A stranger in a dream rarely represents an actual unknown person -- more often it's a part of yourself you haven't recognized yet, or a quality you're growing into. Pay attention to how the stranger makes you feel: that reaction is usually the real message, more than anything they say or do.
The lord of the second house hath the same strength in hurting, as the lord of the eighth; the lord of the sixth, the same with the lord of the twelfth. - William Lilly (1602.-1681.)