"...its TV format should allow it to be more faithful than the original adaptations."

"In the Harry Potter book series, Severus Snape is described as a thin man with a large hooked nose, sallow skin, and greasy black hair."

"sal·low1

adjective

(of a person's face or complexion) of an unhealthy yellow or pale brown color.

Let's hire an attractive black man to play a waxy yellowish white man, that'll certainly be more true to the source material than the movies were.