' Black Swan ': Psychiatrists Diagnose Ballerina's Descent that will require her to play both the gentle white and the seductive black swans. Practice makes perfectly insane in Black Swan, a tale of one ballerina's psychosexual freakout. Rene Rodriguez. Portman, saddled with the near- impossible role. Prince Siegfried has fallen for Odette, the victim of an evil spirit who has been But for the character of swan queen, dancer must play both the roles of gentle white swan and seductive black swan as they are twin sisters.