History OneWingedAngel / VideoGames

** Subverted in ''[[VideoGame/TheLegendOfZeldaOracleGames Oracle Of Ages]]'' by the game's BigBad Veran: Her true form is human, but she immediately transforms into something that looks like a "mutant fairy", and her final "combat form" (which were actually three in one) is so ridiculous that she feels humiliated by having to resort to it.
** General Onox of ''Oracle Of Seasons'' plays it straight by revealing his true form to be a giant skeletal dragon.

** The FinalBoss of ''VideoGame/MarioAndLuigiDreamTeam'' is [[spoiler:a larger, rainbow-colored Bowser called "Dreamy Bowser"]], powered up as a result of [[spoiler:swallowing the fragments of the shattered Dream Stone]].

** [[MonsterClown Owald]] gains a new outfit, sporting a more jester-like hat and a long cape, as well as four additional arms.

** [[VampiricDraining Elena]] transforms into a vampiric monster made of blood, alongside glowing red eyes.

*** Godfrey, while not transforming physically, proceeds to [[OffWithHisHead graphically tear off the head]] of the Beast Regent Serosh (that essentially acts as a PowerLimiter) from his body, as well as get rid of his armor. The resulting shirtless, brutish and [[{{Narm}} slightly cheesy]] barbarian Hoarah Loux who, covered in blood, screams in rage before aggressively and relentlessly pursuing you all around the arena, seeking to pummel you into a pulp with his bare hands, contrasts heavily with the much more dignified Godfrey. He also marks a sudden and intense shift in the rhythm of the fight, but also in how intimidating he is.

** The final boss of ''VideoGame/AdventureIsland II'' is a larva that forms into a giant fly once destroyed. [[GiantSpaceFleaFromNowhere Yes.]]

* In ''VideoGame/{{Albion}}'', the Cuain, leader of the Kenget Kamulos, [[AuthorityEqualsAsskicking gets this as a perk with the job]]. He can turn into the avatar of Kamulos, the god of war. You fight the current Cuain and it's one of the very few real boss fights in the game.

** ''VideoGame/Kirby64TheCrystalShards'':
*** Mini-bosses Waddle Doo and Possessed King Dedede kind of count; they're more intimidating than their base forms, but they're nothing special.
*** Scarfy turns into a terrifying one-eyed kamikaze monster whenever you try sucking it up or turning your back on it.
*** Wispy Woods starts off normal. When you kill the three Wispy Woods Jr. around it, it turns red with rage for the second half of the fight.
*** HR-H starts the fight as a humanoid robot that attacks Kirby from a distance with lasers, long arms, and missiles. After Kirby defeats it, it turns into HR-E, a more feral robot that chases after Kirby with large scissor arms and missiles.

** The final boss of ''VideoGame/KirbysReturnToDreamLand'' also pulls this twice, with [[spoiler:Magolor]] switching into a much more grotesque form after the first form is beaten.
** The final boss of ''VideoGame/KirbyTripleDeluxe'' does this, as well, having [[spoiler:Queen Sectonia]] merge with the Dreamstalk to become a gigantic insect/flower hybrid.

** Ghoulfather from ''VideoGame/YokaiWatch3'' also fights with a second form that drastically changes his appearance, using the power of the UFO Stone to become Don Spiracy. In the post-game, he pulls if off again when it's revealed he survived, transforming into Goldfather with the power Pyramid of Clu's gold.

*** [[BonusBoss Kangaxx the demilich]] starts out as a moderately tough spellcaster, then transforms into a levitating skull that is immune to magic, immune to weapons of less than + 4 enchantment, regenerates, has an [=AoE=] instant death attack, and casts some of the most powerful spells in the game, including 'Imprisonment', which not only causes instant almost irrecoverable death for the duration of the fight, but can also [[GameBreakingBug break the plot]].

*** Finally, from the DLC case, there's [[spoiler:Marlon Rimes]], who, upon being accused, drinks a few gallons of water from [[spoiler:his barrel]], and throws it aside. [[GrowingMusclesSequence Cue instant bulk-up]], a large fish to carry out of nowhere, a massive gold chain bearing his name, and pirate hat to top it all off, along with a much more tough and boisterous personality. And ''there'' is where you begin to understand how he got his [[spoiler:rapping career]].

* In ''VideoGame/ArNosurgeOdeToAnUnbornStar'', [[spoiler: Zill starts an AssimilationPlot that transforms her into an extradimensional being called the Maternal Overseer]].

* ''VideoGame/ARKSurvivalEvolved'' has a storyline detailing the history of the arks through notes left by past survivors. One of these survivors is Edmund Rockwell, who progressively gets more and more obsessed with a miraculous "element" found on the ark before injecting himself with it and mutating into a grotesque Godzilla-sized tentacled monster. He serves as the final boss of the Aberration DLC.

* ''VideoGame/TheAngryVideoGameNerdIIAssimilation'' parodies this trope with Sir Werepire, who transforms from a vampire to a wolf, to a [[NinjaPirateZombieRobot Vampire Werewolf Knight]], to a [[OverlyLongGag Vampire Werewolf Knight GHOST]].
** When his corpse rises up as a zombie, the Nerd gets fed up with the fight, ends it, and tells him to fuck off.

** The final boss of ''VideoGame/KirbyAndTheForgottenLand'' has [[spoiler:Fecto Forgo combine itself with Elfilin (its other half)]] to become its original complete form, [[spoiler:Fecto Elfilis]], a slender flying creature with gigantic ears and a spear as a weapon.
*** The TrueFinalBoss also counts: as the figurine says, "A unique convergence of elements, from native-beast souls to ethereal [[spoiler:butterfly]], gave a stubborn soul one last chance at revenge." It's the last opponent of the game's hardest BossRush, and it has everything that made the original fight difficult cranked up to maximum difficulty.

** ''VideoGame/Kirby64TheCrystalShards'' has both Possessed King Dedede and the final form of Dark Matter, sorta. And there's even a regular enemy, Scarfy, that pulls this rather terrifyingly.

** The final boss of ''VideoGame/KirbyAndTheForgottenLand'' has [[spoiler:Fecto Forgo combine itself with Elfilin (its other half)]] to become its original complete form, a slender creature with gigantic ears and a spear as a weapon.

** The final boss of ''VideoGame/KirbyCanvasCurse'' has [[spoiler:Drawcia]] transforming into her true form, a giant blob of paint, dubbed "[[spoiler:Drawcia Soul]]".

* All of the characters in the ''VideoGame/BloodyRoar'' series are capable of switching between normal human form and superpowered creature forms AND a glowing 'hyper' version of the beast form, but in "Bloody Roar: Primal Fury", the hyper-beast form of the true final boss, Uranus, is identical to her human form. Her beast form is a chimera, which is interpreted as blue and scaly with red lines, covered in spikes, and kind of bull-like, so yeah, it's a monster.

*** In the DLC route [[spoiler:Aelfric]] transforms in the final chapter [[spoiler:using the Chalice of Beginnings to merge with the corpse of his beloved, who is also the protagonist's mother,]] turning into the grotesque [[EldritchAbomination Umbral Beast]] as the FinalBoss of the DLC.

** In ''VideoGame/KirbySuperStar'', there's [[spoiler:Marx]]. ''[[VideoGameRemake Kirby Super Star Ultra]]'' manages to one-up on [[spoiler:Marx in [[NintendoHard "The TRUE Arena"]] -- if you get to the final battle, you will see a movie where Marx brings back his soul by absorbing Nova's power]]. [[spoiler:You will then fight Marx Soul, which is a more powerful and freakier incarnation of Marx that has an ''absolutely terrifying'' death scream.]]

** ''VideoGame/SuperSmashBrosUltimate'' introduces as DLC the TropeNamer himself, [[VideoGame/FinalFantasyVII Sephiroth]]. Not only can he sprout his eponymous one wing from ''Advent Children'', but he also turns into Safer Sephiroth as part of his Final Smash.

* ''VideoGame/SweetHome'': Lady Mamiya turns from a regular-looking ghost of an old woman to a horrific blue-skinned monster with the right side of her face burnt, spindly arms, and lots of tumor-like bumps (which are actually faces of children who she burned alive) covering her and forming a massive hunchback in the final battle.

** On the Genocide Route, [[spoiler:Undyne, after being seemingly struck down by the player, gets back up in a flash of light as Undyne the Undying, her one-winged form. In addition to being referred to in the start of her fight as "the heroine" and gaining new, spike-clad armor, her new forms' arrow attacks become much faster and deadlier than her usual set prevalent in the other routes, and she gains more spear-based attack patterns. Her new speed, patterns and attacks, as well as the circumstance of [[DifficultySpike being the first actual boss battle of the Genocide route]], make her harder to fight than Photoshop Flowey.]]

[[quoteright:312:[[VideoGame/SweetHome https://static.tvtropes.org/pmwiki/pub/images/owamamiyadx.png]]]]

** In ''[[VideoGame/TombRaiderAngelOfDarkness Angel Of Darkness]]'', Boaz is shoved into a pod of some sort and mutated into a giant [[ThatOneBoss slime-spitting cockroach-like creature]] (then turns into a skeletal ClippedWingAngel).
** Honourary mention goes to Natla from the [[VideoGame/TombRaider original game]], who fixes herself up as a two-winged version for the final showdown.

** Nova from ''VideoGame/AzureStrikerGunvolt'', after being defeated by Gunvolt, he proceeds to [[spoiler:absorb three Glaives and Joule and then]] become a towering, multi-armed black/white robotic monstosity that's aided by two other robots.
** The Mysterious Girl from ''VideoGame/AzureStrikerGunvolt2'', after being confronted by Gunvolt/Copen, she [[spoiler:steal their Mirrors Shards and absorbs the power of the Muse from Mytyl]] and transform into a fairy-like form [[spoiler:resembling a dark version of Joule/Lola]].
** At the climax of ''VideoGame/LuminousAvengerIx'', Copen reaches the heart of the Sumeragi's secret bunker, he is confronted by Sumeragi's AI, [[spoiler:Demerzel]], who assumes the form of [[spoiler:Asimov]]. After Copen defeats [[spoiler:Asimov, Demerzel reveals his true form, as a being of pure electricity who ascended from his powers as an Azure Striker]].