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Anime & Manga
- Ira Gamagoori from Kill la Kill has only one size: Bigger than you. His size fluctuates so massively that a character can be as tall as his chest in one shot, then standing like a bug on his shoulder the next. His size and strength seem to fluctuate with how riled up he is at the given moment.
- Fairy Tail has Guild Master Makarov, who is one of the strongest characters in the series. Usually, though, he is a Miniature Senior Citizen.
- Panther Lily can temporarily shift back into the regular body he had back in Edolas for battles. In Earthland, he's just as small and cute as any other Exceed.
- Brandish μ of the Spriggan Twelve specializes in this magic. She's powerful enough to immediately raise or shrink an entire island in the blink of an eye.
- The three main characters in Ultimate Girls have the ability to grow to 100 feet tall.
- Kirara of InuYasha can alternate between her housecat-sized form and her battle-ready form, which is roughly the size of a horse.
- A power of the Guyver Gigantic, growing into the massive Gigantic Exceed. Useful when one of your enemies turns into a Kaiju. It's implied that not only does it increase the Guyver's physical size but also increases the power of the Giga-Smasher and the Gravity Orb. To the point where Sho considered using gravity orb to create a small black hole (an extremely difficult and almost uncontrollable feat when previously done by Guyot) to be the less destructive option than the Giga-Smasher Exceed!
- Mazinger Z: Several Mechanical Beasts had the ability to changing size. The first of them -Bicong O9- showed up as soon as episode 12.
- Employed by the Akimichi clan in Naruto as part of their clan jutsu, being able to increase the size of their whole body or just specific parts (usually their arms or chest). Choza is the first one to turn into a giant onscreen and has spent most of the ninja war fighting in this form, and Choji uses it a couple of times as well.
- Piccolo from Dragon Ball has this ability as an extension of his Rubber Man power, though he only used it once against Goku in the original DB, and then against Garlic Junior in Z filler. Lord Slug, being a recycled Great Devil King Piccolo with some Piccolo Jr. thrown in, grows gigantic at the climax of his movie (Piccolo, sadly, does not).
- Two filler characters have this ability in One Piece, both of them giants who ate the Mini Mini no Mi fruit, which gave them the ability to shrink at will. One, Blyue, only appeared in a game, while the other, Lily Enstomach, appeared in the Z's Ambition filler arc of the anime.
- In Magical Girl Lyrical Nanoha Vi Vid, Fabia Crozelg's bat devil has the ability to grow big enough to swallow multiple mages whole at the same time. Her trident devil can also grow as big as the bat devil.
Comics — Books
- Ant-Man and company (Black Goliath, Stature, Wasp, and Yellow Jacket) of The Avengers. Started out only being able to shrink. Later gained growth powers.
- The original Ant-Man, Hank Pym, invented Pym Particles which enable this exact power, and allow anyone who can get their hands on them to use it. Said particles were used, among other things, to create a super-villain prison where all the villains were 6 inches tall. Needless to say, there was a breakout.
- X-Men: This is a noticeable part of arch villain Apocalypse's shapeshifting powers, especially in the 90s animated series. Usually he'll just settle for towerering over his opponents, but on occassion he increases his size to such a degree that it becomes Attack of the 50-Foot Whatever.
- Short-lived Excalibur member Micromax.
- The Atom of the Justice League of America. Since the power comes from his belts, anyone who gets their hands on one can use it, much like the Pym Particles. As a consequence, there have been a few successors to the name, as well as an Evil Counterpart, Dwarfstar.
- DC's original shrinking guy, Doll Man, had the not-too-impressive ability to shrink to about six inches... though he retains his full-sized weight and mass, resulting in a measure of super strength. There's a modern Doll Man, as well, but he's permanently tiny.
- The Atom is an impressive version of this power set. Rather than gaining the ability to grow, he eventually gained the ability to shrink down to subatomic levels, opening up possibilities available to almost no one else. In addition, he can alter his molecular density, which enables him to glide on a low setting or have the equivalent strength of his regular size on a high one.
- Another member of the Atom legacy, Atom Smasher of the Justice Society of America, has the ability to grow. Unlike the Pym Particles, this is accomplished by his bones and muscles actually breaking and reforming as he enlarges. He also can't grow much larger than two or three times his original size.
- Colossal Boy and Shrinking Violet of the Legion of Super-Heroes. In the '90s version of the team, Colossal Boy died and Violet gained his growing powers, rechristening herself LeViathan. In the '00s version, Colossal Boy lives and Vi has been renamed Atom Girl.
- In the Threeboot ('00s) version, Colossal Boy prefers to be known as "Micro Lad", as his actual ability is to shrink to human size from his normal sixty-foot-tall size.
- Titan from Justice Machine.
- Elasti-Girl of the Doom Patrol.
- Among villains, one of the best known examples is Giganta from the DCU. However, she didn't develop this ability until she appeared in Super Friends, making the current version of her something of a Canon Immigrant.
- Alice from Alice's Adventures in Wonderland, in the League of Extraordinary Gentlemen, retains her size-changing powers from the infamous scene in the children's book.
- Micro-Might from PS238. Shrinking means her body increases in density, increasing her strength and durability. However, if she gets too dense, she's unable to move.
- In Wildguard, Jack Giant and Blaction Figure had growing and shrinking powers, respectively
- Mighty Man, from Amazing Man Comics, has the ability to change his size.
- Miss America, who was originally created for Military Comics but later became part of The DCU, has the power to shrink.
- Mr. Mystic, from The Spirit Section, has the ability to change size.
- Little Cheese, from the Animal Superhero team Captain Carrot and His Amazing Zoo Crew!, is anthro mouse who can shrink himself to the size of a real mouse.
- Golden Age supervillain the Claw could shift between a six-foot tall man and large enough to dwarf New York City.
- Tara and Garganta from Femforce both have the ability to grow to giant size.
- Maul from WildC.A.T.s.
- Tinkabelinos, rebel faerie princess in Wisdom, can shift from a tiny fairy to a normal-sized woman with a big gun.
- In Astro City, Natalie Furst of the First Family and Max O'Millions of Honor Guard can make themselves grow to enormous size.
Films — Animated
- Sinbad: Legend of the Seven Seas has Eris, Goddess of Chaos, able to shift between normal and absolutely massive with no problem. It seems to mostly be for the sake of intimidation and just because she can, as she favors manipulating people based on their flaws and sending the occasional minion over stomping on random things herself.
Films — Live-Action
- Ant-Man has two iterations of the titular character (Hank Pym and Scott Lang), The Wasp (Janet Van Dyne), Yellowjacket (Darren Cross), and potentially the second Wasp (Hope Van Dyne), who all wear special suits which utilize Pym Particles, allowing their wearers to shrink and grow at will. The film also presents a clear danger to the ability: shrink too far, and you may never return.
- Most heroes of the Ultra Series (as well as many of the non-Ultra aliens). As well as the Godzilla franchise's Captain Ersatz of Ultraman, Jet Jaguar.
- Justin Stewart of Power Rangers Turbo, a ten-year-old Child Prodigy who was the blue ranger, shifted to adult size when he morphed for some reason. He shifted back whenever he removed his helmet, oddly enough. It was almost like he could only maintain his shifted size in situations where he'd be played by a stunt double.
- The Misfits of Science had Dr. Elvin "El" Lincoln a really tall guy who could shrink.
- Crash Mc Larson on The Aquabats! Super Show! can grow to an enormous size, but it's controlled by his emotions, which he's not very good at controlling, which makes them rather unreliable.
- The overwhelming majority of Kaiju Big Battel's roster have size shifting powers. Those that don't are either permanently giant or have some other way of counteracting the giant sized monsters.
- Perhaps needless to say, tabletop RPGs created to handle playing in the superhero genre usually include both powers. Fights between characters of massively disparate sizes can also seriously challenge a game's usual combat rules, which usually assume roughly human-sized opponents facing each other as the unspoken default and whose designers may not have stopped to consider how to address questions such as "can I climb/fly into my giant-sized opponent's ear and knock him out from there?"
- Dungeons & Dragons
- The wizard spells Enlarge Person and Reduce Person, which do exactly what it says on the tin. Also Righteous Might for clerics.
- Originally introduced in the 1st Edition Oriental Adventures sourcebook (and then seen again in Complete Arcane) are the Giant Size and Minute Form spells. Even a Squishy Wizard is going to hurt when she's hitting you with a tree.
- Psionic characters have the Expansion power, which achieves the same effect. It has the added bonus of working on non-humanoids just as effectively as humanoids and even allowing the target to grow even more. There is, of course, an opposite that causes the target to reduce in size.
- The race of spriggans from early editions of the game were gnome-sized normally, but could grow to the size of ogres as a racial ability.
- In Changeling: The Lost, there exists a Kith (sub-type) of the Ogres known as Gargantuans; their particular gift as Changelings is called Spurious Stature, which enables them to grow to enormous size for a brief time. Given the somewhat more subdued nature of the New World of Darkness, this is less extreme than most examples of this type, though a newly escaped Gargantuan can grow to the size of a gorilla or grizzly bear depending on their power. Supplementary material implies that their size-changing power is a consequence of their reduced power on Earth; supposedly, some Gargantuans remember being of perpetual giant-size in the domain of the Fae.
- The multi-kith rules also make it possible for other sorts of Ogres to do this as well, or any possible Changeling, depending on what's house-ruled in.
- Clarence Willard of Ripley's Believe It or Not stage show could somehow shift his body so that he appeared to grow several inches.
- Super Mario Bros.
- The main gameplay mechanic of the series, the platformers in particular (with some exceptions). Playable characters don't have a life meter, instead health is determined by their size. If they're normal-sized (Super Form) and take damage, they shrink down into a "small" form, where another hit kills them and they need a Power-Up to return to normal size. Later games have actually played around with this, the many examples below:
- Mario, of course. Firstly he had the Super Mushrooms that made him grow. Then in New Super Mario Bros. a Mini Mushroom was introduced which shrunk him to fit into tiny spaces and Walk on Water, as well as a Mega Mushroom which made him even bigger than with the Super Mushroom.
- Although New Super Mario Bros. series seems to continue the adjustment first seen in Super Mario Bros. 2, that the "big" size is actually their normal size; Mario and friends shrink when they get hit and then need to use a Super Mushroom to return to normal.
- Bowser had occasionally became a giant in some games, and Rosalina actually has the ability to grow to the size of a planet!
- Wario Land's Wario, in symmetry with his redder counterpart — but he also loses most of his hair when he shrinks.
- King Boo, as of Luigi's Mansion: Dark Moon, gained this ability. Unlike most others in the series, it seems he can use it at will.
- In the Paper Mario games — well, the first two — both Mario and enemies can grow, increasing their Attack. Some enemies have attacks that shrink Mario and/or his partner, reducing their Attack.
- In Super Paper Mario, the Starman makes the character who touches it change to his/her 8-bit version and grow to almost the height of the screen, temporarily allowing you to plow through enemies and breakable blocks.
- A few of the spin-off games actually give Mario the ability to grow in size at will - Though he can't stay his new size for more than a couple of seconds with this method.
- Mario & Luigi: Superstar Saga has an interesting play on this trope: Luigi can make Mario shrink down to fit into small passages by hitting him on the head with his hammer.
- Touhou: Suika Ibuki's most famous use of her density manipulation comes in the form of her 'Missing Purple Power' spellcard, which causes her to roughly triple her size. Fanon depictions sometimes show her becoming a literal 50-foot oni and beyond. What makes this even more noticeable is the fact that Suika is one of the shortest characters in the series at normal size. She also has the shrinking variation: She can generate mini-Suikas which are roughly 3 inches tall.
- Also from Touhou, Shinmyoumaru is an exclusive example of this. However, she doesn't just make herself bigger. She makes her bullets AND THE PLAYER bigger, too. Very bad in a game in which you have to dodge bullets.
- In Super Pac-Man, Pac-Man could eat a Super dot and temporarily become enormous. The super-sized Pac-Man was much faster and could pass through locked doors and ghosts without a problem.
- In The Legend of Zelda: The Minish Cap, Ezlo's magic enables Link to shrink down to mouse-size.
- Asura's Wrath has Asura's Master, Augus, who has a blade that has this power.
- Wyzen is this as well.
- Star Gladiator's Gore Gajah and Luca are able to either grow or shrink through the use of Plasma Magic.
- In Alice in Wonderland for the Commodore 64, Alice can shrink and grow using consumable mushrooms that respawn every once in a while.
- By contrast, in Alice: Madness Returns, once Alice finds a pool of liquid, she can change to a smaller size as long as you hold LB. This has several benefits: The ability to get through keyholes, the ability to see clues left by the Insane Children, the ability to (better) see (nearly) invisible platforms and Snouts, the ability to escape certain attacks, and the ability to heal in Shrinking Violets (or, in a New Game+, heal even without them as long as you're wearing the Classic costume). In Queensland, she eats some cake in order to grow, after which she's able to crush the Executioner, then go on through a sequence involving the ripping of tentacles, the squashing of hearts, and the elimination of hundreds of now-relatively-tiny Card Guards. After squashing the last heart, she drinks from what is essentially a bowl to her, then shrinks, stepping over the wall as she does.
- Durkon from The Order of the Stick occasionally transforms into a fifteen-foot-tall dwarf when in dire straits. (Based on D&D spell Righteous Might, see above.)
- Vittoria of SERGOM can do this.
- Boltrin of Dragon Mail can grow once per day.
- Saurus from Zodiac has this ability.
- Heroes Unite/Heroes Alliance: The Flea has this ability.
- The aptly named Giant Girl from Giant Girl Adventures.
- In the Whateley Universe, not only are there many people who can do this, but there is more than one superpower that will let you do it. Some Warpers can shrink or grow by using a warp displacement field about themselves so that they don't change but their relationship to the outside world is altered. Some Shapeshifters can shrink or grow also, and they have the Magic Pants problem.
- In Worm, identical twins Menja and Fenja have this ability.
- Apache Chief from Superfriends. Considering he's wearing a loincloth, we hope he's wearing some undies.
- Ben 10
- In Ben 10, Ben does this whenever he turns into Grey Matter or Way Big given their size. They don't have sizeshifting powers though.
- In Ben 10: Alien Force, there are Humungousaur, who can grow to the size of a small building, and Nanomech (Unlocked in Ben 10: Alien Swarm), who can shrink down to microscopic level.
- Big purple Mego of Kim Possible — "He's a shrinker."
- Bumblebee's animated version on Teen Titans.
- Xiaolin Showdown
- The Changing Chopsticks shrink any user to the size of a rice. And if used with the Reversing Mirror they actually make the user grow.
- Not to mention Dojo has this power all the time.
- Dexter's Laboratory
- Capital G of the Justice Friends could use this power. Only seen twice, neither time helpful.
- One episode involved Dexter having to watch over his sister's imaginary friend, a jolly dragonish creature named Koosalagoopagoop (or Koosy for short) who can change size at will.
- Ickis of Aaahh!!! Real Monsters is normally a little Ugly Cute bunny-like monster, but can balloon up to an impressive height when scaring humans.
- Jake from Adventure Time can grow more than ten times his size, as well as shrink down to pocket size. It helps that he's also a Rubber Man.
- Meteor Man from The Galaxy Trio.
- A number of Transformers from Transformers Generation One change size when they transform, most famously Megatron (Walther P-38) and Soundwave (tape player).
- This has carried on to other Transformers series, the most notable between Transformers Animated and Transformers Prime with characters like Prowl, Bulkhead, and Arcee.
- Also in Animated, Shockwave can change size even while in the same form. This is part of disguise as an Autobot, because Autobots are on average much smaller than Decepticons in Animated.
- From The Super 6 comes Elevator Man, who can grow or shrink when he presses a button on his belt.
- Rubilax from Wakfu is tiny in his default (true) form, but the more he is hit the bigger he gets. In season 2 Anathar copies this power.
- Cassie from Dragon Tales had a tendency to shrink to about a foot tall when upset.
- In Barbie and the Secret Door, the more magic Malucia's wand drains, the larger its headpiece becomes.
- Mogo, a one-episode antagonist from Generator Rex, is a mongoose that can grow or shrink down thanks to being an E.V.O.