A great interview with Don Cheadle: [link]
On The Magical Black Person:
"Although, there is a tendency with black characters in movies that they're either like the noble savage where they are everything and they can't make a mistake and they usually don't have a family or a love interest and they're perfect in every way and solve all the problems. They're the soul of the movie, they're the heart of the film.
"That shit kills me. 'Oh, he's the heart of the film!' Like, I don't want to do it. I don't need to be the heart of the film. I want to be the balls of the film."