I recently started watching this show. Actually, I started watching it when it first premiered, but I lost interest after the first few episodes. But everyone kept telling me that it got a lot better after I stopped watching it, and sure enough, it did. Literally the next episode was so much better, and then it kept getting better. It's becoming one of my favorite shows.

Anyway, these are my best guesses for the characters' types. But of course, I haven't seen all the episodes yet.

Coulson: ISFJ
Ward: IxTJ (not sure yet)
Skye: ENFP
Fitz: INTP
Simmons: INxJ (again, not sure about her. She's very scientifically minded, but also seems to have a strongly developed Fe. I can't figure her out.)

Agree/disagree? Other theories?