Natalia
So immature and conniving. There is something wrong with her. To me, she is never honest about what she actually is. During reunion, Mah Jing confronted her about her treatment of him during the competition, and she immediately used all the adjectives that came out of Mah Jing's mouth, and just threw them back at him ("Mah Jing has been nothing but rude and disrespectful to me since the beginning of the show" without giving specifics), the motive surely being, "I'm going to do whatever it takes to NOT lose this confrontation." Then when they were showing footage of Natalia's losing team challenge, where both Cornelius and Natalia were crying saying they would send themselves home (with Natalia saying "If you hate my jacket, you can send me home" after Cornelius said he would send himself home. So fake.), Alex says after everyone on his team had chosen the person to go home, that he would take the fall for the team, and Natalia says "The reason I was crying on stage is because Alex was basically sacrificing himself for the team," when she wasn't, since she was already crying when she was choosing herself to go home and feeling sorry for herself, and again only parroting the exact words Tim Gunn just used to describe the situation, and claiming them as her own.
She has some serious issues. Namely, self identity issues, and boundary issues. I imagine Borderline Personality Disorder looks something like this. What a nasty woman.