[Mister-Darko]

7 boys, 7 girls

GIRLS:
2 bitchy plastic slags so they'll clash
A butch dyke
A sex mad, crazy, senile old woman.
A dumb blonde.
A loudmouth.. someone like Charley
A mole - someone to purposely cause arguments

GUYS:
A good looking guy WITH a personality
A dorky nerd
A sex addict
A hard man
A really camp gay guy
A straight acting gay in the closet
An insomniac so it won't be so boring at night

Just some ideas off the top of my head.