Thinking back to the girls I've been with over the years, they have very little in common. So I guess a 'type' isn't really right for me. What is true is that they were all girls that I could talk to openly as a friend first, which evolved into flirting and so on... in some cases this evolution occurred over an evening, in others over the course of a few weeks. In all cases they were girls with a personality that I got on with and were people I could talk to almost endlessly.
Looks wise they were very different, and also they all had very different interests, though at least some common ground with the things that I was interested in (one liked travel, another sport, another the same music etc.). They were all brunettes in my latter years, though I preferred red heads in my youth.