* ''Webcomic/ElGoonishShive'' has a handful of them:
** Guineas plays it normal, able to turn from a normal guy into a beastly guinea pig-man form, though he prefers to stay a guinea pig being most of the time and it counts as a {{Reveal}} when his human form turns out to be [[http://www.egscomics.com/index.php?id=557 handsome]].
** Due to the incident that produced Ellen (long story), Elliot wound up permanently able to change into the cat-man form he'd asked Tedd to zap him into afterwards in order to chase her down. Unlike most examples, though, he didn't ''know'' he could do it until he involuntarily did it again to fight Hedge. Which knocked him out.
** Grace has a metric buttload of OneWingedAngel forms, most also of the CuteMonsterGirl variety. Except for her Omega form, which turns her into a feral squirrel with horns and razor claws. And she's ferocious, [[BewareTheNiceOnes as opposed to her normal bubbly self]].
** Vlad does this in reverse. Ellen zaps him with a GenderBender ray, turning Vlad the part bat, part bird, part terrifying monster-man into Vladia, the relatively normal girl, the only change Vlad's likely to undergo due to a PainfulTransformation problem that nearly killed him the last time he tried to be human: she's not sure she'll survive a gender shift, and doesn't want to risk it now that she's finally human.
* ''Webcomic/{{Freefall}}'' has Sam Starfall, who is drawn as a rather cartoonish mechanical alien, but that's just a disguise for him to "''[[LoveableRogue safely]]''" interact with other beings. His species' true form is an [[EldritchAbomination extremely disgusting squid-like creature]], the mere sight of which triggers what he assumes is a [[StressVomit regurgitation reflex]] in humans.
* It wouldn't be a proper RPG-spoofing webcomic if ''Webcomic/{{Adventurers}}'' didn't have [[http://www.adventurers-comic.com/d/20040817.html an instance of this.]] (Also pictured in title)
** Parodied much earlier in same with [[http://www.adventurers-comic.com/d/0035.html "Wing-B-Gone!"]] Which brings up a good point: wouldn't this be ''really inconvenient''?
* [[LampshadeHanging Lampshaded]] in ''[[http://home.comcast.net/~ron_purcell/golden.html Golden]]'', when the villain sorcerer decides it is times to turn into his combat form to end the protagonists, and promptly turns into... [[http://home.comcast.net/~ron_purcell/golden34.html a binturong with white spots.]] (And not a badger at all, whatever anyone is saying, no Sir.). The protagonists even comment on this:
---> Sorcerer: "Enough games! With all the powers of HELL at my command, I now take the form of the Ultimate Destroyer, a [...] fiend so diabolical, so terrible, that all who lay eyes upon his visage fall into..." (his bad guy monologue drones on the background)
---> "...yeah, he's going to turn into a dragon, isn't he?"
---> "Seems rather cliché. Perhaps a giant octopus with multifarious appendages?"
---> "No. Giant snake for sure."
* Wyler, a rich, weak mastermind from ''VideoGame/ArtOfFighting 3'', became one after drinking an elixir that more or less turned him into TheIncredibleHulk.
* One of Prof. Broadshoulders' (from ZebraGirl) defining characteristics is a "Mr. Yuk" face branded onto his forehead. Turns out [[spoiler:it was actually a demonic third eye, and by opening it he turned himself into a demon.]]
* Inverted in archcriminal Fructose Riboflavin's first appearence in ''TheInexplicableAdventuresOfBob.'' He first appears disguised as a handsome, muscular human, and does all his ranty monologuing in that form. It's only ''after'' his scheme has failed that he drops the disguise as pointless, revealing his mildly creepy but not very frightening wizened old alien form.
* [[http://www.sundayat10.com/?num=527 Parodied in this]] ''Sunday At Ten'' strip.
* In ''Acorn Grove'', you only get a hint of the devil's true form in silhouette. Can't really make out anything other than lots of tentacles.
* In ''TheNonAdventuresOfWonderella'', '''[[http://nonadventures.com/2009/07/04/stuck-in-the-middle-with-eulogy/ Nixon]]''' supposedly does this.
* ''[[Webcomic/EightBitTheater 8-bit Theater]]''"
** [[spoiler:[[SuperpoweredEvilSide Super Double Evil]] [[PhysicalGod Sarda]], created from absorbing the power of the [[ElementalPowers elemental]] [[PlotCoupon orbs]] and [[NiceJobBreakingItHero Black Mage's super evil]]. [[ClippedWingAngel However]], [[PhlebotinumOverload this also turns out]] [[AntiClimaxBoss to be his undoing]]]].
** Chaos also has a massive, [[ArtShift 3D]] form. [[AntiClimax This being 8-Bit Theatre]], he reverts without a fight.
-->'''Black Mage:''' How'd you get Chaos back to his not a giant bastard size?
-->'''White Mage:''' ''(in flashback)'' Chaos! You're too tall!
-->'''Black Mage:''' Oh, that ''so'' did not work.
-->'''White Mage:''' So did.
** Black Mage's super-evil form probably counts as well, as he gains [[CombatTentacles Combat Tentacles]] of shadow.
* In ''ProblemSleuth,'' Mobster Kingpin's imaginary self becomes [[http://www.mspaintadventures.com/?s=4&p=001069 Demonhead Mobster Kingpin]] for the final battle, [[MarathonBoss which takes up nearly half the story]].
* ''Webcomic/SluggyFreelance'' features a random {{mook}} getting infected with a "Cheesy Bossmonster Virus", which is this trope in a tube. [[http://www.sluggy.com/comics/archives/daily/091116]]
** In the "Holidays Wars" story, there's one on both sides: Bun-bun becoming [[spoiler:a quasi-god of various holidays, complete with a different colour scheme, an occasionally visible aura of power, and an updated switchblade design]] and fighting Santa Claus who had [[spoiler:become an alien monster some time ago and for this fight grown even bigger.]] (It doesn't really [[ItMakesSenseInContext make sense in context]], it's just CrazyAwesome.)
* ''Webcomic/{{Homestuck}}'' has [[http://www.mspaintadventures.com/?s=6&p=003568 this sequence]], in which TheStarscream uses a GameBreaker weapon to [[spoiler:dering and dethrone]] and then kill [[spoiler:his queen]], then proceeds to take the RingOfPower. Which turns him into an evil, [[NinjaPirateZombieRobot two-winged two-tentacled one-armed cat-faced sword-impaled harlequin-garbed]] EldritchAbomination.
** [[FromBadToWorse It gets worse]] [[spoiler:when Becquerel gets prototyped]], though his appearance gets less ridiculous as the last prototyping's power overrides some of the previous elements. He has been shown to be able to return/retract them (at least the tentacles) [[spoiler:with his newfound RealityWarper powers]].
** Lord English is essentially this to [[spoiler:Doc Scratch]], although it's not so much [[spoiler:Scratch]] transforming as it is [[spoiler:Lord English emerging from his dead body.]]
*** Possibly a straighter example with [[spoiler:Caliborn (assuming he really is English's younger self), although English is basically a much taller and more muscular version of Caliborn, but ''[[RealityWarper much]]'' [[PhysicalGod more]] [[MultiversalConqueror powerful]]]].
** Hell, the Cherubs do this as a mating action: they transform into snake-like creatures a cosmic measurement long and do battle, with the loser laying the eggs.
* Oosterhuis/[[spoiler:Ari]] from ''{{Panthera}}'' plays this transformation [[http://www.pantheracomic.com/?p=1280 near perfectly]]. He even seems to win the first encounter, too.
* Referenced by name in [[http://www.vgcats.com/comics/?strip_id=199 this]] VGCats.
* The end boss of AdventureDennis.
* Webcomic/GunnerkriggCourt has General Ysengrin, a wolf in what is basically wooden power-armour. Normally he uses this to maintain a humanoid appearance, but when he loses his cool, the living wood turns him into something that would give Creator/HayaoMiyazaki nightmares!
* In ''DragonMango'', [[http://dragon-mango.com/comic/chapter02/dm02-57.htm the count does this when the knights and Flan have defeated him.]]
* In "WebComic/AxeCop Gets Married", the final boss is the alien king Cauber Helen, who's a shapeshifter and just becomes even bigger and uglier to fight. To match him, Axe Cop and his allies, some of whom were already a bit NinjaPirateZombieRobot, use his sons' Ultro Power to combine into what the artist (not writer) tentatively describes as "Super Hypno Double-Monkey Batman Axe Cop Familsauras Rex Wrinkles". Cauber then starts transforming into different forms, culminating in a giant sea serpent of planetary size when his opponents send another giant sea serpent against him.
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