I like a girl who likes me for who I am, who accepts me and enjoys hearing the lamest stories. I have to find her attractive and she has to be smart, as I am a fairly intellectual person (I work in research) so she has to appeciate the work that I do. Most of all I have to feel comfortable with her.
I think it's really cute when a girl just plays along with my games without me telling her. She should strive to actualize herself and be more than the a cookie-cut of what is portrayed in the media. She should find what she is passionate about and reach for it. A sense of humor is a plus. If she's too uptight, that's a no-go. As fas as her physicality goes, a bit of confidence is a lot more appealing than genetic attractiveness.