Lets see... I seriously doubt Grace, Elliot, Sarah, Susan, Justin, or Tedd will die. There still is the possibility that Ellen may die (we've been looking at the topic of her death since we met her (okay, not EXACTLY that long, but close enough))
In all actuality though, I think if Dan had to kill off one of the people in the current story line, he'd take Hedge. Why? Of the brothers, he's the one we've become the most enamoured of. His death would hit us much harder than the death of Guineas or Vlad. Not only that, but what would really become of him after the fighting is over? What would he, as a character, bring to the dynamics of the comic? I think that if Dan wanted to kick us in the stomach with the death of a character, Hedge would be it.
(okay, so i had an idea for Hedge's life after Painted Black. Hedge, Vlad, and Guineas get an apartment together and try to live normal lives even though they're all part animal and have no real experience in the outside world. It'd be funny in a Sit-com kinda way)