I love this show. It's so relevant and complex and fresh. Highly recommended to anyone and everyone.
Warning: these are pretty blind guesses, mostly hunches. Would love to hear more opinions!
Piper: xNFx? Maybe ENFP?
Alex: ENTP? ESTP?
Red: ESTJ, possibly?
Pornstache: ESTP, though more of a stereo/archetype than anything else.
Yoga Jones: ISFP.