History Main / PowerDyesYourHair

*** ''Anime/WonderfulPrettyCure'': Komugi's brown hair turns pink with blonde highlights at the ends, Iroha's peach-orange hair turns bright blonde as Cure Friendy and Mayu's dark brown hair turns sea-blue as Cure Lillian.

** Pietro Maximoff makes a short cameo appearance in the mid-credits stinger to ''Film/CaptainAmericaTheWinterSoldier'' sporting dark brown hair and newly discovered speed abilities. By ''Film/AvengersAgeOfUltron'', he has a shock of grey hair to reflecting his increased control over his powers.

* ''Film/XMenTheLastStand'' has Jean Grey returning from the grave with much longer, much more vivid red hair as a sign of both her tremendously powerful abilities now unleashed, and the dominance of the Dark Phoenix.

* In ''WesternAnimation/TurningRed'', after Mei turns into a red panda for the first time, her hair turns ginger, as opposed to her old black hair. She hides the new hair in her hat the next day at school.

You've just got a power boost. The reasons may vary, whether it's from going into SuperMode, your SuperpoweredEvilSide deciding to wake up, you finally got your hands on that MacGuffin you've been after, you CameBackStrong whatever. The point is, you're now [[PersonOfMassDestruction capable of destroying the world three times over]], and you can feel it.

*** ''Anime/WonderfulPrettyCure'': Komugi's brown hair turns pink with blonde highlights at the ends and Iroha's peach-orange hair turns bright blonde as Cure Friendy.

*** ''Anime/WonderfulPrettyCure'': Iroha's peach-orange hair turns bright blonde as Cure Friendy.

* When Yuma merges with Astral in ''Anime/YuGiOhZEXAL'', his dark blue becomes blonde while retaining his pink hair in ZEXAL form. The former becomes [[spoiler: black with dark pink hair as Dark ZEXAL]], orange as ZEXAL II, and returned back to blonde as ZEXAL III.

* All protagonists from Studio Pierrot[[note]]with the exception of ''Anime/MagicalIdolPastelYumi'', who lacks OlderAlterEgo[[/note]] undergoes this:

* Yuu, the protagonist of ''Anime/CreamyMamiTheMagicAngel'', has blue hair in her normal form, and purple hair as her pop star alter ego, Creamy Mami.

* When Yuma merges with Astral in ''Anime/YuGiOhZEXAL'', his dark blue becomes blonde while retaining his pink hair in ZEXAL form. The former becomes [[spoiler: black as Dark ZEXAL]], orange as ZEXAL II, and returned back to blonde as ZEXAL III.

* When Yuma merges with Astral in ''Anime/YuGiOhZEXAL'', his dark blue becomes blonde while retaining his pink hair. The former becomes [[spoiler: black as Dark ZEXAL]], orange as ZEXAL II, and returned back to blonde as ZEXAL III.

* This happens to [[spoiler: Emrys]] in ''Fanfic/TheWizardInTheShadows''. It annoys him.

** Later played with, as Susan's hair turns [[JustForPun perm]]anently blue-black when she Awakens. Later it turns out that her hair was [[spoiler: ''literally'' colored with power, her long hair storing up power and returning to its original natural blonde as it releases the stored power when it's needed.]]

* In ''WebAnimation/SuperMarioBrosZ'', Franchise/{{Sonic}}'s entire body turns red after absorbing a [[Franchise/{{Mario}} fire flower]].

* VisualNovel/MagicalWarriorDiamondHeart: All the Crystal Warriors get this treatment when they turn into their magical forms. Downplayed with Sophia, Zacherie and Clover who follow the ''Anime/HeartcatchPrecure'' example above but played straight with the other Crystal Warriors; Valerie goes from red to bright pink, Amber goes from dark brown to blond, Alex goes from black to red and Liam goes from blond to bright green.

* On ''Series/BuffyTheVampireSlayer'', after [[spoiler:Tara dies and Willow absorbs the blackest magics right out of their tomes, her]] normally red hair changes to match, as do [[BlackEyesOfEvil her eyes]]. Conversely, when she [[spoiler:activates all the slayers]], her hair briefly goes white. Basically, she's ColorCodedForYourConvenience to indicate if she's casting good or evil magic.

* On ''Series/BuffyTheVampireSlayer'', after [[spoiler:Tara dies, Willow's]] normally red hair turns black, as do [[BlackEyesOfEvil her eyes]]. Conversely, when she [[spoiler:activates all the slayers]], her hair briefly goes white. Basically, she's ColorCodedForYourConvenience to indicate if she's casting good or evil magic.

* ''Literature/BofuriIDontWantToGetHurtSoIllMaxOutMyDefense'': Maple's black hair turns blonde when she transforms into an angel.

* ''VideoGame/TwistedWonderland'': [[spoiler:Silver's actual hair color is blond. Once he receives the blessing and protection of Lilia, his hair turns silver and stays that way since, hence his name.]]