Bailey is sweet and pretty and loved by all. If she's popular it's by accident, she doesn't seek the fame.
Parker is the kind of girl you don't mess with. She's tough and is either rich and hates it, or poor and doesn't care.
Julie is someone who's nice, but could be rather mean under the surface or just the opposite.
Kevin thinks he is all that or a complete nerd.
Adrian is the cute hunk that everyone wants to date.
You have
Kevin twice, but if they're different people then my two suggestions for the other
Kevin apply to this one as well.