It occurred to me while at work that...

The basic prototypes for all stereotypical characters are provided by the show Scooby-Doo

There's the brawny blond boy who thinks he's the leader of everything (oh he's so smug, that bastard); the sexy and maybe slutty pretty girl who's not good for much else except getting in the way; the hyper-intelligent nerdish bitch; the super-chill quickly-paranoid druggie

... and the dog that talks.