[[quoteright:329:[[Manga/MermaidMelodyPichiPichiPitch http://static.tvtropes.org/pmwiki/pub/images/tvt_curtainsmatchthewindow.jpg]]]]
[[caption-width-right:329:Blue, purple, green, no hair dye required.]]

->''"And for some reason, I got blue hair. [[TropeNamers You gotta have blue hair]]."''
-->-- '''Strong Bad''' (describing his {{anime}} counterpart Stinkoman), ''WebAnimation/HomestarRunner'', [[http://www.homestarrunner.com/sbemail57.html "Japanese cartoon"]]

There are plenty of ways to differentiate characters from each other, but one of normally limited utility is hair color. Human hair has a limited amount of variation, after all, not enough to make everyone on a half hour show once a week [[ColourCodedForYourConvenience easily distinguished]]. Thus, this {{trope}} was born, so that artists could use the full spectrum of color. It's so common that it's mostly considered an AcceptableBreakFromReality now.

This is especially common in {{anime}}, where characters often have impossible hair colors. This started with {{manga}} series that used distinctive colors on the covers to make characters stand out, even though they all had either dark or light hair in the actual black-and-white pictures; {{anime}} brought it to the screen and made it a standard part of character designs.

There are several reasons why artists do this. The first, noted above, is to help distinguish characters from each other, as with AnimeHair. It may be done to indicate character personality, such as an EmotionlessGirl [[ReiAyanamiExpy with blue or white hair]]. It may indicate that a character is unique, if they are the only one in the cast with their hair color. Or it may be done just to suit the artist's taste for variety.

Some specific colors have {{subtrope}}s which ascribe certain character traits to them: [[ShyBlueHairedGirl a blue-haired girl may be shy]]; a [[RoseHairedSweetie pink-haired girl may be cheerful or passionate or sweet]][[note]]any of the three; it's ambiguous[[/note]]; [[WhiteHairBlackHeart a white-haired young man is often evil]].

{{Subtrope}} of HairColors. When hair is ''depicted'' as an odd color, but is supposed to be a normal color (e.g., powder blue standing in for grey), that's HairColorDissonance. When the hair color is realistic but is not justified by the setting, that's ImplausibleHairColor.

See also {{Mukokuseki}} and AmazingTechnicolorPopulation. For characters with impossible hair ''styles'', see AnimeHair.

Often subject to PowerMakesYourHairGrow and might change color further as a result.
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!!Examples
[[index]]
* YouGottaHaveBlueHair/{{Anime}}
* YouGottaHaveBlueHair/{{Comics}}
* YouGottaHaveBlueHair/FanFic
* YouGottaHaveBlueHair/{{Film}}
* YouGottaHaveBlueHair/{{Literature}}
* YouGottaHaveBlueHair/LiveActionTV
* YouGottaHaveBlueHair/{{Music}}
* YouGottaHaveBlueHair/NewMedia
* YouGottaHaveBlueHair/ProfessionalWrestling
* YouGottaHaveBlueHair/TabletopGames
* YouGottaHaveBlueHair/VideoGames
* YouGottaHaveBlueHair/VisualNovels
* YouGottaHaveBlueHair/{{Webcomics}}
* YouGottaHaveBlueHair/WesternAnimation
[[/index]]

[[folder:Pinball]]
* In ''Pinball/BanzaiRun'', Blue Beard's hair is a ''very'' light electric blue.
[[/folder]]

[[folder:Web Original]]
* This is practically an EnforcedTrope among {{YouTube}}'s male British vloggers.
** This fact is even {{discussed}} and {{lampshaded}} on WebVideo/BecomingYouTube.
* In ''RolePlay/WeAreAllPokemonTrainers'', people are either born with or dye their hair spectacular colors.
* In ''Website/ClickHole''[='=]s "[[http://www.clickhole.com/quiz/heres-fucking-anime-quiz-754 Here's A Fucking Anime Quiz]]", the eighth question is, "What color hair do you have?" All the available answers are "Blue".
[[/folder]]

[[folder:Real Life]]
* The celebrated "Glowing Green Monkeys", who were created by gene-splicing lab monkeys with bioluminescent sea creatures. Their hair only glows under fluorescent light, however, and look more of a dull greenish-brown under normal conditions.
* A potential result of overexposure to cobalt or indigo dyes during industrial processes.
* Purple squirrels have been showing up around the world. Whether or not it's some sort of prank is unknown.
* Can be invoked using hair dye.
[[/folder]]
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