This is the playground for Devil Doll collecting images of Anime Characters with Neon-Colored Hair. (Most of these will be girls, occasionally a boy will be added if he fills the corresponding role.)
Rules: Image format = 120x120px JPG; entries ordered by anime number ascending.
Hair colors of Anime characters aren't just selected randomly. In some cases they express significant elements of that person's character (based on color symbolism in Japan). Note that by its very nature, this page may contain potential spoilers even though some characters won't exactly match the description here.
Brown HairNormal. Simple, persistent, comforting, traditional. (Japanese)
Yellow/Blonde HairTroublemaker. Naive, youthful, ditzy, playful/teasing, cynical, wealthy. (Gaijin)
Red HairHot head. Outspoken, energetic, passionate, stubborn, short-tempered, adventurous, aggressive. (Strong Fighter)
Blue HairShy. Calm, introverted, restrained, cool, dependable. Energetic when necessary. (May have hidden powers)
Green HairGood-natured. Tranquil, sometimes inconsiderate and vigorous, depending on luck/fate. (Outsider)
Purple HairIsolated. Smart and/or secretive. (Supporting characters.)
Grey/Silver HairPowerful. Dignified, skillful, intelligent, mysterious, arrogant. May not be human. (Force of Nature, Villain)
Orange HairEmotional. Full of energy and warmth, enthusiastic, seeking attention.
Black HairOccult. Dealing with the Supernatural, fighting demons. (Miko, Magic User, Fortune Teller)
Pink HairChildlike. Sickeningly cute and bubbly, naive, feminine, kind, innocent.
Animes making use of this hair color codeRules: Animes listed here ought to have female characters of at least five different hair color categories (hint: green often is the key to that). Use color order from above within each anime for better comparison, and insert anime by their number ascending.
 To Heart
 Shin Seiki Evangelion
 Love Hina
 Triangle Heart 3: Sweet Songs Forever
 Uchuu no Stellvia
 Wind: A Breath of Heart TV
 To Heart 2
 Kanon (2006)
 Tsuyokiss Cool X Sweet
 Nagasarete Airantou
 Kono Aozora ni Yakusoku wo
 Night Wizard
 Zero no Tsukaima: Princess no Rondo (combining all three seasons of the franchise)
 Hoshizora e Kakaru Hashi
 Yūsha ni Narenakatta Ore wa Shibushibu Shūshoku o Ketsui Shimashita
 Sekai de Ichiban Tsuyoku Naritai!