* ''VideoGame/{{Breakers}} Revenge'' has Maherl's hilarious [[http://www.youtube.com/watch?v=msa7tI7ngWQ BALLOON-O!]] attack, in which he inflates and attempts to slam his opponent into the ground.
* Creator/DataEast's ''Diet Go Go'' has food-based enemies that throw food at our exercise outfit-clad hero and heroine. One hit with projectile food makes you fat, two makes you obese, leading to instant death. Averted if the enemies touch you directly, which is also instant death. To boot, the entire game's premise is about an evil scientist who's spreading junk food around the world, making people obese.
* The classic arcade game ''DigDug'' involves inflating enemies until they burst.
* Cheng Sinzan from ''FatalFury'' already has a nearly spherical torso, but he can plus inflate himself with air during at least one of his attacks.
* ''VideoGame/FatPrincess'' is a downloadable real time strategy/action hybrid that has this as a strategic element. Fattening the princess up will make it harder for the opposing army to move her. Seriously.
** The game received criticism on its announcement, as people thought it was mocking the obese.
* Karnov's [[http://www.youtube.com/watch?v=aVxpFZurSCs balloooooooooon]] attack in ''VideoGame/FightersHistory''.
* The Hebby Repp, Sudo Neku, and Toximander dream eaters in ''VideoGame/KingdomHearts3D'' get a brief case of this whenever you feed them one of the various oversized portions of RareCandy. Evidently, their HyperactiveMetabolism doesn't kick in instantly like it does for the rest of the dream eaters.
* BigEater Li Xiangfei gained a huge balloon belly in [[http://www.youtube.com/watch?v=M4BEg4WjAGA her team's ending]] for ''VideoGame/TheKingOfFighters 2001''. Rather surprising since it was averted in the similar ending for ''The King of Fighters '99''. It seems the artist in charge for 2001, Nona (known for drawing {{Gonk}} versions of every character), has no problem subverting the BeautyIsNeverTarnished trope.
* Though it's hard to tell thanks to his anatomy (or lack thereof), ''Franchise/{{Kirby}}'' presents an especially absurd example. His size quite literally ''doubles'' when he inhales an enemy. (However, it swiftly returns to normal once he decides to swallow.)
** King Dedede is prone to this, too. When he swallows Kirby, his belly gets so big it forces his head all the way back until he spits him out. He also displays it if you let him beat you in Gourmet Race.
** All doubt is removed in the Wii installment, in which Kirby's belly wiggle is lovingly animated.
* ''TheLostVikings'' includes an air pump which balloonizes the three characters and make them float.
* In ''[[VideoGame/MarioAndLuigiBowsersInsideStory Mario & Luigi: Bowser's Inside Story]]'', one of the Mario brothers' attacks, Snack Basket, involves stuffing Luigi with treats until he balloons up, followed by Mario tossing him at the ground to create a shock wave like so.
** Also in ''Bowser's Inside Story'' is [[http://www.youtube.com/watch?v=43O59LqAhzM&feature=related this]] little plot point. Guess all those fat jokes turned true, Bowser.
** Come to think of it, the original game often did it with water or Chuckola Cola.
* In the ''VideoGame/MetalSlug'' game series, if you collect enough dropped food items, you transform into an obese version of yourself. This affects not only your movement, but also your attacks: They're all increased in size and power, and the homing missiles home in on enemies better. It also changes your standing melee attack into a fork stab and crouching melee attack into a belt whip.
** [[GratuitousEnglish "UH-OH, BIG!"]]
* The [[EverythingsBetterWithMonkeys Congalala]] in the ''VideoGame/MonsterHunter'' series uses this defensively, puffing out its stomach to deflect your attacks (Which may also trigger [[{{Fartillery}} a retaliatory fart]] if you keep hitting it there).
** The [[ThreateningShark Zaboazagiru]] uses this offensively, puffing out its belly if it manages to swallow you, afterwhich it'll start hitting it against the ground to cause damage to you and anyone else in the vicinity. Further, if you provoke it by breaking its ice armor, it'll temporarily inflate itself to point of looking more like a BlobMonster then a shark, switching to bouncing and rolling attacks instead of its usual biting and clawing as long as it remains in that state.
* In ''VideoGame/RaymanOrigins'' and ''VideoGame/RaymanLegends'', both the player characters and enemies swell up like balloons when they are hit enough times, and pop like such when they die.
* Hilde from ''ShadowHearts: From The New World'' has two forms. Curvy Hilde is the trope. Slim Hilde is the opposite. Oddly enough, she gains ''and'' loses weight via feeding (she drinks calories, not blood--some enemies have "negative" calories).
* This happens to Sims in ''TheSims 2'', in both directions: Immediately after getting up from a meal or getting off the treadmill, they may balloon to tubbyness or shrink to svelteness with a cheery sound effect. Contrast with ''The Sims 3'', where fat and muscle are tracked separately, and gained or lost at a gradual rate.
* In ''StreetFighter'', Dhalsim gets this just before [[BreathWeapon breathing fire]].
* In ''VideoGame/SuperMarioGalaxy2'', eating the blimp fruit causes Yoshi to swell up ''and float'' like a balloon.
** In ''VideoGame/NewSuperMarioBros'' U, there is a purple Baby Yoshi, whose ability is to swell up and float, similarly to Blimp Yoshi in ''Super Mario Galaxy 2''.
* ''VideoGame/SuperMarioWorld'' has the P-balloon, which enables Mario to swell up and float.
* Wario in the "Super Smash Brothers Brawl" [[http://www.youtube.com/watch?v=6WBFw-wLQr4 Trailer]]
** He also [[GassHole gains one]] over time during fights.
** In fact, this happened to Wario in [[VideoGame/WarioLand most games]] [[VideoGame/WarioWorld that feature him]]. For example, in ''Wario Land 3'', eating a single donut would cause him to balloon to sumo proportions, which would then be useful for crushing weight-related blocks.
** ''WarioWare DIY Showcase'' takes this UpToEleven, as one of the minigames has Wario's belly inflating to deflect rockets. Yes, you read that right.
* In ''SuperScribblenauts'', fattening foods will turn anyone who eats them ''instantly'' into "Fat", "Chubby", and "Obese" versions of themselves, which involves simply stretching the body portion of the sprite to be wider. Using a potion with one of those adjectives will achieve the same effect.
* During the Arizona chapter of the fourth ''VideoGame/TengaiMakyou'' game, a cinematic shows an obese cowboy sneaking into a woman's room and force-feeding her cookies that cause her to instantly fatten up. ItMakesSenseInContext (though not much, since the ''Tengai Makyou'' series is full of [[WidgetSeries very Japanese humor]]).
* This happened in ''UmJammerLammy'' after the title character gets free pizza after putting out a fire at a pizza shop. She gorges herself so much that she looks pregnant, but she just as quickly digests it.
* The Pakkun Lizards in the ''VideoGame/WorldOfMana'' games typically get a case of this if they succeed in catching someone with [[SwallowedWhole their signature move]], thanks to them being diminutive in size compared to their victims. It's a case of tactical suicide, as they can't move or fight back while in this state, leaving them at your mercy (Plus the devoured character only takes damage when spat out, if at all).
* ''Yume Penguin Monogatari'' ("Dream Penguin Story"), a Konami PlatformGame where you play a penguin trying to lose weight to impress his girlfriend. Falling in water will instantly make you as fat as you can get, and all the enemies throw food at you which will quickly fatten you up. One level is set in a giant cake. A [[DigitalPiracyIsEvil piracy check]], when failed, will cause you to instantly bulk up as soon as you're hit.
* In ''VideoGame/LegendofZelda: SpiritTracks'' you get the boss Fraaz, whose attack involves inflating himself with fire or icy air, and he shows off his ability within seconds of you meeting him for the first time.
* [[http://images1.wikia.nocookie.net/__cb20100514003413/megamitensei/images/0/02/Tzitzimitl.png Tzitzimitl]], from ''Franchise/ShinMegamiTensei'', or at least her appearance in ''Videogame/{{Persona 4}}'', has a subtle one of these. As her Compendium lore states, she's swollen-bellied because she eats ''stars''.
* Any time [[{{Franchise/Super Mario Bros}} Petey Piranha]] appears in a game where the player [[{{ElementalPowers}} uses]] [[{{WeaksauceWeakness}} water]] [[{{VideoGame/SuperPrincessPeach}} as a]] [[{{VideoGame/SuperMarioSunshine}} weapon]] you can guarantee you'll have to utilize his ballooniness against him to expose his [[{{AttackItsWeakPoint}} belly button]].
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