Okay I know this sounds shallow... but -
Lydia needs to comb her hair - somehow she is pretty, even with tattoos from her head to her toes, but she is just looking like a skank lately.
Michelle's nose drives me crazy - it's okay if she is loo
king straight into the camera, but if they get a side shot -

She makes me crazy - when she won POV she seemed to be happy the "cool people" liked her, even if it was just because of her power. She overestimates herself.
Chima reminds me of a transsexual. I don't know why, maybe it's the huge hair and overinflated lips. She went WAY too far during the fight, IMO.
Russell and Jesse are so into themselves! I don't get Russell - first he had a secret alliance with Ronnie, now he's taunting him. Jesse played it so cool during the fight, he started it and went to "rest" letting the house disintegrate!
Natalie looks like a little pit bull, or rooster - just wanting to get into it with someone. Anyone else notice she didn't say anything, during the fight, about the green room incident?
What's his name - one of "the girls'? I think he did chest-bump Ronnie in the fight - and he bugs me, he reminds me of a male Natalie, but he doesn't have a Jesse so he's a bit lost.
Ronnie - big geek, he turns on those crocodile tears easily
Jordan - I have seen some of that "popular group" behavior out of her - especially early in the game - and she still revels in others' misery. She always looks shocked, or surprised.
Jeff - would beat them all - he seems to be a nice guy, even trying to get Jordan to stay out of others' business. I haven't really seen negativity out of him.