Physically I look girls that are shorter than me and at least as thin. I also dig punk, emo, or any kind of deviant look. I'm also a fan of green eyes and eye shadow.
Personality wise, it depends. I think that most people have a personality that's appealing in some way. I'd like a girl that has the same interests as me though. Someone easygoing that will smoke with me and likes metal and not make a huge fucking deal out of things that don't matter like most girls do.
I don't really have a lot of physical preferences for guys but I like them to be fit. For personality I usually fall for guys that are assertive, fun, and tease me a lot.