Humor is a god to me. If you can't make me laugh, it isn't going to work. Intellect is pretty high up there for me, as well. I tend to talk a lot, so it is much more enjoyable to do so with someone who can keep up and contribute to the conversation. ... Wow, that sounded rather arrogant, eh? I'm not nearly as egotistical as I come off, or at least I hope I'm not.
I'm not going to put anything more here because I greatly enjoy asking and answering questions with a person to get to know him/her better. You start.