Chantal, as she has a fascination for macabre shit and true crime. She'd do a really disturbing "tee hee!" laugh as soon as she said it, and Nick would do one of those faggy shrieklaughs in response.
Chantal, Jen, Amber, and Nick vote for Amy, because even in that rotten company, and despite whatever grudges there may be, Amy is the loudest, and most annoyingly stupid, offensive, and deranged.
Kelly will want to vote for Nick because he's a white, able-bodied male and therefore an oppressor, but she's also a parasite and will know that attaching herself to him is her best chance of survival. And she can't vote for Amy, because Muslims are victims of oppression. So she votes for Chantal, as the smallest, most-ambulatory, and therefore least oppressed of the remaining women (conveniently ignoring that Kelly herself is the smallest and thus least-oppressed fatgirl in the bunch).
Nick. As a male who only started wrecking himself with food and packing on weight in adulthood, he still has the most lean muscle mass by far, and would provide the most protein. Unless, of course, they all decided to do radical keto and subsist on nothing but blubber, in which case...Jen. She has the highest blubber yield, and arguably the least shitty diet (since she doesn't have the means to do chain restaurant/fast food binges), so the quality of that blubber might be a tad better.