Someone who loves me, accepts my strangeness (and maybe even encourages it), shares my interests, and is good at making choices. I'm not good at that. I'm not quite a submissive "tell me what to do" girl, but my default is to always try to accommodate. I'll entertain myself, but if someone else is around me, I want to do what makes them happy, and try to trust that they'll do the same for me.
Physically, I do have a preference for larger busts and black hair, but neither is vital. The closest I probably get to an actual requirement, physically, is more intimate shaving. Simply because I don't really care for the way it tickles me when I'm down there. Sexually, I go back to my desire for mutual accommodation. I have kinks that aren't the most usual. And while not required to enjoy intimacy, they do add something for me. But not when I have to ask for it. It's a mentality thing. I want someone who loves me enough to surprise me, and let me surprise her in turn (unless she is the domme type and wants to stay in control, which I'm also fine with to an extent. I want a partner, not a mistress, but I'll play the sub role situationally).