I'm usually reserved and quiet until I'm comfortable with someone. Then my sense of humor comes out and I pepper the conversation with sarcastic/inappropriate/filthy jokes delivered in a (hopefully) dry manner.
I really don't have a type. I'd say I want someone cute, but I wouldn't know if a girl is cute unless I spent time with her, laughed with her, listened to her. Huge fan of girl next door/unconventional types. That's about as specific as I can get.