A mysteriously annoying woman with many talents.
I'm still on the fence about whether Charlotte can be trusted. But I prefer to (cautiously) give people in real life and TV life a chance to prove themselves, so I'm giving her the benefit of the doubt for now. Or at least to allow her the chance to redeem herself from the lousy first impressions that she's thrown off. So, my thoughts on her are:
1) Although I don't understand why Charlotte is so condescending and belligerent to the innocent stranded Losties, her attitude reminds me a lot of Zeke's attitude toward them at the "line in the sand" moment, when the Losties first met him in the jungle...i.e., treating them as if they purposely invaded their island territory. This could be due to the fact that she is connected somehow to the early Hanso or DHARMA influence, and she thinks of the Losties in terms of the way that she considers the Hostiles who infiltrated the original DI project.
2) Charlotte's knowledge of languages could mean anything, but in the most obvious terms her knowing Korean could link her to Paik. Although it could still mean she's connected to the early Hanso/DI projects. We know that the old Hanso careers website from TLE listed a few job openings which requested knowledge of multiple languages, including Asian ones, with the Anger Management position requiring Korean specifically. Although, something tells me that "Charlotte the Red" is not into anger management. Most simply, it could just mean that as a globe-trotting archaeologist/anthropologist, she's well-versed in languages. There does happen to be a Korean Archaeological Society. http://en.wikipedia.org/wiki/Korean_Archaeological_Society
3) There is the possibility that Charlotte is simply a bossy elitist academic who looks down on anyone who is not her equal, but somehow I get the feeling that it's more than that. Her arrogant deception is beyond belief, and Daniel seems to understand it while at the same time being annoyed by it. It could be that the F-4s themselves have been told things strictly on a need-to-know basis (which would make anyone cranky in this situation), they've been sworn to secrecy on what they do know about their mission, and most importantly they could have been told that all pay for their work is retracted if they tell the Losties anything about their mission. But that also leads to the thought that the F-4s have no idea that they have possibly been dumped permanently onto the island, much like Juliet, and any salary they think they're getting will not be spent back in the world any time soon.
I'm very interested in what other viewers think of Charlotte. Is there more there underneath her snarky exterior, or is what we see on the surface all there is with her? I hope that TPTB flesh her out a bit more than just as a cookie-cutter intellectual harpie. They may not though, considering how Rousseau just got killed without us knowing exactly why she was so crazy.