Kitsune, most instances of which will fall under this trope. Doesn't have anything to do with Twin Tails.
Examples:Anime and Manga
- Kuro the demon cat from Blue Exorcist has two tails of the split version.
- In Naruto, there are nine tailed beasts, with the Kyubi no Yoko, his real name Kurama, being the strongest of the nine. Each was a creation of the primordial Ten-Tailed beast which was created by Kaguya Otutsuki to retrieve her chakra from her sons.
- Moro, the female Wolf God that raised San in Princess Mononoke had a two-pronged split-tail.
- Yami to Boushi to Hon no Tabibito stars two kitsunes, one with nine tails and one with just three.
- King Ghidorah, who appears in several Godzilla movies. He has two long tails (and three heads).
- Slattern of Pacific Rim possesses three main tails and several much smaller ones. They're prone to twirling at high speeds to mislead adversaries before striking.
- The Zipplebacks from How to Train Your Dragon.
- The Harry Potter universe has (as mentioned in Fantastic Beasts and Where to Find Them) the Crup, which resembles a Jacky Russel apart from its forked tail. They normally have the ends clipped in order to preserve The Masquerade.
- "Scraps", the Frankenstein's Monster of a Big Friendly Dog created by Igor in Carpe Jugulum.
Nanny Ogg: He's as happy as a dog with two ... oh, he does have two tails.
- In the Dragonriders of Pern series Pernese dragons have forked tails.
- Korean drama My Girlfriend Is A Nine Tailed Fox, in which case the eponymous girlfriend is a magical nine-tailed fox spirit taking human form.
- The Seth Animal, the creature that the Egyptian god Seth is supposed to have the head of, has a forked tail.
- Youkai especially are known for having multiple tails, the most famous example being the Kitsune, which is depicted with up to nine tails. The Nekomata is another commonly portrayed multi-tailed youkai, which has the appearance of a two-tailed cat. Aside from the Nekomata and Kitsune, there are other Youkai with multiple tails. The Isonade is a giant shark with three tails (one larger and barbed), the Orochi is a giant serpent with eight (or possibly infinite) heads and sometimes the same number of tails, and the Raiju, or Thunderbeast, is depicted as various animals, sometimes described with multiple tails. One particularly powerful nekomata is described as having seven tails rather than two, a result of its great age.
- It appears even in Europe, in The Brothers Grimm story Mrs. Fox Mr. Fox has nine handsome tails. When he fakes his death to test his wife's faithfulness she turns down several suitors with increasing numbers of tails before accepting one who also has nine tails, then Mr. Fox crashes Mrs. Fox's would-be second wedding.
- Dungeons & Dragons. The demon lord Demogorgon has two tails. The Warped Beasts also have multiple, flail-like tails.
- In Kitsune: Of Foxes and Fools the players are Kitsune (duh) who are awarded additional tails by the kitsune elders for tricking sinful mortals. The first one to get nine tails wins.
- "Twin Tailed" is a possible morphism in the furry sci-fi RPG Hc Svnt Dracones, it's considered one of the more "attractive" morphisms and many Vectors have tails surgically added to mimic them. In fact it's so common among Canidae that true twin tails are assumed to have had surgery and take a social penalty among their own kind.
- Magic: The Gathering. The first generation of Slivers possessed a serpentine body that split into two or more prehensile tails. In their latest appearance, said tails appear to have evolved into legs. Their new humanoid shape comes as a bit of a shock, but considering their predilection for spontaneously sprouting all manner of extra appendages, legs are small time.
- While mutated rather then supernatural, the Hellhound Action Girl Surama from Wurr has two tails.
- In El Goonish Shive, Grace's omega form is a three-tailed squirrel-girl.
- Many species in Pokémon have multiple tails, such as Vulpix (six), Ninetales (obvious), Tauros (three). Espeon has a forked tail with two tips, as do Uxie, Mesprit, and Azelf. Buizel and Floatzel have two (they even use them as propellers), as well as Ambipom, Electivire and Meowstic. There are also some ambiguous cases such as Grovyle (which has branching fern leaves for a tail) and Suicune (which has two ribbons for a tail).
- More like 'Multiple Tailed Badass Adorable', but Miles "Tails" Prower in the Sonic the Hedgehog series has two tails, and frequently uses them to helicopter around. As a nod to folklore concerning Japanese kitsune, he is the smartest character in canon and employs lots of transforming or disguised machinery as weapons and transportation.
- In the video games of Harry Potter, there are several references to the Gytrash, which are ghostly dogs with forked tails. The gytrash is a creature in English folklore, though only the Harry Potter games describe it with a forked tail.
- Touhou, with its focus on youkai, unsurprisingly has this. There are Ran, a nine-tailed kitsune, Chen, a twin-tailed nekomata, and, somewhat oddly, Orin, a kasha, who looks just like a nekomata despite the fact that they're mythologically unrelated.
- League of Legends has Ahri, the Nine-Tailed Fox. Her lore is clearly inspired by the Gumiho (Korean version of the Kitsune mythology).
- Chimaeras, the two-headed dragons(?) from Warcraft III also have two tails. This partially helps to differentiate them from their Draenor counterpart in World of Warcraft, the Rylak.
- Very rarely, animals are born with extra limbs, tails included. For example, here's a twin-tailed cat found in Canada.