We've all gotten used to unusual hair colors in anime and comic books. After all, it makes total sense for a powerful superhero or a Hot-Blooded mecha pilot to have pink or green hair, right? Well, this is something different.
This trope is about completely normal, just-like-our-everyday-lives series where people nonetheless have unnatural hair colors - and occasionally, styles. Expect nobody to mention or comment on its unnaturalness, particularly if it's a manga or anime.
You Gotta Have Blue Hair
is the supertrope of this trope.