"Her name escapes me, but there was an African American woman who played Madame Thenardier in Les Miz."
Her name was Fushia Walker, who later dropped the Walker part when she played Rafiki in Lion King on tour and can be seen on several TV commercials.
She was an intense Mme. Thenardier. but Eponine was still white, although being that Mr. Thenardier was also white it seemed possible.
For me the only issue I have is when it is a character that seems unbelievable in a period piece. Like Cornel John and Norm Lewis as Javert. Highly unlikely that there would be a black police man in France, let alone rise up the ranks of the force. Yes it is theatre and the whole thing requires some level of suspending belief, but still.
http://www.flickr.com/photos/27199361@N08/ Phantom at the Royal Empire Theatre