I keep seeing these dark elf characters in manga and they're hardly ever dark-skinned, evil or repulsive, contrary to western fantasy. Instead, they're often seen as a bad omen, and they get persecuted and enslaved for no reason other than prejudice.
The more I think about the more it makes sense to me that authors see the 'dark' part and interpret it as a kuro gyaru archetype ('black' gals) - flashy delinquent-looking beauties who tend to be kind to otaku, at least in manga.