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The act of drawing a female character with unusually large and buoyant breasts and without a bra, then animating every individual jiggle, sway, bounce and bobble they undergo.
The motion so displayed is typically asynchronous -- each breast is animated separately and possesses its own individual movement.
Also used to describe the movement itself.
The term was coined by fans some time before 1993 and makes reference to the anime production Studio Gainax, many of whose earlier releases made use of this particular variety of Fanservice. According to a Usenet post from 1993, one particular busty young thing from the Gainax anime Otaku No Video inspired a tongue-in-cheek unit of measurement for Gainaxing: one full bounce is apparently equal to one " Misty May".
For the video game version, which isn't limited to Japanese games, see Jiggle Physics.
Examples:
Anime
- Cowboy Bebop has the character Faye Valentine, who is breathtakingly beautiful with gigantic pneumatic bosoms that seem to have minds of their own. She also almost invariably dresses in a manner that would, in any American city in the late 20th Century, cause everyone who saw her to conclude immediately that she is a streetwalker. Perhaps she bought all her clothing at the Dirty Pair's garage sale.
- Gunbuster (called "Bustgunner" by some fans) and Otaku No Video from Gainax are the two productions which allegedly inspired the term.
- Just about any female character in the various Burn Up animes.
- Mune-mune in Gainax's Abenobashi Mahou Shoutengai is a deliberate parody -- right down to her name, which actually translates as "Tits-Tits".
- Kurono Kurumu in Rosario To Vampire. The movement of her breasts even produces audible sounds!
- And in episode 4, Kurumu's fat stalker (or rather, his belly) too.
- Every female character that appears in the various Ranma 1/2 motion pictures -- even the ones who are supposed to be small-breasted. This contrasts with the main series where they never seem to move at all, since the show is kind of old and didn't have a huge budget.
- Mai Shiranui from the Fatal Fury series. The Fatal Fury movie, in particular, was infamous for the animators actually showing (very, very briefly) the inevitable wardrobe malfunctions her Gainaxing would cause in her distinctive costume during fight scenes. Viz Video, who released Fatal Fury in the U.S., used to show her bouncing in the trailers while the narrator made enthusiastic reference to "dual-independent-suspension ninja girl Mai Shiranui". Although her design in the first few games was relatively more conservative, the anime (and the 2D Jiggle Physics in the King Of Fighters videogames) resulted in her Flanderization into a walking incarnation of this trope.
- The sheer quantity of gainaxing found in the anime Plastic Little inspired ADV, the North American distributor/dub house, to include an on-screen "Jiggle Count" meter as one of the special features in their DVD release.
- The anime Godannar takes Gainaxing to the extreme, since even the mecha have breasts (and in one particular case, both the mecha and the pilot have humongous jiggling breasts).
- Taeko and a few others in Ai Yori Aoshi.
- Practically every female role in Divergence Eve and its followup. It may be noted that outside of this and the Fanservicey opener and closer, the series is remarkably serious in tone and tells its story in blissful, perhaps defiant ignorance of the laws of physiology, if not physics, being broken in the character designs.
- Caldina in Magic Knight Rayearth.
- Virtually any adult female in Mamono Hunter Yohko
- The opening credits of Landlock.
- While not exactly as flagrant, Murrue Ramius of Gundam SEED has the dubious honor of having her bouncing chest be one of the few whose bouncing was actually animated and used as Stock Footage every time the Archangel took a particularly nasty hit in battle. This seemed to be limited to her, until first officer Natarle Badguirel ended up in command of her own ship, whereupon she gained the suddenly bouncing breasts (albeit not as dramatically given her modest proportions), as did Flay Alster as part of her crew. Whether this is actually an accurate depiction of how breasts move in zero gravity is debatable.
- Yoko, and Kittan's three sisters (who come in small, medium and large for your viewing pleasure) in Tengen Toppa Gurren Lagann. Guess who it's made by. In fact, the English trailer for Gurren Lagann contained the words 'that famous Gainax bounce'.
- Mikuru Asahina, the moe moe character in Suzumiya Haruhi No Yuutsu, displays Gainaxing, particularly in the opening credits.
- Rushuna Tendo, every episode of Grenadier. However, as she keeps her ammo in her cleavage, this is actually somewhat practical. The Big Bad Setsuna, being similarly well-endowed and trained, does the same thing.
- The AMV "The Fanservice Video: Bouncing Back For More
" by Zarxrax is dedicated to this effect.
- Almost every female character in the anime Girls Bravo.
- Naga the White Serpent, from The Slayers.
- Angela, an American visitor to Genshiken displays this conspicuously (complete with bouncing sound effects) to make the differences between Japan and America (or at least Eagleland) more obvious, and to highlight her more upfront attitudes about sex (she is an unashamed Yaoi Fangirl).
- A certain animation team in the rotation for Digimon Savers used this technique on Rosemon, and it's probably not a coincidence that they animated BioLotusmon's only appearence.
- Siesta from Zero No Tsukaima, pictured above. You're probably not looking at the Love Bubbles surrounding her.
- Mai from Mai-HiME dresses conservatively, but her somewhat large (but not Gag Boobs-level) chest still has a bit of bounce to it. A scene early in the anime replicated during an argument with Yuuichi and Shiho gives them an audible "boing". According to supplemental materials, it's not even Mai who has the largest bustline...she's beaten out ever-so-slightly by Haruka, who doesn't have a whole lot of bounce, but still looks good in a swimsuit.
- Macross Frontier features a whole raft of characters with sufficiently Gainaxed breasts, including Sheryl and the Miss Macross Frontier contestants (which makes Ranka uncomfortable.)
- Interestingly the show also subverts the trope slightly: when a fully-sized, thirty-foot-tall Zentraedi, Klan Klein has a rather terrifying bust that may actually be capable of killing a normal-sized human. Micronized, however, she doesn't possess anything that can be Gainaxed.
- R.O.D. TV had one particularly infamous chase sequence where Nenene finally finds her long lost friend (love?) Yomiko Readman. Yomiko runs away and Nenene gives chase. As they sprint, their bosoms (which had been largely still until then) bounce and sway like jello earthquakes.
- It's also worth noting that Yomiko's bustline went from a mild C-Cup in the OVA well into DD territory for the TV series, set several years later. A late blooming?
Western Animation
- Jessica Rabbit from Who Framed Roger Rabbit. Her breasts were purposely drawn to bounce in the opposite rhythm of a normal female's chest while walking; she bounces down when a real person would bounce up, and vice versa.
- World renowned cartoon sex idol Betty Boop was also known to do this in certain cartoons.
- Tiny Toon Adventures seemed to have a little fun animating a female anthro bear character this way in one episode. No Seriously, I Am Not Making This Up. Here's proof.
- Well she's making fun of vapid, sexed-up MTV stars, so it wouldn't have worked without this.
- Pfft, Fuddonna was much more bizarre than the Gainaxing going on.
Live Action TV
- Allo Allo- let's just say "vibrating ice cream truck".
- The Bill- a couple of incidents described as "Bouncy Bouncy Jo Masters".
Video Games
- Soul Calibur II's Jiggle Physics...
- Three words: Dead Or Alive. Three more words: Xtreme Beach Volleyball. The breast movements were synchronous until Dead or Alive Xtreme 2, when they consequently lost any resemblance to actual bosoms.
- Odin Sphere. It's especially obvious when playing as Velvet, and even more obvious when battling the Queen of the Dead. It doesn't help that Velvet's particularly Stripperiffic to boot.
- Super Robot Wars does this rather extensively, despite being a video game, all the bounces come from the anime-ish cut-in pictures. Very prevalent in the Alpha series, whereas you can expect any original female characters to have Gainaxing bounce. Unless your name is Ibis Douglas.
- This also gets carried over to the latter handheld SRW games, such as J and W. (Un)fortunately, Original Generations somewhat mellowed or stopped this practice.
- Queen Valentina from the original Super Mario RPG had a conspicuously long after-hit animation that consisted solely of her flinching and jiggling for a few seconds.
- The anime line-up already told you: Mai Shiranui. That is all.
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