TONKS: will be searching for a way to defeat the monsters. She's not much of a researcher, but she'll probably talk to those who are in an attempt to sort things out. She'll help assist anyone who needs to go to Moody's.
SNAPE: Still needs to be injured, so anything there would be awesome. He's brewing stuff and helping the sick as best he can.
VICTOIRE: Still needs to die. She feels incredibly guilty about James' death, so maybe she does something incredibly stupid such as try to lead a monster away from the sick/injured pack, in a sort of twisted attempt to make amends?
MERLIN: Still needs to get sick. He'll be helping Wendelin when they're randomly attacked. But before that, he'll be throwing everything he's got, magically speaking, into figuring out how to defeat them. Everything has a weak spot, or so he figures.