Christina need to get staked or something. If its legal to kill the native population of a forest is it legal to kill the other contestants? Things could go all Lord of the Flies.
Paige seems very human. If she has freewill, can communate clearly, and doesn't eat people its a little boring. She also has regret for her actions when she does attack people. I can't imagine it will end up going well between her and Christina.
Ever play Planescape:Torment? It has a very well developed undead society. I can't imagine doing civilized undead better then that.
Vampires were good in Vampire the Masquerade:Bloodlines. Huge range of different characters in that game.
Have you ever tried writing bioware style dialog?