I posted a while back on the concept that people in my generation were undeniably impacted by the Teenage Mutant Ninja Turtles. Whether boy or girl, those born in the late 70's through the early 90's have a deep connection to the heros in a half shell.
I do not know whether there is a psychological study out there, but I know I'm right on this: the Turtle you relate to the best is usually the type of person that you want to be or thought you were. Look at the four personalities, and tell me what you think:
Leonardo: Leader, calm & cool
Rafael: sarcastic & tough
Michelangelo: party animal
Donatello: smart & nerdy