly (Puyo Puyo)




Live Television/Movies



Video Games


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