Amazing movie. Natalie Portman should win an Oscar for her role as Nina.
Nina - EII (INFj). Soft spoken, serious, delicate, hard worker, & a perfectionist. She has the perfect demeanor to play the White Swan, but has a incredible difficulty molding into character for the Black Swan. It's interesting to see how much she struggles & develops internal conflicts mostly centered around her Se PoLR throughout the movie.
Lily - SEE (ESFp) or SLE (ESTp). Wild, free spirited & pushy. Extroverted, irrational, ego.
Thomas Leroy - Beta extrovert. Probably SLE (ESTp).
Ninas mother - ESI? Not sure. Rational for sure.