PMSL kiz! I can so picture that! I agree with L as the cheeky schoolgirl as well. Quite naughty too, but in a loveable way?
I want to be something different in a TiBB school than I am in real life though! But I can't think - I'll get back to you.
You should make a list of all the personalities/groups you could have, and then try to think of the people that'd best suit them maybe!
(BTW Stacey would so be class clown. And Laura... agony aunt...hmm...)