When INFP get under pressure the Te comes out and they use it like a blundgeon.
/readies bludgeon of Te for business meeting that's in 7 hours.
On a more serious note: the thing to remember about types in fiction is that although they may be mainly true to their "type," they still have to adhere to fourth-curtain considerations. (I.e., the fact they're made up people in a made-up world that exist for the story and the viewers, not themselves.) Would JD still be as lovable if he exploded in Te now & then? Probably not. So, in the show, he doesn't. In real life, he would. Scrubs is not real life. Therefore, JD can easily be an INFP even if certain things he does go directly against INFP-ism. Also therefore, I earn a Pepsi.
/goes to drink Pepsi after getting thirsty from exploding Te all over the place...
I made extra use of type relations when thinking of these. I now think they are pretty damn perfect. If one changes, then the whole relational map is fucked. I thought of it like one of those "who don it?" brain teasers with the relations.
1. JD is an I. He and elliot are very similar, yet she gets along with Cox worse. I conclude its the N. INFP vs ISFP when relating with ENTJ.
2. Cox and Jordan are both somewhat crazy. Both NTs. They cant stay together, but cant stay apart. Jordan more drives Cox insane then the other way around. They are one letter off. ENTJ and ENTP.
3. Karla and Turk. Turk is obviously ESFP. Karla could be ESFJ or ENFJ. Cox has had little bit of a crush on Karla before. Karla is much more likely to be ENFJ (ENTJs and ESFJs dont get along). ENFJ is also more likely to get along with ESFP because the ENFJ has that tertiary Se.
4. The janitor sometimes has what I would think are ENTP moments. In much the same way stewey (Family Guy) gets in control of situations, the janitor does too. Like when kelso goes to that conference and the janitor pretends to be the chief of Medicine. Very ENTP. Its a different ENTP than Jordan, but still ENTP. He likes to fuck with people, but its not in the ISTP way people are thinking.