Kirsty
Kirsty: GIRL MAIN fun, outgoing, pretty smart, not very girly, loves friends, lives for fun.
Heather
Heather: GIRL MAIN dumb, loveable, cute, sweet, Kirsty's best friend, boy-crazy, pretty girly, friendly.
Asher
Asher: BOY MAIN snobby, popular, rich, annoying, hot, the total popular jerk package.
Stella
Stella: GIRL MAIN slut, snobby, Kirsty's rival, popular, girly, gets everything she wants.
Brennan
Brennan: BOY MAIN (later in series) cute, charming, pretty smart, funny, Kirsty's crush.
Serena
Serena: GIRL MAIN (later in series) snobby, slut, Stella's sidekick kinda, girly, spreads a lot of rumors.
Alexandra "Alex"
Alex: GIRL MAIN (later in series) Kirsty's friend (later in series) fun, outgoing, not girly, funny, lives for party.
Keating
Keating: BOY MINOR popular, snobby, Stella's boyfriend.