White washing is what they did on the Avatar the last airbender movie, they turned Katara into a white girl, when her original look was ovbiously inspired by a native american northen tribe.
Expecting Nami to be a white red head is a natural wish, whitewashing or "racewashing" a character is bad
And this is comming from a a south american woman with light copper skin, I dont want nami to "look like me" to fit my personal wishes, i want her to look like Oda made her, Luffy is always portayed with slighty darker skin than her and Oda said he was from BR if he was born in real world? Ok get a latino looking Luffy its all right, Usopp was supposed to be from africa? Then ok get a black actor to play Usopp, its all chill.
Racewashing I think is racist too, and no, I dont agree all fishman should be black like the previous poster said, it sends kind of the wrong message, Fishman are fishman, and people should draw paralels with racism and discriminations from the things (injustices) that happen to them for being different, not the color of their skin