Lil devils x said:
It isn't Ariel's hair, eye or skin color that makes Ariel ( besides they use wigs and contacts anyways), it is the way she carries herself, her voice, her charisma, her energy, her manner and I think Halle fits perfectly into that role. Ariel does not have some racial history or past that would factor in to her tan or culture being a factor in her character more so than her personality.
That's a touchingly optimistic explanation (some would say naive). I'm sure she's a fantastic actress and will do a great job in the role, but the fact remains somebody (well, a whole boardroom of somebodies) made the decision to cast a black girl in the role of Ariel. Not a black person. Not a girl of colour. This was a thought-out, planned decision that, like all Disney releases, has more to do with marketing than artistic vision.
I'm not saying it couldn't possibly work, and please believe me when I say I'm really not that opposed to the idea of black mermaids. They're fictional creatures, as has been pointed out by everyone. But it's a change that sets off a chain of dominoes within the established story. If Ariel is black, then naturally Triton is black too. Will Prince Eric be black, or are Disney finally ready to "go there" in terms of depicting an interracial love story? I actually kind of hope they have the cajones to do that, not simply black-wash the entire movie because it would be easier for audiences to swallow.