Fan Casting You Gotta Have Blue Hair in Sort by Tropes

Animation provides even more options than the typical blonde, red, and shades of brown and black. Western Animation has usually stuck to more natural colors, while occasionally using slight variations that work better in the medium; such as using dark blue or purple to highlight black hair, or using light blue instead of gray. Japanese Animation, however, has decided to use a far greater variety of hair colors than can be explained by nature.