If I were to be a casting director, Id try to get the race of the fictional character correct. Black, white, Asian - accuracy would be key.
Nobody is going to look exactly like a cartoon character. And Unless you're equally worried with the specifics of the slope of Ariel's nose bridge, cheek bone height, space between eyes, etc; skin color is hardly an important feature to worry about. But if people were that anal about how much an actor looks like a cartoon character, pretty much every live-action movie based on a cartoon wouldn't exist. Now if somebody is more worried about skin color than say the differences between how Michael Keaton and Christian Bale look as Batman, they're just racist as fuck.
Unless race or demographics play an important role in the source material, there's no reason to worry about what race the actress is.
Cosplayers are able to stay true to a cartoon. But then they have more respect for the source material than Hollywood does. ---
"Well, it's not a bad game. It's made by Capcom, so how could it?" ~ AVGN