I like Norman. He seems like a messed up 9 with possible 4 fix. It's been a while though, since I watched Bates Motel. He could be INFP on mbti, at least.
Norma could possibly be IEI. I don't have any in-depth reasons for these as it's been several years since I watched the show.
I haven't watched the actual show beyond maybe 2 or 3 seasons, but I know the general direction it is heading in since I have watched Psycho. Anyways, here's a clip from the recent season (spoiler alert!):
It's possible he could be EII as well? 9 sp/sx?