What exactly is a Magic Negro?
According to Wikipedia:
The magical negro (sometimes called the mystical negro or magic negro) is a supporting, often mystical stock character in fiction who, by use of special insight or powers, helps the white protagonist get out of trouble. The word negro, now considered by many as archaic and offensive, is used intentionally to suggest that the archetype is a racist throwback, an update of the "Sambo" and "savage other" stereotypes.
The magical negro is typically but not always "in some way outwardly or inwardly disabled, either by discrimination, disability or social constraint," often a janitor or prisoner. He has no past; he simply appears one day to help the white protagonist. He sometimes fits the black stereotype, "prone to criminality and laziness." To counterbalance this, he has some sort of magical power, "rather vaguely defined but not the sort of thing one typically encounters." He is patient and wise, often dispensing various words of wisdom, and is "closer to the earth."