History Main / PowerDyesYourHair

** Negi Springfield has his hair turn white during his [[{{Supermode}} Magia Erebea]].
** [[spoiler:Mana Tatsumiya]] has her hair turn white when releasing her full power.

* All MagicalGirl 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.
** Persia from ''Anime/PersiaTheMagicFairy'' normally has light blue hair that turns dark pink in her adult form.
** ''Anime/MagicalEmiTheMagicStar'' has Mai having a brown hair as civilian and teal hair as Magical Emi.
** Miho's brown hair turns blue when assuming ''Anime/FancyLala'' alter ego.

** In the 2002 anime, Ichigo's TransformationSequence, in addition to turning her into a CatGirl and giving her nice MagicalGirl clothes, changes her hair from dark red to pink, and the rest of the girls also have their hair colors changed to brighter shades.

* Many Marvel mutants, upon getting their powers at puberty, also get weird-colored hair. (Or, as in Professor X's case, they lose it entirely.)

* ''Film/XMenTheLastStand'' has Jean Grey returning from the grave with much longer and more vivid red hair as a sign of both her tremendously powerful abilities now unleashed, and the dominance of the Dark Phoenix.
* ''Film/XMenApocalypse'' shows Storm only gaining her signature white hair when [[spoiler: Apocalypse gives her a power upgrade.]]

* ''Literature/TheCombatBakerAndAutomatonWaitress'' has a {{Justified}} example in book 2 - [[RobotGirl Sven]]'s hair was designed as a radiator to vent excess heat, so releasing her PowerLimiters burns away the black hair dye she'd been using as a disguise, reverting it to its natural silver colour.

* [[ShrinkingViolet Akane]] in ''Literature/{{Kampfer}}'' turns into a FieryRedhead in her Kämpfer form, Shizuku's normally black hair turns white on the underside and Mikoto's hair turns white.

* ''Literature/ReignOfTheSevenSpellblades'': {{Justified}}. Nanao has a trait called "innocent color" which causes her normally black hair to turn white when she draws magical power. Oliver's narration explains that it only happens in mages with exceptional magical circulation and a crystalline hair structure that allows uninterrupted flow of magical particles.

* Sort of applies in ''Literature/{{Warbreaker}};'' royals of the tiny mountain kingdom have what is called "The Royal Locks," hair that changes color at will. (They can also grow it at will.) This power has more applications than you'd think, in a world whose magical system mostly revolves around color.
** It also changes involuntarily in response to their emotions. When Siri is traveling to the city to marry the God-King, she's so terrified [[LockedIntoStrangeness that her hair stays white the entire way.]]
** When Vivenna is living on the street, her hair stays [[DiseaseBleach white the entire time]] as she's starving and can't spare the energy to make it any other color.

** Zidane, though, doesn't turn silver. He goes blonde to [[RealMenWearPink pink!]]
* ''VideoGame/FireEmblemThreeHouses'': When [[spoiler:Sothis]] bequeaths her power to [[spoiler:[[PlayerCharacter Byleth]]]] the latter's hair (and eyes) change color from their natural teal to a bright green, [[spoiler:much like the other Children of the Goddess]]. Additionally those [[spoiler:artificially implanted with a second Crest]], like [[spoiler:Edelgard and Lysithea]], have their hair bleached stark white, along with other, [[YourDaysAreNumbered less benign]] side effects.
* ''VideoGame/FireEmblemEngage'': This is what happens when someone [[FusionDance merges]] with an [[FightingSpirit Emblem]]. Their clothes change and their hair turns into a different color depending on the Emblem. For example, merging with [[VideoGame/FireEmblemShadowDragonAndTheBladeOfLight Marth]] or [[VideoGame/FireEmblemAwakening Lucina]] turns the unit's hair light blue, merging with [[VideoGame/FireEmblemGaiden Celica]] turns their hair red, merging with [[VideoGame/FireEmblemFates Corrin]] turns their hair white, merging with [[VideoGame/FireEmblemThreeHouses Byleth]] turns their hair a light purple, etc.

* ''WesternAnimation/AmethystPrincessOfGemworld'': Amy's hair changes color from regular blonde to strawberry blonde. When she taps into her full power, her hair gets even longer and turns purple.

* ''WesternAnimation/TheDragonPrince'': Dark magic, especially necromancy, seems to bleach your hair. A strand of Claudia's hair turns white after healing Soren's paralysis, and half of her head turns white after she [[spoiler: resurrects Viren.]]

*** ''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.]]