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Anime and Manga
- Not the mermaids themselves, but the Panthalassa race in Mermaid Melody Pichi Pichi Pitch is composed of these. Most of them, however, don't have a choice but to live underwater (until the seal on their civilization breaks, that is), and we only see a few of them, many of whom we're supposed to assume are human until we realize that they've survived instances where they should have drowned. They also have nebulous, unexplained superpowers and Creepy Cool Crosses. Huh.
- The merrows of Berserk have the ability to shift from a more traditional mermaid body to a fully humanoid form that's capable of walking on land and having children with human men. This is how a lone island girl named Isma was conceived. And it turns out that Isma is herself a merrow who's capable of switching between both forms.
- The Ragnans of Macross Delta, who have shark-like gill slits on the base of their necks, webbed hands and feet, and fins on their elbows and calves.
- The people of Shioshishio in Nagi-Asu: A Lull in the Sea look exactly like regular humans except for ocean-blue eyes and a nearly-invisible scaly skin coating that allows them to breathe underwater. They can breathe out of water equally well, but have to periodically soak in seawater so their skin doesn't dry out. Despite the fact that the mer-people and land-dwellers look nearly identical, Fantastic Racism abounds in both directions.
- The plot of the anime movie Coral Reef Legend: Elfie of the Blue Seas has main protagonist Elfie as one of these and the last of her kind, as all her people were exterminated years ago.
- Squid Girl, arguably, since when she isn't manipulating things with her tentacles, she appears to be a normal girl with a Nice Hat and a weird hairstyle.
- Umi Monogatari is the story of two sea elves (elves with pointy ears and internal gills, but otherwise human) who take a trip to an island to return a ring. They aren't spotted as mermaids at all, which causes... problems.
- DC Comics has Aquaman, Aqualad, and their kin. Somewhat of a mixed example, as Atlantis also includes more traditional mermaids (Lori Lemaris) and others (Lagoon Boy, Blubber) who are animal/sea-life mixtures.
- Marvel Comics has Namor the Sub-Mariner, who has slightly pointy ears and wings on his feet as he can also fly, but looks much closer to human than fish.
- Namor's people also normally have blue skin, but he's half-human and a mutant to boot (hence the wings which are not natural to either side of his lineage).
- The Top Cow comic Fathom is about a member of a race of water-based humanoid Elemental Shapeshifters who have this among their abilities.
- The Aqualanians from Swordquest: Waterworld, a race of undersea merpeople; aside from their yellow-green skin and green hair, they look like humans (complete with legs) and are capable of breathing air.
- In Cavewoman: Deep Water, Meriem fights an apparently human merwoman (albeit one with an unusual skin tone if the cover is to be believed). Her exact motivations are murky, and a rematch in the future seems likely.
- At the end of Splash Allen becomes one of these so he can be with the more typical mermaid love Madison.
- There's an old Soviet romantic sci-fi film called Chelovek-Amfibiya (The Human Amphibian), in which an oceanologist's son with sick lungs was given additional implants derived from the gils of a young shark. He can survive on land, but mostly sticks to the sea, where he's more comfortable with breathing. The main plot point of the movie is the gradual deterioration of his ability to breathe atmospheric air and the need to forever leave dry land and live purely in the sea.
- The Mariner in Waterworld, played by Kevin Costner, has gills behind the ears.
- The titular character of Percy Jackson and the Olympians what with him being a demigod son of Poseidon and all.
- The Secret of Platform 13 has Melisande, a merrow who is proud of having feet and continually points them out, for some reason touchy about the idea that people will mistake her for a mermaid.
- The rifters from Peter Watts' Rifters Trilogy are modified humans (cybernetics and genetic engineering are used) who can survive in deep sea conditions. In fact, they prefer the sea to staying in their confined Underwater Base.
- Electra of the Not Quite A Mermaid series. Justified Trope - she was born human, but was found after a storm by merfolk and given magical sea powder so that she could breathe and live underwater.
- Aquiliton by Maureen Myers features two kinds of merpeople: the traditional kind with fish tails and ones who completely resemble humans and can breathe air, but they'll dry out and die if they stay on land too long, and tend to have pale skin and big feet. Also, females develop a sort of charm power during puberty that is replenished by moonbathing. The human-appearing merpeople can interbreed with humans, but their offspring usually die young.
Live Action Television
- The Man From Atlantis is another example. The only indication of his nature was webbed hands.
- The titular heroine of Ocean Girl looked fully human.
- In later seasons of seaQuest DSV, the character Tony Piccolo is a human who was modified with gills along his sides (and probably Required Secondary Powers to allow him to survive deep-sea pressure) but otherwise looks completely normal.
- In The Outer Limits (1995) episode "The New Breed", a scientist is injected with nano-robots who "correct" his cancer and myopia. When he and his friend test the limits of the robots abilities, one of the tests is to see how long the man can stay underwater. The nano-robots misinterpret this by giving the man gills so he can breathe, seriously squicking him out.
- An episode of Dark Angel had a couple of transgenics who looked perfectly human, except for the gills coming out of their backs and their inability to speak. They also laid eggs.
- Mako Mermaids: An H2O Adventure is mostly about these.
- The third season of Mighty Morphin' Power Rangers introduced the Alien Rangers, a race called the Aquitians who lived on an ocean planet. As far as their appearance goes, they were more Rubber-Forehead Aliens who spoke with voices that sounded like they were put under an underwater distortion filter.
- The oceanids, nereids, and naiads of Classical Mythology look entirely human, though perhaps more beautiful than mortals.
- This is the typical form of mermaids in the Arabian Nights and other Middle Eastern folklore; the only difference between them and land-dwelling humans is that they (and in one story, their children with humans) can breathe underwater.
- Selkies of Faroese and Scotirish folklore wear a sealskin as a wetsuit and take human form when they shed it. The Faroese story "The Seal Wife" is about a man who steals a selkie woman's wetsuit and locks it up so that she can't go back to the sea.
- The Stormwrack source-book for Dungeons & Dragons 3.5 has aventi, who, in a justified version of this trope, are actual aquatic humans. They were once a great empire who sunk beneath the waves during a cataclysm, but their god mutated their bodies to be able to survive underwater. Apart from a few distinct features, such as unusual colored hair and skin tones, and fins on their wrists and ankles, they are pretty much identical to humans, and the book explicitly states they can easily disguise themselves as such.
- Traveller: The Nexines who actually are human merfolk. They are a race genetically engineered for underwater mining.
- Their name too is like the name Nexie which is a kind of water fay.
- Naiads in The Witcher. They walk literally naked (yes, right in the game, with all the details), have greenish skin and dark green hair (yes, pubic hair too), but otherwise absolutely human. Dryads and Lady of the Lake closely resemble them in appearance, except that Lady's best parts are covered with her long hair.
- In Tales of Legendia there's the Ferines, an aquatic race that looks perfectly human despite the fact that they evolved completely underwater; their planet had NO dry land until humans from space came and raised it from the ocean.
- Aquaria has Li become this shortly after Naija finds him. It's a handy side benefit of your Fish Person girlfriend having magic powers, though it might only work if they're in close proximity — Li puts his old diving helmet back on if Naija decides to leave him behind somewhere. Their son might also count.
- In Soul Nomad & the World Eaters, the Nereids are a pretty clear example with a female One-Gender Race bonus as well. There are some minor differences, though; they have blue skin and hair, and small breasts so as to swim through the water better. They also have to mate with humans (or possibly Sepp, this isn't ever made clear) to produce offspring, too. Their leader is a more traditional mermaid, but this is never given an explanation.
- The Inklings from Splatoon look mostly human while they are not on squid form; the only things that make them stand out are pointy ears, unnaturally-colored hair that looks like tentacles and three fangs in their mouths. Unlike most examples in this trope, however, Inklings can't swim in water, they can only go through ink.
- SpongeBob SquarePants gives us Mermaid Man and Barnacle Boy, parodies of Adam West-era Batman and Robin. The show eventually explained that they ARE normal humans. The starfish Mermaid Man wears on his face magically keeps him alive and was a gift from some friendly mermaids (ergo the name.) Likewise, Mermaid Man gave Barnacle Boy the ability to breathe water....by forcing him to ingest a bunch of barnacles.
- Marina and her people (all of whom are mute) from Stingray (1964).