- Cats: Genkiness, excitability, occasionally irritation. Usually accompanied by a Cat Smile.
- Dogs: Hyperness, clumsiness, affection. Generally done to a character who is loving, but not all there in the head.
- Foxes: Mischief, wisdom, slyness. May be either friendly or malevolent.
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Anime And Manga
- Mimi and Kuro have been known to sprout bunny and cat ears, respectively, in Kodomo No Jikan. With Kuro, it can be hard to tell if it's a case of Hyperspace Ears or not, since she does occasionally wear a cat ear accessory.
- In Rurouni Kenshin, Megumi's Noblewoman's Laugh is occasionally accompanied by growing fox ears. Her nickname on the show itself is "Kitsune-onna" (literally "Fox Woman") or "Vixen" in the English version.
- The cursed characters in Fruits Basket sometimes take on characteristics of their animal selves in comedic situations:
- Kisa, the tiger-girl from, pops out her ears and tail at one point, when she perked up at hearing Tohru (her surrogate mother) come home.
- Kyo the cat will sometimes visibly bristle ears and tail up when angered, or flatten his ears when embarrassed.
- Hayama in Kodomo no Omocha occasionally sprouts leopard ears and tail when acting especially cool.
- And once, after Sana outright asks him to kiss her, he sprouts mouse ears, a mouse nose, and whiskers. Sana remarks in amazement that she didn't know "you could do mouse, too! I thought you only did leopard."
- Tamaki (who's basically a Genki Girl in a bishonen's body) does this with puppy ears once in a while in Ouran High School Host Club.
- Happens a few times with Hazuki in the first part of Tsukuyomi, before she gets into the habit of wearing a Cat Eared Headband. This was initially intended to be only an occasional gimmick, sometimes done with headbands and other times with this trope, until the Anime made it a central aspect of the entire design, and then went on to add cat ears to everything, with absolutely no exceptions.
- In the Descendants of Darkness anime series, Tsuzuki gets dog ears and a tail a few times when acting especially keetish. This has apparently lead some fans to think he can actually turn into a dog if they don't get the visual metaphor.
- Ichigo literally has her kitty features (ears and occasionally a tail) pop up when she gets excited or nervous in Tokyo Mew Mew. Later on, it accelerates to actually becoming an adorable kitten. Unlike others, this is actually canon, and a plot point, and also leads to a lot of awkward scenes of her having to stick her head in bushes or suddenly having to find a quick way to hide them.
- Yuzuriha in X1999 (especially when trying to cheer Kamui up) has pointy dog ears because her spirit animal is a dog.
- Shuuichi from Gravitation occasionally sprouts them, and at one point turns totally into a cat for comedic effect.
- Yuriko Oozura from Mao-chan. In the manga, she also has a Sprouting Tail.
- Ai Yori Aoshi: Aoi sprouts nekomimi (and a tail) when she's rolling around in Kaoru's bed.
- Hidamari Sketch: As a one-time thing, Sae sprouts cat ears and tail purely out of surprise/confusion when Yuno's dad angrily points at her and shouts "It's YOU!" as she walks in. (He mistook her as Yuno's boyfriend based on a stray hair he found in Yuno's room.)
- Lately in the Mahou Sensei Negima! manga, a number of the students use magic to sprout animal ears and/or tails in order to not be recognized on wanted posters. The sad thing is that it works.
- Sort of inverted with Kotaro. He really has dog ears which he is somehow able to hide in his hair.
- Hayate of Magical Girl Lyrical Nanoha had tanuki ears (and sometimes tail) pop up every so often during the StrikerS manga when she's feeling mischievous.
- All the Hounds in Petit-Hound have this, and no, it's not for comedic purpose.
- Liza Wildman of Princess Resurrection, is half werewolf. Besides her transforming forearms, her only wolf-like feature are her wolf ears that only pop up when she is embarrassed/annoyed, or listening intently.
- Ikeda Kana from Saki sprouts two cat ears whenever she has intimate interaction with Mihoko, complete with purring.
- In Hayate the Combat Butler, when burgers are mentioned around Machina, he sprouts what are likely dog ears and tail.
- When his master praises him or he's contemplating something trickstery, he gains fox/tanuki ears and a tail. And his alternate form is that of a giant snake.
- Hayate was trying to conceal an involuntary change in his appearance, and told Izumi that he had nothing to hide. (Probably) fox ears popped up and she began trying to pull away the cloak he was wearing.
- Nana has Nana K sprouting dog ears with some regularity. It's part of the origin behind her nickname Hachi.
- This occurs to a large amount of various characters in Alice Academy. It's more prevalent in the manga than in the anime.
- Katekyo Hitman Reborn!: Whenever Gokudera's really happy (usually because of praise from Tsuna) he grows doggy ears and a tail.
- In Hunter × Hunter Killua does this at least twice in the anime.
- Hiroki Komachi from Chu Bra grows cat ears and tail whenever he's nervous, which is the result from being surrounded by girls who deal with underwear on daily basis.
- Tsubasa Hanekawa of Bakemonogatari develops feline characteristics after being possessed by a 'meddlesome cat' who would take control after an accumulation of severe stress.
- Maron/Jeanne does this several times in the Kamikaze Kaitou Jeanne manga. Usually when thinking of Kaitou Sinbad.
- Tsumiki in Place to Place.
- Kyoko from 3-gatsu no Lion sprouts cat ears to show her excitability and affection toward Gotou.
- In Kotoura-san, from Haruka's point of view at least, Manabe's entire head often goes into werewolf-mode when he's feeling lustful.
- It occasionally happens to Yurine in Ano Ko ni Kisu to Shirayuri wo, especially when she is with the girl she loves, Ayaka.
- Played with in Nabari no Ou; when he's feeling mischievous, protagonist Miharu Rokujou frequently sprouts little devil wings and a tail. No ears, though.
- From Kagetsu Tohya, Len — the Really 700 Years Old Elegant Gothic Lolita semi-Horny Devil — is half cat, and thus would occasionally add Cat Girl to the list when surprised enough to pop out her fuzzy ears◊.
- In Little Busters!, Rin's angry sprite includes cat ears, while Kud's upset/hurt/flustered sprite has her with dog's ears and a tail.
- In Maji De Watashi Ni Koishinasai! Kazuko often sprouts dog ears when happy or depressed.
- In a 1930s Popeye cartoon, a Mae West expy is brazenly flirting with Popeye and smacking around Olive Oyl, who finally downs a can of spinach and momentarily sprouts cat ears while yowling and hissing!
- In the Bugs Bunny short "The Hare-Brained Hypnotist", after Elmer learns to perform a Hypnotic Gaze and tries it on Bugs, Bugs reverses the hypnosis and mind-controls Elmer into acting like a rabbit. Elmer's ears briefly grow into rabbit-like ears to set up a role-reversal scene.