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Anime and Manga
- Merpeople in A Centaur's Life naturally evolved from aquatic primates and are fully mammalian.
- Interestingly, their tail starts from about the knees down, so they still have thighs.
- Deadline Summonner has a Scylla in Mamoru's harem. For those who don't know, a Scylla is a half-human monster with the lower half of an octopus. She's rather attractive.
- The mer-folk in the anime adaptation of The Little Mermaid are also dolphin-tailed.
- Neptina, the mermaid from Marine Boy, is half-dolphin.
- One Piece is full of this with a lot of the Mer-people and Fishmen (which are a different species than the Mer-people, but can interbreed). Arlong is a saw shark, Hat-chan is an octopus and Chu is an archerfish, though.
- Sea Princess Azuri is about an orca "mermaid" engaged to an eel "merman". Other characters included shrimp and catfish.
- The titular character of Squid Girl is half-human half-squid, but averts the "human upper half, fishy lower half" part of the trope. Instead, she wears a hat shaped like the top end of a squid and her hairlocks are the tentacles. Oh, and ink comes out of her mouth when she sneezes or pukes.
- The raiders in the first episode of Those Who Hunt Elves.
- Tokyo Mew Mew has Mew Lettuce, who has a finless porpoise mermaid form.
- Batman 1989 has fought Orca, a woman who transformed herself into a humanoid killer whale. Though in early appearances, she just wore a bizarre killer-whale biomechanical outfit, the logistics of which made little to no sense even in the DC Universe.
- Korilia, from the first ElfQuest: Wave Dancers series, was a similarly-designed octopus-mermaid.
- A story called "Cilia" in a 1974 issue of Vampirella featured an octopus-mermaid of the "tentacles instead of legs" variety.
- Triton the Inhuman in the Ultimate Universe is more fleshy cephalopod based than his scaly mainstream counterpart.
Films — Animated
- Ursula of The Little Mermaid is half octopus, a form of mermaid known as cecaelia. Her sister Morgana is the same, though she is much skinnier with green skin while Ursula is more full figured with purple skin.
- Some of her concept sketches had her as part Scorpionfish, a somewhat unusual choice for fish halves.
Films — Live-Action
- One of the Dark Lord of Dirkholme books had Dirk, the titular Dark Lord, speculating on creating a mermaid daughter with his wife (long story, but "Dark Lord" is just his day job, and he's more of a mad scientist in his spare time).
- As are the mer in John Ringo's Emerald Seas, though the cover would have you believe otherwise
- From Harry Potter, Victor Krum transfigures himself partially into a shark.
- While Their Mermaids Are vaguely squiddish.
- The Mer in Helen Dunmore's Ingo series are closer to half seal than anything else.
- Aquatics in Dougal Dixon's Man After Man eventually evolve into this.
- The Mirra from Alida Van Gores Mermaid's Song are similarly half-human, half dolphin, as were several mermaids created by L. Sprague DeCamp.
- Vonda N. McIntyre's "divers" are, quite simply, humans genetically engineered for aquatic life. Her historical fantasy novel The Moon and the Sun has the similar (if naturally-occurring) "sea people." Both are entirely mammalian.
- Marguerite de Lubert's 18th century Fairy Tale novella Princess Camion involves the protagonist, Camion, being turned into a half-human, half-whale as per a curse.
- The mermaids in the River of Dancing Gods series are all-mammal, with their "fish" half most closely resembling a dolphin.
- The Cray in China Miéville's The Scar are essentially lobster-bodied centaurs.
- Nereus from The Secrets of the Immortal Nicholas Flamel has eight octopus tentacles (a la Ursula) instead of a tail.
- The mermaids of Barracora, an unconventional blend of humans and fish with smooth skin.
- In Changeling: The Dreaming, the Merfolk are composed of several different types. Kithain Merfolk are divided into different Houses based on various vertebrate sea creatures. Scaled fish are only a single house (albeit the largest), while sharks, eels, and rays are another, and air-breathing creatures like whales, reptiles, and dolphins are another, the last of which are most well-known to humans due to their interactions with them. Thallain Merfolk, on the other hand, are composed of the myriad of seagoing invertebrates.
- Dungeons & Dragons 3e had darfellans, based off of killer whales.
- The Mystara setting is home to the kopru, a race of aquatic mind-controllers with Cthulhumanoid faces, slick eel-like bodies, and triple-finned tails that end in nasty ripping hooks.
- Pathfinder has cecaelias, another race of Ursula-style octopus-merfolk. (The name of the species is a common modern term for such beings, believed to have been inspired by the Vampirella example.)
- It also has the grindylows, an aquatic aberration that is essentially a goblin doing the octopus-merfolk thing. Though not officially "goblinoids", they do share the same general mentality, though they hate and fear squids rather than horses and dogs. For reasons that should be obvious.
- Planescape had the zoveri, a race of celestials who are octopus-mermaids as per Ursula.
- Yu-Gi-Oh! has Mermail Abyssdine (sea slug), Mermail Abysshilde (Eel), and maybe Mermail Abyssmander (Salamander).
- BIONICLE's Barraki are based on creatures such as crabs, sharks, cephalopods, eels, and stingrays.
- Cute Knight Kingdom has the Prince of Eels.
- Captain Anne Sirena of Endless Frontier is a mermaid with an orca's fin. Worth noting is that only the women of her species are unscaled; the males are Fish People. And much to Haken's embarrassment, the women like scales on their men.
- Kraken in Final Fantasy III. Unlike his more sea-creature like brethren from Final Fantasy I and Final Fantasy IX, this guy is half man, half octopus.
- The heroes of Kingdom Hearts use this whenever they visit Atlantica. This is the trope image. The only exception is in Chain of Memories, where they simply walk around the ocean floor.
- Hydro Girl in Ratchet: Deadlocked is a sea creature, though her species name is unconfirmed. She partly looks like a mermaid.
- The Team Fortress 2 fandom gives us Tentaspy.
- The SCP Foundation have one of those who appears somewhat half-dolphin.
- Orkazoka, one of the Kaiju Girls of Neo Monster Island, associated with Twisted Kaiju Theater, is apparently based on the killer whale.
- Mermaid's Tail Galleries has galleries of mermaids based on mollusks & starfish amongst even weirder things (motorcycles? furniture? lawn mowers?)
- This lovely eel girl may be a somewhat bizarre case.
- The Decapodians in Futurama are vaguely crustacean humanoids, with elements of crabs, lobsters, prawns, fish, squid, and anything else they could think of.
- The My Little Pony: Friendship Is Magic fanbase has given us both Seapony Lyra, which is popular enough to have spawned unofficial merchandise, and Octaviapus. They're typically portrayed as friends except for when they're still put with Bon Bon and Vinyl Scratch, respectively.
- The Street Sharks