My favourite currently is Merida! I loved her movie, the message was wonderful, that there was no "prince" necessary which is finally a great message to be sending young girls!
I love Mulan for a very similar reason. She saved all of China, she didn't have to rely on a prince.
I can't stand Tangled and Rapunzel. I don't under why so many people call her a role model. She still relied on a man to get her out of her tower and blackmailed him into helping her. She would have been much more of a role model had she left the tower and even then come across Flynn. Had Flynn never come along, she would still be sitting in that tower!