Usually, one would expect the extent of a work, especially a graphic novel, to reflect the physical characteristics of the inhabitants, except for some divergences. Manga is also an art form, notoriously influenced by Disney, that emphasizes to put it crudely, large eyes, big faces and childlike figures. But I have always noticed that in the majority of manga especially, one would see in either (1) the main love interest (2) The main protogonist (3) the main evil villain the prescence of extremely light hair and eyes. I wonder, why is it so?
Is this a reference to dying one’s hair, a sort of a fashion statement? is the person who’s potrayed making a daring fashion statement. Physical appearance is rarely unintentional. When a significant number of manga star blond haired blue eyed protagonists, there must be some dynamics to it. For example, every high school t.v. show in America has the blond haired cheerleader and a dark haired protagonist if he was a man. But I am not exactly sure why a land that is overwhelmingly dark haired and eyed stars so many light eyed and haired protagonists unless it might refer to a local dynamic: to a sort of implied character, perhaps wild, curious? The only characteristic that I remember light hair, for example, being associated with is innocence. Does blond hair connotate innocence or naivety?
Perhaps, it is a reflection on fashion trends. These are a bunch of Japanese popstars just from the top of my head and many of them have dyed hair.
Perhaps it just looks better and is more creative which is why we see many white haired villains. Or perhpas, since manga and anime is a bunch of wish fulfillment, it is a fantasy with all the things one would wish to have along with the ability to save the world.