The Green Mile.
Some examples of recent popular negros are:
Chef from South Park, Morgan Freeman, Oracle from the Matrix and Barack Obama.
Some non- black magical negros:
Mr. Miyagi, Jackie Chan, Pai Mei
Abraham: don' worry chile, im a wise ole sage heeuh tah help ya through alla yo struggles.
Hero: Thank you magical negro, I suddenly feel a lot better. See you at the end of the movie! (walks off to begin quest)
Abraham: crazy chile' (smiles and shakes head reminescing, then disappears in a cloud of smoke)
The "Magical Negro" character does not actually have to be of African-American decent, but is always the darkest member of the cast. The character's race is rarely if ever referred to, and usually speaks perfect English.
This plot device is beloved in Hollywood, because it allows producers and directors to say, "See? We're not racist! We have a minority in a featured role!"
Stephen King is especially well known for this device; see Scatman Crothers as 'Dick Halloran' in "The Shining" or Michael Clark Duncan as 'John Coffee' in "The Green Mile". See also Idris Alba as 'Heimdall' in "Thor" or Dev Patel as 'Zuko' in "The Last Airbender".