I think the girl is the psycho, since she mercilessly and effortlessly kills zombies, the zombie is the lunatic, since he wants to live with the psycho girl and try to eat her despite knowing that and yes, the brother is the retard=)
at least that is how I think, but I could be wrong ╮( ̄▽ ̄)╭
So... which one is the psycho, the lunatic, and the retard?
The zombie is the psycho, the girl is the lunatic, and his brother is the retard?