Since when were wide eyes a Caucasian feature???
in Japanese animation, skin color is not different from Japanese skin color. wide eyes are just an ideal they used to represent more variety of features. blond hair is not always the case. they also use all colors as a matter of fact. we see all anime with blue, purple and pink hair. in the earliest they used blond as to vary from black. for the sake of change. body-wise it has nothing to do with Caucasians (please don't say that large boobs and narrow waist is merely a Caucasian feature). the full lips are also not a typical Caucasian feature.
I'd say, they just created what seemed ideal. they took their skin color, mixed with wide eyes of Arabs, full lips of Africans, long straight hair from Indians, pointed noses from Caucasians. and came up with something they called ANIME.... for a reason!