Hey!
Ok. Take in mind that it's a while since a watched the show but I try to bullshit myself through Karmas and Laurens types anyway x3
I'm pretty sure Karma is an ENFJ. Besides her seeming to contemplate a future with Amy alot, while solving problems she tries to fill the gaps with her intuition. For example, when she tries to become popular she doesn't look at what worked for other's and can therefore work for her (contrast that with Lauren who, I think, is an ESTJ) but she brings up her exact vision (Ni) (like she wants/ imagines things to be) and then takes action (Se). I guess that what
@thebigdragon sees as Ne? But she isn't random, she doesn't have sudden ideas that pop out of her mind coming from data of the past she has already gathered (Si). She wants something so she's trying to fill the gaps, take action, make her Ni visions come real. Make things real she wants for the future. Getting popular? Being Liams boyfriend? Sleeping with him? (Remember how she naturally imagined Amy to go away while the threesome the three of them planned? She didn't even tell her at first because she just took it as given! That was the only future she imagined. And she didn't even think that Amy could have envision another scenario so she was very surprised when she found out.)
Or... when Amy drove away and Karma said something like that maybe they would never be the same if Amy would leave. That was her Ni telling her this, too. 'When x happens y will happen.' She was so very sure that this could (or even would) ruin their friendship. That's my reasoning for her being all devastated about this. (Of course, Ni doesn't have to be right. Ni is very subjective and dependent on the information that was taken in with Se. Trust me, I know ^^')
Also, her approach to people is more Fe-Ni than Fe-Si, I'd say. She concentrates on expectations, characteristics and possible ways a person could turn out to be. (She sees Liam and whopps, he's her potential future boyfriend. She hears about the Amy-and-Liam-night and hey, her best friend just ISN'T this way so this has to mean Liam forced her to. She's this way, he's this way. Equals this scenario that can fill the gap. That's the deeper meaning of the night. This has to be Amys place and this is Liam's. The whole picture she had drawn about him in her mind changed. A new fact (Se) leads to a completely new abstraction/ vision(Ni).) These are more about abstractions than details. She doesn't concentrate on/ support things she learned in the past or the things her parents tried to teach her. She doesn't exactly rebell against her parent's way either even if she perceives herself as 'different' from them. Of course, she's sometimes quite ashamed of them (always thinking about society's values and putting herself in the shoes of possible audience) but she's just able to distance herself from this. It's easy for her to move on from the past, from the way she was raised because... that isn't her future anyway. It's not what she imagines herself to be, it's just not. Again, she doesn't REALLY realize her visions; there is no reason to actively go against her parents values, either. It's not so much that she wants to go against them, it's just that she subconsciously knows she isn't and will never be the way her parents are/ maybe want her to be. And that's fine.
Okay, let's contrast with Lauren. I'm actually a little bit surprised so many people typed her as an ENTJ (on other sites, too). For Lauren, the female archetype is quite important. It doesn't have to do with abstractions - conforming to the ideal of society's perfect female just for it to be so; that would be too abstract. That's rather what Karma would maybe do; conforming to abstract expectations because for her that would have value in itself. But nope. Lauren wants to be perfect in a very obvious way. She wants evidence for her being a 'well enough' female, a female who deserves her name. So, she dresses. She cares about things like this ridiculous cake I can't spell right now, cares about shopping and presenting as a female. That's why she's so excited to get along with Amys mother too - another way to prove that she's the perfect female, the perfect daughter - the perfect step daughter. She even better in doing this than Amy! Look, she proved herself!
And again and again.
Of course, being a Te-Dom, she doesn't quite reaches her goal (because society's 'perfect girl' is probably a Fe-Dom). But at least she's bitchy in a girly 'mean girls' kind of way
(But really, I love her.)
Okay, now. I mentioned a goal. 'Isn't that Ni????' No. Her goal isn't a vision she has while she projects her being in the future - like Karma does, and even to an extension Amy does. It's, of course, firstly efficiency. Te. Whatever she does, she does it in a very 'hard logic' kind of way. Okay, let's think about what it is that she wants: Be the perfect daughter/ step daughter. Win the Miss blabla. Be school president. Be in that college.
So. Why does she want to do that? Again, it isn't because she imagines herself to be that way and only that way in the future, no. These are things that were thousand times done by other people, by successful people. If she reaches that goal she is a step closer on being like these people. But she doesn't exactly have an end goal; anything she really strives to reach for. Or, in other words, she doesn't have a vision. She thinks about what would be useful to accomplish, then she works out a very detailed, down-to-earth plan she can reach the goal with (Si) and THEN uses her Ne to be a little extra creative and glamorous. Then she allows herself to dream a little bit. When the work is done.
But there is no overall goal. There are just these little steps. She knows she wants to be successful but she doesn't really think about in which way; because that would limit her choices anyway and therefore would maybe take the most efficient choice away, so why should she limit herself? (That's, again, Ne.)
Last but not least, she very much concentrates on the values that are important to her because of her past, of her body, of facts. She can't let loose from being an intersexual because she is. It was hard to seperate herself from her fathers values because his values became her's, and that's just how it always was. Because these are just the (subjective) facts, right?
She couldn't let go of the 'facts' - for a very long time.
The new high school and the students in there taught her to see new possibilities, to question the supposedly 'facts' that were given to her.