>Are those j/k-pop fan girls any hot or just kind of average in looks?
Those are young girls and teens, upperclass. And upperclass girls tend to dress little bit different etc. So it's a matter of taste. For me, they look better than average.
That's kind of disappointing that they're only teens who are into it. When you said in your first post that your girlfriend was really into the j/k-pop scene it sounded like she was at least college age.