Redhair as a sign of otherworldliness
In the early 1600ís, at the end of the reign of Queen Elizabeth I, the belief of Pixies (aka fairies) emerged in southwest England. They were then and have since been strongly associated with red hair for their mischievousness and otherworldly talents. In fiction the character isn't necessarily magic, but might be strongly associated with unnatural forces. A magic using group of any kind might be entirely made up of redheaded creatures to give off an eerie feeling like the Eerie Pale-Skinned Brunette does. It animation it tends to be a mystical carrot-top or orange haired character. If the character does do magic and the red hair is a sign that he's intimidatingly powerful then he's a Great Redheaded Sorcerer (still in YKTTW). For other "magical" minorities, see Magical Negro, Heroic Albino, Disability Superpower. Compare Red-Headed Stepchild.